git.efficios.com Git - deliverable/linux.git/log

Merge branches 'amba', 'fixes', 'misc' and 'tauros2' into for-next

ARM: 8546/1: dma-mapping: refactor to fix coherent+cma+gfp=0

Given a device which uses arm_coherent_dma_ops and on which
dev_get_cma_area(dev) returns non-NULL, the following usage of the DMA
API with gfp=0 results in memory corruption and a memory leak.

p = dma_alloc_coherent(dev, sz, &dma, 0);
if (p)
dma_free_coherent(dev, sz, p, dma);

The memory leak is because the alloc allocates using
__alloc_simple_buffer() but the free attempts
dma_release_from_contiguous() which does not do free anything since the
page is not in the CMA area.

The memory corruption is because the free calls __dma_remap() on a page
which is backed by only first level page tables. The
apply_to_page_range() + __dma_update_pte() loop ends up interpreting the
section mapping as an addresses to a second level page table and writing
the new PTE to memory which is not used by page tables.

We don't have access to the GFP flags used for allocation in the free
function. Fix this by adding allocator backends and using this
information in the free function so that we always use the correct
release routine.

Fixes: 21caf3a7 ("ARM: 8398/1: arm DMA: Fix allocation from CMA for coherent DMA")
Signed-off-by: Rabin Vincent <rabin.vincent@axis.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8547/1: dma-mapping: store buffer information

Keep a list of allocated DMA buffers so that we can store metadata in
alloc() which we later need in free().

Signed-off-by: Rabin Vincent <rabin.vincent@axis.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8544/1: set_memory_xx fixes

Allow zero size updates. This makes set_memory_xx() consistent with x86, s390 and arm64 and makes apply_to_page_range() not to BUG() when loading modules.

Signed-off-by: Mika Penttilä mika.penttila@nextfour.com
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8543/1: decompressor: rename suffix_y to compress-y

The "$(suffix_y)" no longer appears in the file names, but it just
specifies the method of the file compression. The "compress-y" sounds
more suitable.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8542/1: decompressor: merge piggy.*.S and simplify Makefile

The files piggy.$(suffix).S are similar enough to be merged into a
single file. This also allows clean up of the Makefile.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8541/1: decompressor: drop redundant FORCE in Makefile

The object "piggy.$(suffix_y).o" is created from "piggy.$(suffix).S"
by the following pattern rule defined in scripts/Makefile.build:

$(obj)/%.o: $(src)/%.S FORCE
$(call if_changed_dep,as_o_S)

FORCE is already added to the prerequisite of the object there.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8540/1: decompressor: use clean-files instead of extra-y to clean files

This code works fine here, but it is tricky to use "extra-y" for
specifying files to be removed during "make clean". Kbuild provides
"clean-files" for this purpose.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8539/1: decompressor: drop more unneeded assignments to "targets"

The objects "font.o" and "misc.o" are contained in $(OBJS), and it
is already added to the "targets".

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8538/1: decompressor: drop unneeded assignments to "targets"

The "targets" exists to specify which files need the corresponding
".*_cmd" files to be included during the build.  In other words, it
is used for files that need to detect the change of the command line
by if_changed, if_changed_dep, and if_changed_rule.  While, these
files are just copied by "$(call cmd,shipped)".  Adding them to the
"targets" is meaningless because $(call cmd,...) never creates
".*_cmd" files.  Such files as ".lib1funcs.S.cmd", ".ashldi3.S.cmd"
do not exist in the first place.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8532/1: uncompress: mark putc as inline

When CONFIG_DEBUG_ICEDCC is set, we don't use the platform
specific putc() function, but use icedcc_putc() instead, so
putc is unused and causes a compile time warning:

In file included from ../arch/arm/boot/compressed/misc.c:28:0:
arch/arm/mach-rpc/include/mach/uncompress.h:79:13: warning: 'putc' defined but not used [-Wunused-function]
arch/arm/mach-w90x900/include/mach/uncompress.h:30:13: warning: 'putc' defined but not used [-Wunused-function]

On most platforms, this does not happen, because putc is defined
as 'static inline' so the compiler will automatically drop it
when it's unused.

This changes the remaining seven platforms to behave the same way.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8531/1: turn init_new_context into an inline function

Almost all architectures define init_new_context() as a function,
but on ARM, it's a macro and that causes a compiler warning when
its return code is not used:

drivers/firmware/efi/arm-runtime.c: In function 'efi_virtmap_init':
arch/arm/include/asm/mmu_context.h:88:34: warning: statement with no effect [-Wunused-value]
#define init_new_context(tsk,mm) 0
drivers/firmware/efi/arm-runtime.c:47:2: note: in expansion of macro 'init_new_context'
init_new_context(NULL, &efi_mm);

This changes the definition into an inline function, which gcc does
not warn about.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8530/1: remove VIRT_TO_BUS

All drivers that are relevant for rpc or footbridge have stopped
using virt_to_bus a while ago, so we can remove it and avoid some
harmless randconfig warnings for drivers that we do not care about:

drivers/atm/zatm.c: In function 'poll_rx':
drivers/atm/zatm.c:401:18: warning: 'bus_to_virt' is deprecated [-Wdeprecated-declarations]
   skb = ((struct rx_buffer_head *) bus_to_virt(here[2]))->skb;

FWIW, the remaining drivers using this are:

ATM:  firestream, zatm, ambassador, horizon
ISDN: hisax/netjet
V4L:  STA2X11, zoran
Net:  Appletalk LTPC, Tulip DE4x5, Toshiba IrDA
WAN:  comtrol sv11, cosa, lanmedia, sealevel
SCSI: DPT_I2O, buslogic
VME:  CA91C142

My best guess is that all of the above are so hopelessly obsolete that
we are best off removing all of them form the kernel, but that can be
done another time.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8537/1: drop unused DEBUG_RODATA from XIP_KERNEL

With CONFIG_DEBUG_RODATA not being sensible under XIP_KERNEL, remove it
from the XIP linker script.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8536/1: mm: hide __start_rodata_section_aligned for non-debug builds

The __start_rodata_section_aligned is only referenced by the
DEBUG_RODATA code, which is only used when the MMU is enabled,
but the definition fails on !MMU builds:

arch/arm/kernel/vmlinux.lds:702: undefined symbol `SECTION_SHIFT' referenced in expression

This hides the symbol whenever DEBUG_RODATA is disabled.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 64ac2e74f0b2 ("ARM: 8502/1: mm: mark section-aligned portion of rodata NX")
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8535/1: mm: DEBUG_RODATA makes no sense with XIP_KERNEL

When CONFIG_DEBUG_ALIGN_RODATA is set, we get a link error:

arch/arm/mm/built-in.o:(.data+0x4bc): undefined reference to `__start_rodata_section_aligned'

However, this combination is useless, as XIP_KERNEL implies that all the
RODATA is already marked readonly, so both CONFIG_DEBUG_RODATA and
CONFIG_DEBUG_ALIGN_RODATA (which depends on the other) are not
needed with XIP_KERNEL, and this patches enforces that using a Kconfig
dependency.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 25362dc496ed ("ARM: 8501/1: mm: flip priority of CONFIG_DEBUG_RODATA")
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8534/1: virt: fix hyp-stub build for pre-ARMv7 CPUs

ARMv6 CPUs do not have virtualisation extensions, but hyp-stub.S is
still included into the image to keep it generic. In order to use ARMv7
instructions during HYP initialisation, add -march=armv7-a flag to
hyp-stub's build.

On an ARMv6 CPU, __hyp_stub_install returns as soon as it detects that
the mode isn't HYP, so we will never reach those instructions.

Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: make the physical-relative calculation more obvious

The physical-relative calculation between the XIP text and data sections
introduced by the previous patch was far from obvious. Let's simplify it
by turning it into a macro which takes the two (virtual) addresses.

This allows us to arrange the calculation in a more obvious manner - we
can make it two sub-expressions which calculate the physical address for
each symbol, and then takes the difference of those physical addresses.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8512/1: proc-v7.S: Adjust stack address when XIP_KERNEL

When XIP_KERNEL is enabled, the virt to phys address translation for RAM
is not the same as the virt to phys address translation for .text.
The only way to know where physical RAM is located is to use
PLAT_PHYS_OFFSET.
The MACRO will be useful for other places where there is a similar problem.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Chris Brandt <chris.brandt@renesas.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8411/1: Add default SPARSEMEM settings

We can still override these settings via mach/memory.h, but let's provide
sensible defaults so that SPARSEMEM is available in the multiplatform
kernels.

Two platforms currently use SECTION_SIZE_BITS < 28, but are expected to
work with 28 (albeit slightly less efficiently if not all banks are
populated):

- mach-rpc: uses 26 bits.  Based on mach/hardware.h it looks like this
   platform puts RAM at 0x1000_0000 - 0x1fff_ffff, and I/O below
   0x1000_0000.

- mach-sa1100: uses 27 bits.  mach/memory.h indicates that RAM occupies
   the entire range of 0xc000_0000 - 0xdfff_ffff.

But Arnd says in that rpc and sa1100 will never have to use the
default since they cannot be part of a multiplatform kernel, and that
is unlikely to change.

Several platforms need MAX_PHYSMEM_BITS >= 36 so we'll pick that as the
minimum.  Anything higher and we'll fail the SECTIONS_WIDTH + NODES_WIDTH +
ZONES_WIDTH test in <linux/mm.h>.

