x86: Cleanup highmap after brk is concluded

Now cleanup_highmap actually is in two steps: one is early in head64.c
and only clears above _end; a second one is in init_memory_mapping() and
tries to clean from _brk_end to _end.
It should check if those boundaries are PMD_SIZE aligned but currently
does not.
Also init_memory_mapping() is called several times for numa or memory
hotplug, so we really should not handle initial kernel mappings there.

This patch moves cleanup_highmap() down after _brk_end is settled so
we can do everything in one step.
Also we honor max_pfn_mapped in the implementation of cleanup_highmap.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
LKML-Reference: <alpine.DEB.2.00.1103171739050.3382@kaball-desktop>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 2d2673c28aff2754af1e6e8848e9068ab1a6cca5..5655c2272adb86244f1927127a40c705c5a4d447 100644 (file)
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -77,9 +77,6 @@ void __init x86_64_start_kernel(char * real_mode_data)
        /* Make NULL pointers segfault */
        zap_identity_mappings();
 
-       /* Cleanup the over mapped high alias */
-       cleanup_highmap();
-
        max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;
 
        for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) {

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index b176f2b1f45d8ddfd27fad371411e5c76ec832f5..4a52a5f9afcbe79ae2bb5d89915542c496d64466 100644 (file)
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -294,30 +294,11 @@ static void __init init_gbpages(void)
        else
                direct_gbpages = 0;
 }
-
-static void __init cleanup_highmap_brk_end(void)
-{
-       pud_t *pud;
-       pmd_t *pmd;
-
-       mmu_cr4_features = read_cr4();
-
-       /*
-        * _brk_end cannot change anymore, but it and _end may be
-        * located on different 2M pages. cleanup_highmap(), however,
-        * can only consider _end when it runs, so destroy any
-        * mappings beyond _brk_end here.
-        */
-       pud = pud_offset(pgd_offset_k(_brk_end), _brk_end);
-       pmd = pmd_offset(pud, _brk_end - 1);
-       while (++pmd <= pmd_offset(pud, (unsigned long)_end - 1))
-               pmd_clear(pmd);
-}
 #else
 static inline void init_gbpages(void)
 {
 }
-static inline void cleanup_highmap_brk_end(void)
+static void __init cleanup_highmap(void)
 {
 }
 #endif
@@ -330,8 +311,6 @@ static void __init reserve_brk(void)
        /* Mark brk area as locked down and no longer taking any
           new allocations */
        _brk_start = 0;
-
-       cleanup_highmap_brk_end();
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
@@ -950,6 +929,8 @@ void __init setup_arch(char **cmdline_p)
         */
        reserve_brk();
 
+       cleanup_highmap();
+
        memblock.current_limit = get_max_mapped();
        memblock_x86_fill();
 

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index a08a62cb136e409892701924732d8791bde4cff7..7026505a33ba20dd086f88c3b014abaf7445c722 100644 (file)
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -51,6 +51,7 @@
 #include <asm/numa.h>
 #include <asm/cacheflush.h>
 #include <asm/init.h>
+#include <asm/setup.h>
 
 static int __init parse_direct_gbpages_off(char *arg)
 {
@@ -293,18 +294,18 @@ void __init init_extra_mapping_uc(unsigned long phys, unsigned long size)
  * to the compile time generated pmds. This results in invalid pmds up
  * to the point where we hit the physaddr 0 mapping.
  *
- * We limit the mappings to the region from _text to _end.  _end is
- * rounded up to the 2MB boundary. This catches the invalid pmds as
+ * We limit the mappings to the region from _text to _brk_end.  _brk_end
+ * is rounded up to the 2MB boundary. This catches the invalid pmds as
  * well, as they are located before _text:
  */
 void __init cleanup_highmap(void)
 {
        unsigned long vaddr = __START_KERNEL_map;
-       unsigned long end = roundup((unsigned long)_end, PMD_SIZE) - 1;
+       unsigned long vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT);
+       unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1;
        pmd_t *pmd = level2_kernel_pgt;
-       pmd_t *last_pmd = pmd + PTRS_PER_PMD;
 
-       for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) {
+       for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) {
                if (pmd_none(*pmd))
                        continue;
                if (vaddr < (unsigned long) _text || vaddr > end)