Some analysis from Russell King at
http://lists.infradead.org/pipermail/linux-arm-kernel/2014-October/298957.html:

  I think this is fine in as far as it goes - this means we end up with
  256 entries in the mem_section array which means it occupies one page,
  which I think is acceptable overhead.

  The other thing to be aware of here is the obvious:

  #if (MAX_ORDER - 1 + PAGE_SHIFT) > SECTION_SIZE_BITS
  #error Allocator MAX_ORDER exceeds SECTION_SIZE
  #endif

  Which means that with 28 bits of section, that's a maximum allocator
  order of 16.  We appear to allow FORCE_MAX_ZONEORDER to be set up to
  64 in the case of shmobile, which doesn't seem like a sensible upper
  limit - and certainly isn't when sparsemem is enabled.

  Given this, I think that FORCE_MAX_ZONEORDER's help, and the
  dependencies probably could do with some improvement to make the
  issues more transparent.

[gregory.0xf0: added notes from Arnd and Russell]

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Gregory Fong <gregory.0xf0@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8503/1: clk_register_clkdev: remove format string interface

Many callers either use NULL or const strings for the third argument of
clk_register_clkdev. For those that do not and use a non-const string,
this is a risk for format strings being accidentally processed (for
example in device names). As this interface is already used as if it
weren't a format string (prints nothing when NULL), and there are zero
users of the format strings, remove the format string interface to make
sure format strings will not leak into the clkdev.

$ git grep '\bclk_register_clkdev\b' | grep % | wc -l
0

Unfortunately, all the internals expect a va_list even though they treat
a NULL format string as special. To deal with this, we must pass either
(..., "%s", string) or (..., NULL) so that a the va_list will be created
correctly (passing the name as an argument, not as a format string).

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8529/1: remove 'i' and 'zi' targets

These two targets were introduced by commit 13d5fadf45d1 ("[ARM]
Make 'i' and 'zi' targets work") to short-circuit the dependencies
for 'install' and 'zinstall'.

After that, commit 19514fc665ff ('arm, kbuild: make "make install"
not depend on vmlinux') eventually made "(z)install" equivalent to
"(z)i".

It is true that 'i' and 'zi' might be still useful as shorthands
but the original intention had been already lost.

They do not even show up in "make ARCH=arm help", so I hope this
deletion does not have much impact.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8528/1: drop redundant "PHONY += FORCE"

"PHONY += FORCE" is already cared by scripts/Makefile.build,
which this file is included from.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8527/1: virt: enable GICv3 system registers

ARMv8 introduces system registers for the Generic Interrupt Controllers
CPU and virtual interfaces. When GICv3 is implemented, EL2 needs to
allow the kernel to use those registers, by changing the value of
ICC_HSRE.

Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8524/1: driver cohandle -EPROBE_DEFER from bus_type.match()

Allow implementations of the match() callback in struct bus_type to
return errors and if it's -EPROBE_DEFER then queue the device for
deferred probing.

This is useful to buses such as AMBA in which devices are registered
before their matching information can be retrieved from the HW
(typically because a clock driver hasn't probed yet).

[changed if-else code structure, adjusted documentation to match the code,
extended comments]

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8523/1: sa1111: ensure no negative value gets returned on positive match

This patch ensures that existing bus match callbacks don't return
negative values (which might be interpreted as potential errors in the
future) in case of positive match.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8522/1: drivers: nvdimm: ensure no negative value gets returned on positive match

This patch ensures that existing bus match callbacks don't return
negative values (which might be interpreted as potential errors in the
future) in case of positive match.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

Linux 4.5-rc4

Merge tag 'char-misc-4.5-rc4' of git://git./linux/kernel/git/gregkh/char-misc

Pull char/misc driver fixes from Greg KH:
"Here are 3 fixes for some reported issues.  Two nvmem driver fixes,
  and one mei fix.  All have been in linux-next just fine"

* tag 'char-misc-4.5-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  nvmem: qfprom: Specify LE device endianness
  nvmem: core: return error for non word aligned access
  mei: validate request value in client notify request ioctl

Merge tag 'driver-core-4.5-rc4' of git://git./linux/kernel/git/gregkh/driver-core

Pull driver core fix from Greg KH:
"Here is one driver core, well klist, fix for 4.5-rc4.

  It fixes a problem found in the scsi device list traversal that
  probably also could be triggered by other subsystems.

  The fix has been in linux-next for a while with no reported problems"

* tag 'driver-core-4.5-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  klist: fix starting point removed bug in klist iterators

Merge tag 'tty-4.5-rc4' of git://git./linux/kernel/git/gregkh/tty

Pull tty/serial fixes from Greg KH:
"Here are a number of small tty and serial driver fixes for 4.5-rc4
  that resolve some reported issues.

  One of them got reverted as it wasn't correct based on testing, and
  all have been in linux-next for a while"

* tag 'tty-4.5-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  Revert "8250: uniphier: allow modular build with 8250 console"
  pty: make sure super_block is still valid in final /dev/tty close
  pty: fix possible use after free of tty->driver_data
  tty: Add support for PCIe WCH382 2S multi-IO card
  serial/omap: mark wait_for_xmitr as __maybe_unused
  serial: omap: Prevent DoS using unprivileged ioctl(TIOCSRS485)
  8250: uniphier: allow modular build with 8250 console
  tty: Drop krefs for interrupted tty lock

Merge tag 'usb-4.5-rc4' of git://git./linux/kernel/git/gregkh/usb

Pull PHY fixes from Greg KH:
"Here are a couple of PHY driver fixes for 4.5-rc4.

  A few small phy issues.  All have been in linux-next with no reported
  issues"

* tag 'usb-4.5-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
  phy: twl4030-usb: Fix unbalanced pm_runtime_enable on module reload
  phy: twl4030-usb: Relase usb phy on unload
  phy: core: fix wrong err handle for phy_power_on
  phy: Restrict phy-hi6220-usb to HiSilicon arm64

Merge branch 'perf-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull perf tooling fixes from Thomas Gleixner:
"Another round of fixes for the perf tooling side:

   - Prevent a NULL pointer dereference in tracepoint error handling

   - Fix a thread handling bug in the intel_pt error handling code

   - Search both .eh_frame and .debug_frame sections as toolchains seem
     to have random choices of storing the CFI information

   - Fix the perf state interval output values, which got broken when
     fixing the overall output"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf stat: Fix interval output values
  perf probe: Search both .eh_frame and .debug_frame sections for probe location
  perf tools: Fix thread lifetime related segfaut in intel_pt
  perf tools: tracepoint_error() can receive e=NULL, robustify it

Merge branch 'locking-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull lockdep fix from Thomas Gleixner:
"A single fix for the stack trace caching logic in lockdep, where the
duplicate avoidance managed to store no back trace at all"

* 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
locking/lockdep: Fix stack trace caching logic

Merge branch 'timers-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull timer fix from Thomas Gleixner:
"A single fix preventing a 32bit overflow in timespec/val to cputime
conversions on 32bit machines"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
cputime: Prevent 32bit overflow in time[val|spec]_to_cputime()

Merge branch 'irq-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull irqchip fixes from Thomas Gleixner:
"Another set of ARM SoC related irqchip fixes:
   - Plug a memory leak in gicv3-its
   - Limit features to the root gic interrupt controller
   - Add a missing barrier in the gic-v3 IAR access
   - Another compile test fix for sun4i"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/gic-v3: Make sure read from ICC_IAR1_EL1 is visible on redestributor
  irqchip/gic: Only set the EOImodeNS bit for the root controller
  irqchip/gic: Only populate set_affinity for the root controller
  irqchip/gicv3-its: Fix memory leak in its_free_tables()
  irqchip/sun4i: Fix compilation outside of arch/arm

Merge branch 'x86-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull x86 fixes from Thomas Gleixner:
"Two small fixlets for x86:

   - Prevent a KASAN false positive in thread_saved_pc()

   - Fix a 32-bit truncation problem in the x86 numa code"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mm/numa: Fix 32-bit memblock range truncation bug on 32-bit NUMA kernels
  x86: Fix KASAN false positives in thread_saved_pc()

Merge branch 'upstream' of git://git.linux-mips.org/ralf/upstream-linus

Pull MIPS fixes from Ralf Baechle:
"Here's the first round of MIPS fixes after the merge window:

   - Detect Octeon III's PCI correctly.
   - Fix return value of the MT7620 probing function.
   - Wire up the copy_file_range syscall.
   - Fix 64k page support on 32 bit kernels.
   - Fix the early Coherency Manager probe.
   - Allow only hardware-supported page sizes to be selected for R6000.
   - Fix corner cases for the RDHWR nstruction emulation on old hardware.
   - Fix FPU handling corner cases.
   - Remove stale entry for BCM33xx from the MAINTAINERS file.
   - 32 and 64 bit ELF headers are different, handle them correctly"

* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
  mips: Differentiate between 32 and 64 bit ELF header
  MIPS: Octeon: Update OCTEON_FEATURE_PCIE for Octeon III
  MIPS: pci-mt7620: Fix return value check in mt7620_pci_probe()
  MIPS: Fix early CM probing
  MIPS: Wire up copy_file_range syscall.
  MIPS: Fix 64k page support for 32 bit kernels.
  MIPS: R6000: Don't allow 64k pages for R6000.
  MIPS: traps.c: Correct microMIPS RDHWR emulation
  MIPS: traps.c: Don't emulate RDHWR in the CpU #0 exception handler
  MAINTAINERS: Remove stale entry for BCM33xx chips
  MIPS: Fix FPU disable with preemption
  MIPS: Properly disable FPU in start_thread()
  MIPS: Fix buffer overflow in syscall_get_arguments()

Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm

Pull ARM fixes from Russell King:
"A couple of ARM fixes from Linus for the ICST clock generator code"

[ "Linus" here is Linus Walleij.  Name-stealer.

       Linus "there can be only one" Torvalds ]

* 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm:
  ARM: 8519/1: ICST: try other dividends than 1
  ARM: 8517/1: ICST: avoid arithmetic overflow in icst_hz()

Merge branch 'component' of git://ftp.arm.linux.org.uk/~rmk/linux-arm

Pull component helper fixes from Russell King:
"A few fixes for problems people have encountered with the recent
  update to the component helpers"

* 'component' of git://ftp.arm.linux.org.uk/~rmk/linux-arm:
  component: remove device from master match list on failed add
  component: Detach components when deleting master struct
  component: fix crash on x86_64 with hda audio drivers

Merge tag 'for-linus' of git://git./linux/kernel/git/dledford/rdma

Pull more rdma fixes from Doug Ledford:
"I think we are getting pretty close to done now.  There are four
  one-off fixes in this update:

   - fix ipoib multicast joins
   - fix mlx4 error handling
   - fix mlx5 size computation
   - fix a thinko in core code"

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma:
  IB/mlx5: Fix RC transport send queue overhead computation
  IB/ipoib: fix for rare multicast join race condition
  IB/core: Fix reading capability mask of the port info class
  net/mlx4: fix some error handling in mlx4_multi_func_init()

Merge git://git./linux/kernel/git/nab/target-pending

Pull SCSI target fixes from Nicholas Bellinger:
"This includes the long awaited series to address a set of bugs around
  active I/O remote-port LUN_RESET, as well as properly handling this
  same case with concurrent fabric driver session disconnect ->
  reconnect.

  Note this set of LUN_RESET bug-fixes has been surviving extended
  testing on both v4.5-rc1 and v3.14.y code over the last weeks, and is
  CC'ed for stable as it's something folks using multiple ESX connected
  hosts with slow backends can certainly trigger.

  The highlights also include:

   - Fix WRITE_SAME/DISCARD emulation 4k sector conversion in
     target/iblock (Mike Christie)

   - Fix TMR abort interaction and AIO type TMR response in qla2xxx
     target (Quinn Tran + Swapnil Nagle)

   - Fix >= v3.17 stale descriptor pointer regression in qla2xxx target
     (Quinn Tran)

   - Fix >= v4.5-rc1 return regression with unmap_zeros_data_store new
     configfs store handler (nab)

   - Add CPU affinity flag + convert qla2xxx to use bit (Quinn + HCH +
     Bart)"

* git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending:
  qla2xxx: use TARGET_SCF_USE_CPUID flag to indiate CPU Affinity
  target/transport: add flag to indicate CPU Affinity is observed
  target: Fix incorrect unmap_zeroes_data_store return
  qla2xxx: Use ATIO type to send correct tmr response
  qla2xxx: Fix stale pointer access.
  target/user: Fix cast from pointer to phys_addr_t
  target: Drop legacy se_cmd->task_stop_comp + REQUEST_STOP usage
  target: Fix race with SCF_SEND_DELAYED_TAS handling
  target: Fix remote-port TMR ABORT + se_cmd fabric stop
  target: Fix TAS handling for multi-session se_node_acls
  target: Fix LUN_RESET active TMR descriptor handling
  target: Fix LUN_RESET active I/O handling for ACK_KREF
  qla2xxx: Fix TMR ABORT interaction issue between qla2xxx and TCM
  qla2xxx: Fix warning reported by static checker
  target: Fix WRITE_SAME/DISCARD conversion to linux 512b sectors

Merge branch 'fixes' of git://git./linux/kernel/git/evalenti/linux-soc-thermal

Pull thermal management fixes from Eduardo Valentin:
"Specifics in this pull request:

   - Compilation fixes on SPEAR, and U8500 thermal drivers.
   - RCAR thermal driver now recognizes OF-thermal based thermal zones.
   - Small code rework on OF-thermal.
   - These change have been CI tested using KernelCI bot [1,2].  \o/

  I am taking over on Rui's behalf while he is out.  Happy New Chinese
  Year!

  [1] - https://kernelci.org/build/evalenti/kernel/v4.5-rc3-16-ga53b8394ec3c/
  [2] - https://kernelci.org/boot/all/job/evalenti/kernel/v4.5-rc3-16-ga53b8394ec3c/"

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal:
  thermal: cpu_cooling: fix out of bounds access in time_in_idle
  thermal: allow u8500-thermal driver to be a module
  thermal: allow spear-thermal driver to be a module
  thermal: spear: use __maybe_unused for PM functions
  thermal: rcar: enable to use thermal-zone on DT
  thermal: of: use for_each_available_child_of_node for child iterator

Merge tag 'sound-fix-4.5-rc4' of git://git./linux/kernel/git/tiwai/sound

Pull another sound fix from Takashi Iwai:
"This contains a fix for the double-free of usb-audio MIDI device at
probe failure"

* tag 'sound-fix-4.5-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
ALSA: usb-audio: avoid freeing umidi object twice

Merge tag 'arc-4.5-fixes' of git://git./linux/kernel/git/vgupta/arc

Pull ARC fixes from Vineet Gupta:
"I've been sitting on some of these fixes for a while.

   - Corner case of returning to delay slot from interrupt
   - Changing default interrupt prioiry level
   - Kconfig'ize support for super pages
   - Other minor fixes"

* tag 'arc-4.5-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  ARC: mm: Introduce explicit super page size support
  ARCv2: intc: Allow interruption by lowest priority interrupt
  ARCv2: Check for LL-SC livelock only if LLSC is enabled
  ARC: shrink cpuinfo by not saving full timer BCR
  ARCv2: clocksource: Rename GRTC -> GFRC ...
  ARCv2: STAR 9000950267: Handle return from intr to Delay Slot #2

ALSA: usb-audio: avoid freeing umidi object twice

The 'umidi' object will be free'd on the error path by snd_usbmidi_free()
when tearing down the rawmidi interface. So we shouldn't try to free it
in snd_usbmidi_create() after having registered the rawmidi interface.

Found by KASAN.

Signed-off-by: Andrey Konovalov <andreyknvl@gmail.com>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Merge tag 'pci-v4.5-fixes-1' of git://git./linux/kernel/git/helgaas/pci

Pull PCI fixes from Bjorn Helgaas:
"These are some Renesas binding updates for PCI host controllers, a
  Broadcom fix for a regression we added in v4.5-rc1, and a fix for an
  AER use-after-free problem that can cause memory corruption.

  Summary:

  AER:
    Flush workqueue on device remove to avoid use-after-free (Sebastian Andrzej Siewior)

  Broadcom iProc host bridge driver:
    Allow multiple devices except on PAXC (Ray Jui)

  Renesas R-Car host bridge driver:
    Add gen2 device tree support for r8a7793 (Simon Horman)
    Add device tree support for r8a7793 (Simon Horman)"

* tag 'pci-v4.5-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  PCI: rcar: Add device tree support for r8a7793
  PCI: rcar: Add gen2 device tree support for r8a7793
  PCI: iproc: Allow multiple devices except on PAXC
  PCI/AER: Flush workqueue on device remove to avoid use-after-free

Merge branch 'akpm'(patches from Andrew)

Merge fixes from Andrew Morton:
"10 fixes"

The lockdep hlist conversion is in the locking tree too, waiting for the
next merge window.  Andrew thought it should go in now.  I'll take it,
since it fixes a real problem and looks trivially correct (famous last
words).

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  arch/x86/Kconfig: CONFIG_X86_UV should depend on CONFIG_EFI
  mm: fix pfn_t vs highmem
  kernel/locking/lockdep.c: convert hash tables to hlists
  mm,thp: fix spellos in describing __HAVE_ARCH_FLUSH_PMD_TLB_RANGE
  mm,thp: khugepaged: call pte flush at the time of collapse
  mm/backing-dev.c: fix error path in wb_init()
  mm, dax: check for pmd_none() after split_huge_pmd()
  vsprintf: kptr_restrict is okay in IRQ when 2
  mm: fix filemap.c kernel doc warning
  ubsan: cosmetic fix to Kconfig text

IB/mlx5: Fix RC transport send queue overhead computation

Fix the RC QPs send queue overhead computation to take into account
two additional segments in the WQE which are needed for registration
operations.

The ATOMIC and UMR segments can't coexist together, so chose maximum out
of them.

The commit 9e65dc371b5c ("IB/mlx5: Fix RC transport send queue overhead
computation") was intended to update RC transport as commit messages
states, but added the code to UC transport.

Fixes: 9e65dc371b5c ("IB/mlx5: Fix RC transport send queue overhead computation")
Signed-off-by: Kamal Heib <kamalh@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

IB/ipoib: fix for rare multicast join race condition

A narrow window for race condition still exist between
multicast join thread and *dev_flush workers.
A kernel crash caused by prolong erratic link state changes
was observed (most likely a faulty cabling):

[167275.656270] BUG: unable to handle kernel NULL pointer dereference at
0000000000000020
[167275.665973] IP: [<ffffffffa05f8f2e>] ipoib_mcast_join+0xae/0x1d0 [ib_ipoib]
[167275.674443] PGD 0
[167275.677373] Oops: 0000 [#1] SMP
...
[167275.977530] Call Trace:
[167275.982225]  [<ffffffffa05f92f0>] ? ipoib_mcast_free+0x200/0x200 [ib_ipoib]
[167275.992024]  [<ffffffffa05fa1b7>] ipoib_mcast_join_task+0x2a7/0x490
[ib_ipoib]
[167276.002149]  [<ffffffff8109d5fb>] process_one_work+0x17b/0x470
[167276.010754]  [<ffffffff8109e3cb>] worker_thread+0x11b/0x400
[167276.019088]  [<ffffffff8109e2b0>] ? rescuer_thread+0x400/0x400
[167276.027737]  [<ffffffff810a5aef>] kthread+0xcf/0xe0
Here was a hit spot:
ipoib_mcast_join() {
..............
      rec.qkey      = priv->broadcast->mcmember.qkey;
                                       ^^^^^^^
.....
}
Proposed patch should prevent multicast join task to continue
if link state change is detected.

Signed-off-by: Alex Estrin <alex.estrin@intel.com>
Changes from v4:
- as suggested by Doug Ledford, optimized spinlock usage,
i.e. ipoib_mcast_join() is called with lock held.
Changes from v3:
- sync with priv->lock before flag check.
Chages from v2:
- Move check for OPER_UP flag state to mcast_join() to
ensure no event worker is in progress.
- minor style fixes.
Changes from v1:
- No need to lock again if error detected.
Signed-off-by: Doug Ledford <dledford@redhat.com>

Merge tag 'mmc-v4.5-rc2' of git://git.linaro.org/people/ulf.hansson/mmc

Pull MMC fixes from Ulf Hansson:
"Here are some mmc fixes intended for v4.5 rc4.

  MMC core:
   - Fix an sysfs ABI regression
   - Return an error in a specific error path dealing with mmc ioctls

  MMC host:
   - sdhci-pci|acpi: Fix card detect race for Intel BXT/APL
   - sh_mmcif: Correct TX DMA channel allocation
   - mmc_spi: Fix error handling for dma mapping errors
   - sdhci-of-at91: Fix an unbalance issue for the runtime PM usage count
   - pxamci: Fix the device-tree probe deferral path
   - pxamci: Fix read-only GPIO polarity"

* tag 'mmc-v4.5-rc2' of git://git.linaro.org/people/ulf.hansson/mmc:
  Revert "mmc: block: don't use parameter prefix if built as module"
  mmc: sdhci-acpi: Fix card detect race for Intel BXT/APL
  mmc: sdhci-pci: Fix card detect race for Intel BXT/APL
  mmc: sdhci: Allow override of get_cd() called from sdhci_request()
  mmc: sdhci: Allow override of mmc host operations
  mmc: sh_mmcif: Correct TX DMA channel allocation
  mmc: block: return error on failed mmc_blk_get()
  mmc: pxamci: fix the device-tree probe deferral path
  mmc: mmc_spi: add checks for dma mapping error
  mmc: sdhci-of-at91: fix pm runtime unbalanced issue in error path
  mmc: pxamci: fix again read-only gpio detection polarity

Merge tag 'sound-4.5-rc4' of git://git./linux/kernel/git/tiwai/sound

Pull sound fixes from Takashi Iwai:
"In this rc, we've got more volume than previous rc, unsurprisingly;
  the majority of updates in ASoC are about Intel drivers, and another
  major changes are the continued plumbing of ALSA timer bugs revealed
  by syzkaller fuzzer.  Hopefully both settle down now.

  Other than that, HD-audio received a couple of code fixes as well as
  the usual quirks, and various small fixes are found for FireWire
  devices, ASoC codecs and drivers"

* tag 'sound-4.5-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: (50 commits)
  ASoC: arizona: fref must be limited in pseudo-fractional mode
  ASoC: sigmadsp: Fix missleading return value
  ALSA: timer: Fix race at concurrent reads
  ALSA: firewire-digi00x: Drop bogus const type qualifier on dot_scrt()
  ALSA: hda - Fix bad dereference of jack object
  ALSA: timer: Fix race between stop and interrupt
  ALSA: timer: Fix wrong instance passed to slave callbacks
  ASoC: Intel: Add module tags for common match module
  ASoC: Intel: Load the atom DPCM driver only
  ASoC: Intel: Create independent acpi match module
  ASoC: Intel: Revert "ASoC: Intel: fix ACPI probe regression with Atom DPCM driver"
  ALSA: dummy: Implement timer backend switching more safely
  ALSA: hda - Fix speaker output from VAIO AiO machines
  Revert "ALSA: hda - Fix noise on Gigabyte Z170X mobo"
  ALSA: firewire-tascam: remove needless member for control and status message
  ALSA: firewire-tascam: remove a flag for controller
  ALSA: firewire-tascam: add support for FW-1804
  ALSA: firewire-tascam: fix NULL pointer dereference when model identification fails
  ALSA: hda - Fix static checker warning in patch_hdmi.c
  ASoC: Intel: Skylake: Remove autosuspend delay
  ...

Merge tag 'fbdev-fixes-4.5' of git://git./linux/kernel/git/tomba/linux

Pull fbdev fixes from Tomi Valkeinen:
- fix omap2plus_defconfig to enable omapfb as it was in v4.4
- ocfb: fix timings for margins
- s6e8ax0, da8xx-fb: fix compile warnings
- mmp: fix build failure caused by bad printk parameters
- imxfb: fix clock issue which kept the display off

* tag 'fbdev-fixes-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tomba/linux:
  video: fbdev: imxfb: Provide a reset mechanism
  fbdev: mmp: print IRQ resource using %pR format string
  fbdev: da8xx-fb: remove incorrect type cast
  fbdev: s6e8ax0: avoid unused function warnings
  ocfb: fix tgdel and tvdel timing parameters
  ARM: omap2plus_defconfig: update display configs

Merge tag 'scsi-fixes' of git://git./linux/kernel/git/jejb/scsi

Pull SCSI fixes from James Bottomley:
"A set of seven fixes:

  Two regressions in the new hisi_sas arm driver, a blacklist entry for
  the marvell console which was causing a reset cascade without it, a
  race fix in the WRITE_SAME/DISCARD routines, a retry fix for the rdac
  driver, without which, it would prematurely return EIO and a couple of
  fixes for the hyper-v storvsc driver"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  block/sd: Return -EREMOTEIO when WRITE SAME and DISCARD are disabled
  SCSI: Add Marvell Console to VPD blacklist
  scsi_dh_rdac: always retry MODE SELECT on command lock violation
  storvsc: Use the specified target ID in device lookup
  storvsc: Install the storvsc specific timeout handler for FC devices
  hisi_sas: fix v1 hw check for slot error
  hisi_sas: add dependency for HAS_IOMEM

Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux

Pull drm amd fixes from Dave Airlie:
"Been pretty quiet.

  This is an amdgpu fixes pull from AMD, a bunch of powerplay stability
  fixes, race fix, hibernate fix, and a possible circular locking fix"

* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux: (21 commits)
  drm/amdgpu: fix issue with overlapping userptrs
  drm/radeon: hold reference to fences in radeon_sa_bo_new
  drm/amdgpu: remove unnecessary forward declaration
  drm/amdgpu: hold reference to fences in amdgpu_sa_bo_new (v2)
  drm/amdgpu: fix s4 resume
  drm/amdgpu/cz: plumb pg flags through to powerplay
  drm/amdgpu/tonga: plumb pg flags through to powerplay
  drma/dmgpu: move cg and pg flags into shared headers
  drm/amdgpu: remove unused cg defines
  drm/amdgpu: add a cgs interface to fetch cg and pg flags
  drm/amd/powerplay/tonga: disable vce pg
  drm/amd/powerplay/tonga: disable uvd pg
  drm/amd/powerplay/cz: disable vce pg
  drm/amd/powerplay/cz: disable uvd pg
  drm/amdgpu: be consistent with uvd cg flags
  drm/amdgpu: clean up vce pg flags for cz/st
  drm/amdgpu: handle vce pg flags properly
  drm/amdgpu: handle uvd pg flags properly
  drm/amdgpu/dpm/ci: switch over to the common pcie caps interface
  drm/amdgpu/cik: don't mess with aspm if gpu is root bus
  ...

Merge branch 'for-linus' of git://git./linux/kernel/git/jmorris/linux-security

Pull crypto fix from James Morris.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
EVM: Use crypto_memneq() for digest comparisons

Merge branch 'for-linus-4.5' of git://git./linux/kernel/git/mason/linux-btrfs

Pull btrfs fixes from Chris Mason:
"This has a few fixes from Filipe, along with a readdir fix from Dave
  that we've been testing for some time"

* 'for-linus-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  btrfs: properly set the termination value of ctx->pos in readdir
  Btrfs: fix hang on extent buffer lock caused by the inode_paths ioctl
  Btrfs: remove no longer used function extent_read_full_page_nolock()
  Btrfs: fix page reading in extent_same ioctl leading to csum errors
  Btrfs: fix invalid page accesses in extent_same (dedup) ioctl

Merge tag 'xfs-fixes-for-linus-4.5' of git://git./linux/kernel/git/dgc/linux-xfs

Pull xfs fix from Dve Chinner:
"This contains a fix for an endian conversion issue in new CRC
validation in log recovery that was discovered on a ppc64 platform"

* tag 'xfs-fixes-for-linus-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs:
xfs: fix endianness error when checking log block crc on big endian platforms

Merge tag 'asoc-fix-v4.5-rc4' of git://git./linux/kernel/git/broonie/sound into for-linus

ASoC: Fixes for v4.5

A rather large batch of fixes here, almost all in the Intel driver.
The changes that got merged in this merge window for Skylake were rather
large and as well as issues that you'd expect in a large block of new
code there were some problems created for older processors which needed
fixing up. Things are largely settling down now hopefully.

EVM: Use crypto_memneq() for digest comparisons

This patch fixes vulnerability CVE-2016-2085. The problem exists
because the vm_verify_hmac() function includes a use of memcmp().
Unfortunately, this allows timing side channel attacks; specifically
a MAC forgery complexity drop from 2^128 to 2^12. This patch changes
the memcmp() to the cryptographically safe crypto_memneq().

Reported-by: Xiaofei Rex Guo <xiaofei.rex.guo@intel.com>
Signed-off-by: Ryan Ware <ware@linux.intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>

ARC: mm: Introduce explicit super page size support

MMUv4 supports 2 concurrent page sizes: Normal and Super [4K to 16M]

So far Linux supported a single super page size for a given Normal page,
depending on the software page walking address split.
e.g. we had 11:8:13 address split for 8K page, which meant super page
was 2 ^(8+13) = 2M (given that THP size has to be PMD_SHIFT)

Now we turn this around, by allowing multiple Super Pages in Kconfig
(currently 2M and 16M only) and forcing page walker address split to
PGDIR_SHIFT and PAGE_SHIFT

For configs without Super page, things are same as before and
PGDIR_SHIFT can be hacked to get non default address split

The motivation for this change is a customer who needs 16M super page
and a 8K Normal page combo.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

Merge tag 'phy-for-4.5-rc' of git://git./linux/kernel/git/kishon/linux-phy into usb-linus

Kishon writes:

phy: for 4.5-rc

*) Fix error handling code in phy core [phy_power_on()]
*) phy-twl4030-usb fixes for unloading the module
*) Restrict phy-hi6220-usb to HiSilicon arm64

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

arch/x86/Kconfig: CONFIG_X86_UV should depend on CONFIG_EFI

arch/x86/built-in.o: In function `uv_bios_call':
(.text+0xeba00): undefined reference to `efi_call'

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Suggested-by: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk>
Acked-by: Alex Thorlton <athorlton@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm: fix pfn_t vs highmem

The pfn_t type uses an unsigned long to store a pfn + flags value.  On a
64-bit platform the upper 12 bits of an unsigned long are never used for
storing the value of a pfn.  However, this is not true on highmem
platforms, all 32-bits of a pfn value are used to address a 44-bit
physical address space.  A pfn_t needs to store a 64-bit value.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=112211
Fixes: 01c8f1c44b83 ("mm, dax, gpu: convert vm_insert_mixed to pfn_t")
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reported-by: Stuart Foster <smf.linux@ntlworld.com>
Reported-by: Julian Margetson <runaway@candw.ms>
Tested-by: Julian Margetson <runaway@candw.ms>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/locking/lockdep.c: convert hash tables to hlists

Mike said:

: CONFIG_UBSAN_ALIGNMENT breaks x86-64 kernel with lockdep enabled, i.  e
: kernel with CONFIG_UBSAN_ALIGNMENT fails to load without even any error
: message.
:
: The problem is that ubsan callbacks use spinlocks and might be called
: before lockdep is initialized.  Particularly this line in the
: reserve_ebda_region function causes problem:
:
: lowmem = *(unsigned short *)__va(BIOS_LOWMEM_KILOBYTES);
:
: If i put lockdep_init() before reserve_ebda_region call in
: x86_64_start_reservations kernel loads well.

Fix this ordering issue permanently: change lockdep so that it uses
hlists for the hash tables.  Unlike a list_head, an hlist_head is in its
initialized state when it is all-zeroes, so lockdep is ready for
operation immediately upon boot - lockdep_init() need not have run.

The patch will also save some memory.

lockdep_init() and lockdep_initialized can be done away with now - a 4.6
patch has been prepared to do this.

Reported-by: Mike Krinkin <krinkin.m.u@gmail.com>
Suggested-by: Mike Krinkin <krinkin.m.u@gmail.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm,thp: fix spellos in describing __HAVE_ARCH_FLUSH_PMD_TLB_RANGE

[akpm@linux-foundation.org: s/threshhold/threshold/]
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm,thp: khugepaged: call pte flush at the time of collapse

This showed up on ARC when running LMBench bw_mem tests as Overlapping
TLB Machine Check Exception triggered due to STLB entry (2M pages)
overlapping some NTLB entry (regular 8K page).

bw_mem 2m touches a large chunk of vaddr creating NTLB entries.  In the
interim khugepaged kicks in, collapsing the contiguous ptes into a
single pmd.  pmdp_collapse_flush()->flush_pmd_tlb_range() is called to
flush out NTLB entries for the ptes.  This for ARC (by design) can only
shootdown STLB entries (for pmd).  The stray NTLB entries cause the
overlap with the subsequent STLB entry for collapsed page.  So make
pmdp_collapse_flush() call pte flush interface not pmd flush.

Note that originally all thp flush call sites in generic code called
flush_tlb_range() leaving it to architecture to implement the flush for
pte and/or pmd.  Commit 12ebc1581ad11454 changed this by calling a new
opt-in API flush_pmd_tlb_range() which made the semantics more explicit
but failed to distinguish the pte vs pmd flush in generic code, which is
what this patch fixes.

Note that ARC can fixed w/o touching the generic pmdp_collapse_flush()
by defining a ARC version, but that defeats the purpose of generic
version, plus sementically this is the right thing to do.

Fixes STAR 9000961194: LMBench on AXS103 triggering duplicate TLB
exceptions with super pages

Fixes: 12ebc1581ad11454 ("mm,thp: introduce flush_pmd_tlb_range")
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: <stable@vger.kernel.org> [4.4]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/backing-dev.c: fix error path in wb_init()

We need to use post-decrement to get percpu_counter_destroy() called on
&wb->stat[0]. Moreover, the pre-decremebt would cause infinite
out-of-bounds accesses if the setup code failed at i==0.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Vladimir Davydov <vdavydov@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm, dax: check for pmd_none() after split_huge_pmd()

DAX implements split_huge_pmd() by clearing pmd.  This simple approach
reduces memory overhead, as we don't need to deposit page table on huge
page mapping to make split_huge_pmd() never-fail.  PTE table can be
allocated and populated later on page fault from backing store.

But one side effect is that have to check if pmd is pmd_none() after
split_huge_pmd().  In most places we do this already to deal with
parallel MADV_DONTNEED.

But I found two call sites which is not affected by MADV_DONTNEED (due
down_write(mmap_sem)), but need to have the check to work with DAX
properly.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

vsprintf: kptr_restrict is okay in IRQ when 2

The kptr_restrict flag, when set to 1, only prints the kernel address
when the user has CAP_SYSLOG.  When it is set to 2, the kernel address
is always printed as zero.  When set to 1, this needs to check whether
or not we're in IRQ.

However, when set to 2, this check is unneccessary, and produces
confusing results in dmesg.  Thus, only make sure we're not in IRQ when
mode 1 is used, but not mode 2.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm: fix filemap.c kernel doc warning

Add missing kernel-doc notation for function parameter 'gfp_mask' to fix
kernel-doc warning.

mm/filemap.c:1898: warning: No description found for parameter 'gfp_mask'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

ubsan: cosmetic fix to Kconfig text

When enabling UBSAN_SANITIZE_ALL, the kernel image size gets increased
significantly (~3x). So, it sounds better to have some note in Kconfig.

And, fixed a typo.

Signed-off-by: Yang Shi <yang.shi@linaro.org>
Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Merge tag 'gpio-v4.5-2' of git://git./linux/kernel/git/linusw/linux-gpio

Pull GPIO fixes from Linus Walleij:
- Probe errorpath fix for the Altera
- irqchip ofnode pointer added to the DaVinci driver
- controller instance number correction for DaVinci

* tag 'gpio-v4.5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
  gpio: davinci: Fix the number of controllers allocated
  gpio: davinci: Add the missing of-node pointer
  gpio: gpio-altera: Remove gpiochip on probe failure.

Merge tag 'platform-drivers-x86-v4.5-3' of git://git.infradead.org/users/dvhart/linux-platform-drivers-x86

Pull x86 platform driver fixes from Darren Hart:
"Just two small fixes for the 4.5-rc cycle:

  intel_scu_ipcutil:
   - underflow in scu_reg_access()

  intel-hid:
   - fix incorrect entries in intel_hid_keymap"

* tag 'platform-drivers-x86-v4.5-3' of git://git.infradead.org/users/dvhart/linux-platform-drivers-x86:
  intel_scu_ipcutil: underflow in scu_reg_access()
  intel-hid: fix incorrect entries in intel_hid_keymap

Merge git://git./linux/kernel/git/davem/net

Pull networking fixes from David Miller:

1) Fix BPF handling of branch offset adjustmnets on backjumps, from
    Daniel Borkmann.

2) Make sure selinux knows about SOCK_DESTROY netlink messages, from
    Lorenzo Colitti.

3) Fix openvswitch tunnel mtu regression, from David Wragg.

4) Fix ICMP handling of TCP sockets in syn_recv state, from Eric
    Dumazet.

5) Fix SCTP user hmacid byte ordering bug, from Xin Long.

6) Fix recursive locking in ipv6 addrconf, from Subash Abhinov
    Kasiviswanathan.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
  bpf: fix branch offset adjustment on backjumps after patching ctx expansion
  vxlan, gre, geneve: Set a large MTU on ovs-created tunnel devices
  geneve: Relax MTU constraints
  vxlan: Relax MTU constraints
  flow_dissector: Fix unaligned access in __skb_flow_dissector when used by eth_get_headlen
  of: of_mdio: Add marvell, 88e1145 to whitelist of PHY compatibilities.
  selinux: nlmsgtab: add SOCK_DESTROY to the netlink mapping tables
  sctp: translate network order to host order when users get a hmacid
  enic: increment devcmd2 result ring in case of timeout
  tg3: Fix for tg3 transmit queue 0 timed out when too many gso_segs
  net:Add sysctl_max_skb_frags
  tcp: do not drop syn_recv on all icmp reports
  ipv6: fix a lockdep splat
  unix: correctly track in-flight fds in sending process user_struct
  update be2net maintainers' email addresses
  dwc_eth_qos: Reset hardware before PHY start
  ipv6: addrconf: Fix recursive spin lock call

IB/core: Fix reading capability mask of the port info class

When checking specific attribute from a bit mask, need to use bitwise
AND and not logical AND, fixed that.

Fixes: 145d9c541032 ('IB/core: Display extended counter set if
available')
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Matan Barak <matanb@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Reviewed-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

net/mlx4: fix some error handling in mlx4_multi_func_init()

The while loop after err_slaves should use post-decrement; otherwise
we'll fail to do the kfrees for i==0, and will run into out-of-bounds
accesses if the setup above failed already at i==0.

[I'm not sure why one even bothers populating the ->vlan_filter array:
mlx4.h isn't #included by anything outside
drivers/net/ethernet/mellanox/mlx4/, and "git grep -C2 -w vlan_filter
drivers/net/ethernet/mellanox/mlx4/" seems to suggest that the
vlan_filter elements aren't used at all.]

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Doug Ledford <dledford@redhat.com>

Revert "mmc: block: don't use parameter prefix if built as module"

This reverts commit 829b6962f7e3cfc06f7c5c26269fd47ad48cf503.

Revert this change as it causes a sysfs path to change and therefore
introduces and ABI regression. More precisely Android's vold is not being
able to access /sys/module/mmcblk/parameters/perdev_minors any more, since
the path becomes changed to: "/sys/module/mmc_block/..."

Fixes: 829b6962f7e3 ("mmc: block: don't use parameter prefix if built as
module")
Reported-by: John Stultz <john.stultz@linaro.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

ARM: 8502/1: mm: mark section-aligned portion of rodata NX

When rodata is large enough that it crosses a section boundary after the
kernel text, mark the rest NX. This is as close to full NX of rodata as
we can get without splitting page tables or doing section alignment via
CONFIG_DEBUG_ALIGN_RODATA.

When the config is:

CONFIG_DEBUG_RODATA=y
# CONFIG_DEBUG_ALIGN_RODATA is not set

Before:

---[ Kernel Mapping ]---
0x80000000-0x80100000           1M     RW NX SHD
0x80100000-0x80a00000           9M     ro x  SHD
0x80a00000-0xa0000000         502M     RW NX SHD

After:

---[ Kernel Mapping ]---
0x80000000-0x80100000           1M     RW NX SHD
0x80100000-0x80700000           6M     ro x  SHD
0x80700000-0x80a00000           3M     ro NX SHD
0x80a00000-0xa0000000         502M     RW NX SHD

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8518/1: Use correct symbols for XIP_KERNEL

For an XIP build, _etext does not represent the end of the
binary image that needs to stay mapped into the MODULES_VADDR area.
Years ago, data came before text in the memory map. However,
now that the order is text/init/data, an XIP_KERNEL needs to map
up to the data location in order to keep from cutting off
parts of the kernel that are needed.
We only map up to the beginning of data because data has already been
copied, so there's no reason to keep it around anymore.
A new symbol is created to make it clear what it is we are referring
to.

This fixes the bug where you might lose the end of your kernel area
after page table setup is complete.

Signed-off-by: Chris Brandt <chris.brandt@renesas.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8515/2: move .vectors and .stubs sections back into the kernel VMA

Commit b9b32bf70f2f ("ARM: use linker magic for vectors and vector stubs")
updated the linker script to emit the .vectors and .stubs sections into a
VMA range that is zero based and disjoint from the normal static kernel
region. The reason for that was that this way, the sections can be placed
exactly 4 KB apart, while the payload of the .vectors section is only 32
bytes.

Since the symbols that are part of the .stubs section are emitted into the
kallsyms table, they appear with zero based addresses as well, e.g.,

  00001004 t vector_rst
  00001020 t vector_irq
  000010a0 t vector_dabt
  00001120 t vector_pabt
  000011a0 t vector_und
  00001220 t vector_addrexcptn
  00001240 t vector_fiq
  00001240 T vector_fiq_offset

As this confuses perf when it accesses the kallsyms tables, commit
7122c3e9154b ("scripts/link-vmlinux.sh: only filter kernel symbols for
arm") implemented a somewhat ugly special case for ARM, where the value
of CONFIG_PAGE_OFFSET is passed to scripts/kallsyms, and symbols whose
addresses are below it are filtered out. Note that this special case only
applies to CONFIG_XIP_KERNEL=n, not because the issue the patch addresses
exists only in that case, but because finding a limit below which to apply
the filtering is not entirely straightforward.

Since the .vectors and .stubs sections contain position independent code
that is never executed in place, we can emit it at its most likely runtime
VMA (for more recent CPUs), which is 0xffff0000 for the vector table and
0xffff1000 for the stubs. Not only does this fix the perf issue with
kallsyms, allowing us to drop the special case in scripts/kallsyms
entirely, it also gives debuggers a more realistic view of the address
space, and setting breakpoints or single stepping through code in the
vector table or the stubs is more likely to work as expected on CPUs that
use a high vector address. E.g.,

  00001240 A vector_fiq_offset
  ...
  c0c35000 T __init_begin
  c0c35000 T __vectors_start
  c0c35020 T __stubs_start
  c0c35020 T __vectors_end
  c0c352e0 T _sinittext
  c0c352e0 T __stubs_end
  ...
  ffff1004 t vector_rst
  ffff1020 t vector_irq
  ffff10a0 t vector_dabt
  ffff1120 t vector_pabt
  ffff11a0 t vector_und
  ffff1220 t vector_addrexcptn
  ffff1240 T vector_fiq

(Note that vector_fiq_offset is now an absolute symbol, which kallsyms
already ignores by default)

The LMA footprint is identical with or without this change, only the VMAs
are different:

  Before:
  Idx Name          Size      VMA       LMA       File off  Algn
   ...
   14 .notes        00000024  c0c34020  c0c34020  00a34020  2**2
                    CONTENTS, ALLOC, LOAD, READONLY, CODE
   15 .vectors      00000020  00000000  c0c35000  00a40000  2**1
                    CONTENTS, ALLOC, LOAD, READONLY, CODE
   16 .stubs        000002c0  00001000  c0c35020  00a41000  2**5
                    CONTENTS, ALLOC, LOAD, READONLY, CODE
   17 .init.text    0006b1b8  c0c352e0  c0c352e0  00a452e0  2**5
                    CONTENTS, ALLOC, LOAD, READONLY, CODE
   ...

  After:
  Idx Name          Size      VMA       LMA       File off  Algn
   ...
   14 .notes        00000024  c0c34020  c0c34020  00a34020  2**2
                    CONTENTS, ALLOC, LOAD, READONLY, CODE
   15 .vectors      00000020  ffff0000  c0c35000  00a40000  2**1
                    CONTENTS, ALLOC, LOAD, READONLY, CODE
   16 .stubs        000002c0  ffff1000  c0c35020  00a41000  2**5
                    CONTENTS, ALLOC, LOAD, READONLY, CODE
   17 .init.text    0006b1b8  c0c352e0  c0c352e0  00a452e0  2**5
                    CONTENTS, ALLOC, LOAD, READONLY, CODE
   ...

Acked-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Chris Brandt <chris.brandt@renesas.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8514/1: remove duplicate definitions of __vectors_start and __stubs_start

Commit b9b32bf70f2f ("ARM: use linker magic for vectors and vector stubs")
introduced new global definitions of __vectors_start and __stubs_start,
and changed the existing ones to have internal linkage only. However, these
symbols are still visible to kallsyms, and due to the way the .vectors and
.stubs sections are emitted at the base of the VMA space, these duplicate
definitions have conflicting values.

  $ nm -n vmlinux |grep -E __vectors|__stubs
  00000000 t __vectors_start
  00001000 t __stubs_start
  c0e77000 T __vectors_start
  c0e77020 T __stubs_start

This is completely harmless by itself, since the wrong values are local
symbols that cannot be referenced by other object files directly. However,
since these symbols are also listed in the kallsyms symbol table in some
cases (i.e., CONFIG_KALLSYMS_ALL=y and CONFIG_XIP_KERNEL=y), having these
conflicting values can be confusing. So either remove them, or make them
strictly local.

Acked-by: Chris Brandt <chris.brandt@renesas.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8513/1: xip: Move XIP linking to a separate file

When building an XIP kernel, the linker script needs to be much different
than a conventional kernel's script. Over time, it's been difficult to
maintain both XIP and non-XIP layouts in one linker script. Therefore,
this patch separates the two procedures into two completely different
files.

The new linker script is essentially a straight copy of the current script
with all the non-CONFIG_XIP_KERNEL portions removed.

Additionally, all CONFIG_XIP_KERNEL portions have been removed from the
existing linker script...never to return again.

It should be noted that this does not fix any current XIP issues, but
rather is the first move in fixing them properly with subsequent patches.

Signed-off-by: Chris Brandt <chris.brandt@renesas.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8511/1: ARM64: kernel: PSCI: move PSCI idle management code to drivers/firmware

ARM64 PSCI kernel interfaces that initialize idle states and implement
the suspend API to enter them are generic and can be shared with the
ARM architecture.

To achieve that goal, this patch moves ARM64 PSCI idle management
code to drivers/firmware, so that the interface to initialize and
enter idle states can actually be shared by ARM and ARM64 arches
back-ends.

The ARM generic CPUidle implementation also requires the definition of
a cpuidle_ops section entry for the kernel to initialize the CPUidle
operations at boot based on the enable-method (ie ARM64 has the
statically initialized cpu_ops counterparts for that purpose); therefore
this patch also adds the required section entry on CONFIG_ARM for PSCI so
that the kernel can initialize the PSCI CPUidle back-end when PSCI is
the probed enable-method.

On ARM64 this patch provides no functional change.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com> [arch/arm64]
Acked-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Jisheng Zhang <jszhang@marvell.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8510/1: rework ARM_CPU_SUSPEND dependencies

The code enabled by the ARM_CPU_SUSPEND config option is used by
kernel subsystems for purposes that go beyond system suspend so its
config entry should be augmented to take more default options into
account and avoid forcing its selection to prevent dependencies
override.

To achieve this goal, this patch reworks the ARM_CPU_SUSPEND config
entry and updates its default config value (by adding the BL_SWITCHER
option to it) and its dependencies (ARCH_SUSPEND_POSSIBLE), so that the
symbol is still selected by default by the subsystems requiring it and
at the same time enforcing the dependencies correctly.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8508/2: videobuf2-dc: Let drivers specify DMA attrs

DMA allocations might be subject to certain requirements specific to the
hardware using the buffers, such as availability of kernel mapping (for
contents fix-ups in the driver). The only entity that knows them is the
driver, so it must share this knowledge with vb2-dc.

This patch extends the alloc_ctx initialization interface to let the
driver specify DMA attrs, which are then stored inside the allocation
context and will be used for all allocations with that context.

As a side effect, all dma_*_coherent() calls are turned into
dma_*_attrs() calls, because the attributes need to be carried over
through all DMA operations.

Signed-off-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8507/1: dma-mapping: Use DMA_ATTR_ALLOC_SINGLE_PAGES hint to optimize alloc

If we know that TLB efficiency will not be an issue when memory is
accessed then it's not terribly important to allocate big chunks of
memory.  The whole point of allocating the big chunks was that it would
make TLB usage efficient.

As Marek Szyprowski indicated:
    Please note that mapping memory with larger pages significantly
    improves performance, especially when IOMMU has a little TLB
    cache. This can be easily observed when multimedia devices do
    processing of RGB data with 90/270 degree rotation
Image rotation is distinctly an operation that needs to bounce around
through memory, so it makes sense that TLB efficiency is important
there.

Video decoding, on the other hand, is a fairly sequential operation.
During video decoding it's not expected that we'll be jumping all over
memory.  Decoding video is also pretty heavy and the TLB misses aren't a
huge deal.  Presumably most HW video acceleration users of dma-mapping
will not care about huge pages and will set DMA_ATTR_ALLOC_SINGLE_PAGES.

Allocating big chunks of memory is quite expensive, especially if we're
doing it repeadly and memory is full.  In one (out of tree) usage model
it is common that arm_iommu_alloc_attrs() is called 16 times in a row,
each one trying to allocate 4 MB of memory.  This is called whenever the
system encounters a new video, which could easily happen while the
memory system is stressed out.  In fact, on certain social media
websites that auto-play video and have infinite scrolling, it's quite
common to see not just one of these 16x4MB allocations but 2 or 3 right
after another.  Asking the system even to do a small amount of extra
work to give us big chunks in this case is just not a good use of time.

Allocating big chunks of memory is also expensive indirectly.  Even if
we ask the system not to do ANY extra work to allocate _our_ memory,
we're still potentially eating up all big chunks in the system.
Presumably there are other users in the system that aren't quite as
flexible and that actually need these big chunks.  By eating all the big
chunks we're causing extra work for the rest of the system.  We also may
start making other memory allocations fail.  While the system may be
robust to such failures (as is the case with dwc2 USB trying to allocate
buffers for Ethernet data and with WiFi trying to allocate buffers for
WiFi data), it is yet another big performance hit.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8506/1: common: DMA-mapping: add DMA_ATTR_ALLOC_SINGLE_PAGES attribute

This patch adds the DMA_ATTR_ALLOC_SINGLE_PAGES attribute to the
DMA-mapping subsystem.

This attribute can be used as a hint to the DMA-mapping subsystem that
it's likely not worth it to try to allocate large pages behind the
scenes.  Large pages are likely to make an IOMMU TLB work more
efficiently but may not be worth it.  See the Documentation contained in
this patch for more details about this attribute and when to use it.

Note that the name of the hint (DMA_ATTR_ALLOC_SINGLE_PAGES) is loosely
based on the name MADV_NOHUGEPAGE.  Just as there is MADV_NOHUGEPAGE
vs. MADV_HUGEPAGE we could also add an "opposite" attribute to
DMA_ATTR_ALLOC_SINGLE_PAGES.  Without having the "opposite" attribute
the lack of DMA_ATTR_ALLOC_SINGLE_PAGES means "use your best judgement
about whether to use small pages or large pages".

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8505/1: dma-mapping: Optimize allocation

The __iommu_alloc_buffer() is expected to be called to allocate pretty
sizeable buffers.  Upon simple tests of video I saw it trying to
allocate 4,194,304 bytes.  The function tries to allocate large chunks
in order to optimize IOMMU TLB usage.

The current function is very, very slow.

One problem is the way it keeps trying and trying to allocate big
chunks.  Imagine a very fragmented memory that has 4M free but no
contiguous pages at all.  Further imagine allocating 4M (1024 pages).
We'll do the following memory allocations:
- For page 1:
  - Try to allocate order 10 (no retry)
  - Try to allocate order 9 (no retry)
  - ...
  - Try to allocate order 0 (with retry, but not needed)
- For page 2:
  - Try to allocate order 9 (no retry)
  - Try to allocate order 8 (no retry)
  - ...
  - Try to allocate order 0 (with retry, but not needed)
- ...
- ...

Total number of calls to alloc() calls for this case is:
  sum(int(math.log(i, 2)) + 1 for i in range(1, 1025))
  => 9228

The above is obviously worse case, but given how slow alloc can be we
really want to try to avoid even somewhat bad cases.  I timed the old
code with a device under memory pressure and it wasn't hard to see it
take more than 120 seconds to allocate 4 megs of memory! (NOTE: testing
was done on kernel 3.14, so possibly mainline would behave
differently).

A second problem is that allocating big chunks under memory pressure
when we don't need them is just not a great idea anyway unless we really
need them.  We can make due pretty well with smaller chunks so it's
probably wise to leave bigger chunks for other users once memory
pressure is on.

Let's adjust the allocation like this:

1. If a big chunk fails, stop trying to hard and bump down to lower
   order allocations.
2. Don't try useless orders.  The whole point of big chunks is to
   optimize the TLB and it can really only make use of 2M, 1M, 64K and
   4K sizes.

We'll still tend to eat up a bunch of big chunks, but that might be the
right answer for some users.  A future patch could possibly add a new
DMA_ATTR that would let the caller decide that TLB optimization isn't
important and that we should use smaller chunks.  Presumably this would
be a sane strategy for some callers.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

ARM: 8504/1: __arch_xprod_64(): small optimization

The tmp variable is used twice: first to pose as a register containing
a value of zero, and then to provide a temporary register that initially
is zero and get added some value. But somehow gcc decides to split those
two usages in different registers.

Example code:

u64 div64const1000(u64 x)
{
u32 y = 1000;
do_div(x, y);
return x;
}

Result:

div64const1000:
push {r4, r5, r6, r7, lr}
mov lr, #0
mov r6, r0
mov r7, r1
adr r5, .L8
ldrd r4, [r5]
mov r1, lr
umull r2, r3, r4, r6
cmn r2, r4
adcs r3, r3, r5
adc r2, lr, #0
umlal r3, r2, r5, r6
umlal r3, r1, r4, r7
mov r3, #0
adds r2, r1, r2
adc r3, r3, #0
umlal r2, r3, r5, r7
lsr r0, r2, #9
lsr r1, r3, #9
orr r0, r0, r3, lsl #23
pop {r4, r5, r6, r7, pc}
.align 3
.L8:
.word -1924145349
.word -2095944041

Full kernel build size:

   text    data     bss     dec     hex filename
13663814 1553940 351368 15569122 ed90e2 vmlinux

Here the two instances of 'tmp' are assigned to r1 and lr.

To avoid that, let's mark the first 'tmp' usage in __arch_xprod_64()
with a "+r" constraint even if the register is not written to, so to
create a dependency for the second usage with the effect of enforcing
a single temporary register throughout.

Result:

div64const1000:
push {r4, r5, r6, r7}
movs r3, #0
adr r5, .L8
ldrd r4, [r5]
umull r6, r7, r4, r0
cmn r6, r4
adcs r7, r7, r5
adc r6, r3, #0
umlal r7, r6, r5, r0
umlal r7, r3, r4, r1
mov r7, #0
adds r6, r3, r6
adc r7, r7, #0
umlal r6, r7, r5, r1
lsr r0, r6, #9
lsr r1, r7, #9
orr r0, r0, r7, lsl #23
pop {r4, r5, r6, r7}
bx lr
.align 3
.L8:
.word -1924145349
.word -2095944041

   text    data     bss     dec     hex filename
13663438 1553940 351368 15568746 ed8f6a vmlinux

This time 'tmp' is assigned to r3 and used throughout. However, by being
assigned to r3, that blocks usage of the r2-r3 double register slot for
64-bit values, forcing more registers to be spilled on the stack. Let's
try to help it by forcing 'tmp' to the caller-saved ip register.

Result:

div64const1000:
stmfd sp!, {r4, r5}
mov ip, #0
adr r5, .L8
ldrd r4, [r5]
umull r2, r3, r4, r0
cmn r2, r4
adcs r3, r3, r5
adc r2, ip, #0
umlal r3, r2, r5, r0
umlal r3, ip, r4, r1
mov r3, #0
adds r2, ip, r2
adc r3, r3, #0
umlal r2, r3, r5, r1
mov r0, r2, lsr #9
mov r1, r3, lsr #9
orr r0, r0, r3, asl #23
ldmfd sp!, {r4, r5}
bx lr
.align 3
.L8:
.word -1924145349
.word -2095944041

   text    data     bss     dec     hex filename
13662838 1553940 351368 15568146 ed8d12 vmlinux

We could make the code marginally smaller yet by forcing 'tmp' to lr
instead, but that would have a negative inpact on branch prediction for
which "bx lr" is optimal.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

thermal: cpu_cooling: fix out of bounds access in time_in_idle

In __cpufreq_cooling_register() we allocate the arrays for time_in_idle
and time_in_idle_timestamp to be as big as the number of cpus in this
cpufreq device. However, in get_load() we access this array using the
cpu number as index, which can result in an out of bound access.

Index time_in_idle{,_timestamp} using the index in the cpufreq_device's
allowed_cpus mask, as we do for the load_cpu array in
cpufreq_get_requested_power()

Reported-by: Nicolas Boichat <drinkcat@chromium.org>
Cc: Amit Daniel Kachhap <amit.kachhap@gmail.com>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Eduardo Valentin <edubezval@gmail.com>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

btrfs: properly set the termination value of ctx->pos in readdir

The value of ctx->pos in the last readdir call is supposed to be set to
INT_MAX due to 32bit compatibility, unless 'pos' is intentially set to a
larger value, then it's LLONG_MAX.

There's a report from PaX SIZE_OVERFLOW plugin that "ctx->pos++"
overflows (https://forums.grsecurity.net/viewtopic.php?f=1&t=4284), on a
64bit arch, where the value is 0x7fffffffffffffff ie. LLONG_MAX before
the increment.

We can get to that situation like that:

* emit all regular readdir entries
* still in the same call to readdir, bump the last pos to INT_MAX
* next call to readdir will not emit any entries, but will reach the
  bump code again, finds pos to be INT_MAX and sets it to LLONG_MAX

Normally this is not a problem, but if we call readdir again, we'll find
'pos' set to LLONG_MAX and the unconditional increment will overflow.

The report from Victor at
(http://thread.gmane.org/gmane.comp.file-systems.btrfs/49500) with debugging
print shows that pattern:

Overflow: e
Overflow: 7fffffff
Overflow: 7fffffffffffffff
PAX: size overflow detected in function btrfs_real_readdir
   fs/btrfs/inode.c:5760 cicus.935_282 max, count: 9, decl: pos; num: 0;
   context: dir_context;
CPU: 0 PID: 2630 Comm: polkitd Not tainted 4.2.3-grsec #1
Hardware name: Gigabyte Technology Co., Ltd. H81ND2H/H81ND2H, BIOS F3 08/11/2015
  ffffffff81901608 0000000000000000 ffffffff819015e6 ffffc90004973d48
  ffffffff81742f0f 0000000000000007 ffffffff81901608 ffffc90004973d78
  ffffffff811cb706 0000000000000000 ffff8800d47359e0 ffffc90004973ed8
Call Trace:
  [<ffffffff81742f0f>] dump_stack+0x4c/0x7f
  [<ffffffff811cb706>] report_size_overflow+0x36/0x40
  [<ffffffff812ef0bc>] btrfs_real_readdir+0x69c/0x6d0
  [<ffffffff811dafc8>] iterate_dir+0xa8/0x150
  [<ffffffff811e6d8d>] ? __fget_light+0x2d/0x70
  [<ffffffff811dba3a>] SyS_getdents+0xba/0x1c0
Overflow: 1a
  [<ffffffff811db070>] ? iterate_dir+0x150/0x150
  [<ffffffff81749b69>] entry_SYSCALL_64_fastpath+0x12/0x83

The jump from 7fffffff to 7fffffffffffffff happens when new dir entries
are not yet synced and are processed from the delayed list. Then the code
could go to the bump section again even though it might not emit any new
dir entries from the delayed list.

The fix avoids entering the "bump" section again once we've finished
emitting the entries, both for synced and delayed entries.

References: https://forums.grsecurity.net/viewtopic.php?f=1&t=4284
Reported-by: Victor <services@swwu.com>
CC: stable@vger.kernel.org
Signed-off-by: David Sterba <dsterba@suse.com>
Tested-by: Holger Hoffstätte <holger.hoffstaette@googlemail.com>
Signed-off-by: Chris Mason <clm@fb.com>

ARM: 8519/1: ICST: try other dividends than 1

Since the dawn of time the ICST code has only supported divide
by one or hang in an eternal loop. Luckily we were always dividing
by one because the reference frequency for the systems using
the ICSTs is 24MHz and the [min,max] values for the PLL input
if [10,320] MHz for ICST307 and [6,200] for ICST525, so the loop
will always terminate immediately without assigning any divisor
for the reference frequency.

But for the code to make sense, let's insert the missing i++

Reported-by: David Binderman <dcb314@hotmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

Merge tag 'gic-fixes-4.5-rc4' of git://git./linux/kernel/git/maz/arm-platforms into irq/urgent

Pull GIC fixes from Marc for 4.5-rc4:

- Two fixes addressing cascaded GICv1/GICv2 (affinity setting, EOImode)
- One fix addressing possible missed interrupts on GICv3

mmc: sdhci-acpi: Fix card detect race for Intel BXT/APL

Intel BXT/APL use a card detect GPIO however the host controller
will not enable bus power unless it's card detect also reflects
the presence of a card. Unfortunately those 2 things race which
can result in commands not starting, after which the controller
does nothing and there is a 10 second wait for the driver's
10-second timer to timeout.

That is fixed by having the driver look also at the present state
register to determine if the card is present. Consequently, provide
a 'get_cd' mmc host operation for BXT/APL that does that.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org # v4.4+
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

mmc: sdhci-pci: Fix card detect race for Intel BXT/APL

Intel BXT/APL use a card detect GPIO however the host controller
will not enable bus power unless it's card detect also reflects
the presence of a card. Unfortunately those 2 things race which
can result in commands not starting, after which the controller
does nothing and there is a 10 second wait for the driver's
10-second timer to timeout.

That is fixed by having the driver look also at the present state
register to determine if the card is present. Consequently, provide
a 'get_cd' mmc host operation for BXT/APL that does that.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org # v4.4+
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

mmc: sdhci: Allow override of get_cd() called from sdhci_request()

Drivers may need to provide their own get_cd() mmc host op, but
currently the internals of the current op (sdhci_get_cd()) are
provided by sdhci_do_get_cd() which is also called from
sdhci_request().

To allow override of the get_cd functionality, change sdhci_request()
to call ->get_cd() instead of sdhci_do_get_cd().

Note, in the future the call to ->get_cd() will likely be removed
from sdhci_request() since most drivers don't need actually it.
However this change is being done now to facilitate a subsequent
bug fix.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org # v4.4+
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

mmc: sdhci: Allow override of mmc host operations

In the past, fixes for specific hardware devices were implemented
in sdhci using quirks. That approach is no longer accepted because
the growing number of quirks was starting to make the code difficult
to understand and maintain.

One alternative to quirks, is to allow drivers to override the default
mmc host operations. This patch makes it easy to do that, and it is
needed for a subsequent bug fix, for which separate patches are
provided.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org # v4.4+
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

mips: Differentiate between 32 and 64 bit ELF header

Depending on the configuration either the 32 or 64 bit version of
elf_check_arch() is defined. parse_crash_elf{32|64}_headers() does
some basic verification of the ELF header via
vmcore_elf{32|64}_check_arch() which happen to map to elf_check_arch().
Since the implementation 32 and 64 bit version of elf_check_arch()
differ, we use the wrong type:

   In file included from include/linux/elf.h:4:0,
                    from fs/proc/vmcore.c:13:
   fs/proc/vmcore.c: In function 'parse_crash_elf64_headers':
>> arch/mips/include/asm/elf.h:228:23: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]
     struct elfhdr *__h = (hdr);     \
                          ^
   include/linux/crash_dump.h:41:37: note: in expansion of macro 'elf_check_arch'
    #define vmcore_elf64_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x))
                                        ^
   fs/proc/vmcore.c:1015:4: note: in expansion of macro 'vmcore_elf64_check_arch'
      !vmcore_elf64_check_arch(&ehdr) ||
       ^

Therefore, we rather define vmcore_elf{32|64}_check_arch() as a
basic machine check and use it also in binfm_elf?32.c as well.

Signed-off-by: Daniel Wagner <daniel.wagner@bmw-carit.de>
Suggested-by: Maciej W. Rozycki <macro@imgtec.com>
Reviewed-by: Maciej W. Rozycki <macro@imgtec.com>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12529/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>