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mm: move definition for LRU isolation modes to a header
[deliverable/linux.git] / include / linux / kernel.h
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CommitLineData
1#ifndef _LINUX_KERNEL_H
2#define _LINUX_KERNEL_H
3
4/*
5 * 'kernel.h' contains some often-used function prototypes etc
6 */
7#define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1)
8#define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask))
9
10#ifdef __KERNEL__
11
12#include <stdarg.h>
13#include <linux/linkage.h>
14#include <linux/stddef.h>
15#include <linux/types.h>
16#include <linux/compiler.h>
17#include <linux/bitops.h>
18#include <linux/log2.h>
19#include <linux/typecheck.h>
20#include <linux/dynamic_debug.h>
21#include <asm/byteorder.h>
22#include <asm/bug.h>
23
24extern const char linux_banner[];
25extern const char linux_proc_banner[];
26
27#define USHORT_MAX ((u16)(~0U))
28#define SHORT_MAX ((s16)(USHORT_MAX>>1))
29#define SHORT_MIN (-SHORT_MAX - 1)
30#define INT_MAX ((int)(~0U>>1))
31#define INT_MIN (-INT_MAX - 1)
32#define UINT_MAX (~0U)
33#define LONG_MAX ((long)(~0UL>>1))
34#define LONG_MIN (-LONG_MAX - 1)
35#define ULONG_MAX (~0UL)
36#define LLONG_MAX ((long long)(~0ULL>>1))
37#define LLONG_MIN (-LLONG_MAX - 1)
38#define ULLONG_MAX (~0ULL)
39
40#define STACK_MAGIC 0xdeadbeef
41
42#define ALIGN(x, a) __ALIGN_KERNEL((x), (a))
43#define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (mask))
44#define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))
45#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
46
47#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
48
49/*
50 * This looks more complex than it should be. But we need to
51 * get the type for the ~ right in round_down (it needs to be
52 * as wide as the result!), and we want to evaluate the macro
53 * arguments just once each.
54 */
55#define __round_mask(x, y) ((__typeof__(x))((y)-1))
56#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
57#define round_down(x, y) ((x) & ~__round_mask(x, y))
58
59#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
60#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
61#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
62#define DIV_ROUND_CLOSEST(x, divisor)( \
63{ \
64 typeof(divisor) __divisor = divisor; \
65 (((x) + ((__divisor) / 2)) / (__divisor)); \
66} \
67)
68
69#define _RET_IP_ (unsigned long)__builtin_return_address(0)
70#define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
71
72#ifdef CONFIG_LBDAF
73# include <asm/div64.h>
74# define sector_div(a, b) do_div(a, b)
75#else
76# define sector_div(n, b)( \
77{ \
78 int _res; \
79 _res = (n) % (b); \
80 (n) /= (b); \
81 _res; \
82} \
83)
84#endif
85
86/**
87 * upper_32_bits - return bits 32-63 of a number
88 * @n: the number we're accessing
89 *
90 * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress
91 * the "right shift count >= width of type" warning when that quantity is
92 * 32-bits.
93 */
94#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
95
96/**
97 * lower_32_bits - return bits 0-31 of a number
98 * @n: the number we're accessing
99 */
100#define lower_32_bits(n) ((u32)(n))
101
102#define KERN_EMERG "<0>" /* system is unusable */
103#define KERN_ALERT "<1>" /* action must be taken immediately */
104#define KERN_CRIT "<2>" /* critical conditions */
105#define KERN_ERR "<3>" /* error conditions */
106#define KERN_WARNING "<4>" /* warning conditions */
107#define KERN_NOTICE "<5>" /* normal but significant condition */
108#define KERN_INFO "<6>" /* informational */
109#define KERN_DEBUG "<7>" /* debug-level messages */
110
111/* Use the default kernel loglevel */
112#define KERN_DEFAULT "<d>"
113/*
114 * Annotation for a "continued" line of log printout (only done after a
115 * line that had no enclosing \n). Only to be used by core/arch code
116 * during early bootup (a continued line is not SMP-safe otherwise).
117 */
118#define KERN_CONT "<c>"
119
120extern int console_printk[];
121
122#define console_loglevel (console_printk[0])
123#define default_message_loglevel (console_printk[1])
124#define minimum_console_loglevel (console_printk[2])
125#define default_console_loglevel (console_printk[3])
126
127struct completion;
128struct pt_regs;
129struct user;
130
131#ifdef CONFIG_PREEMPT_VOLUNTARY
132extern int _cond_resched(void);
133# define might_resched() _cond_resched()
134#else
135# define might_resched() do { } while (0)
136#endif
137
138#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
139 void __might_sleep(const char *file, int line, int preempt_offset);
140/**
141 * might_sleep - annotation for functions that can sleep
142 *
143 * this macro will print a stack trace if it is executed in an atomic
144 * context (spinlock, irq-handler, ...).
145 *
146 * This is a useful debugging help to be able to catch problems early and not
147 * be bitten later when the calling function happens to sleep when it is not
148 * supposed to.
149 */
150# define might_sleep() \
151 do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0)
152#else
153 static inline void __might_sleep(const char *file, int line,
154 int preempt_offset) { }
155# define might_sleep() do { might_resched(); } while (0)
156#endif
157
158#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
159
160#define abs(x) ({ \
161 long __x = (x); \
162 (__x < 0) ? -__x : __x; \
163 })
164
165#ifdef CONFIG_PROVE_LOCKING
166void might_fault(void);
167#else
168static inline void might_fault(void)
169{
170 might_sleep();
171}
172#endif
173
174extern struct atomic_notifier_head panic_notifier_list;
175extern long (*panic_blink)(long time);
176NORET_TYPE void panic(const char * fmt, ...)
177 __attribute__ ((NORET_AND format (printf, 1, 2))) __cold;
178extern void oops_enter(void);
179extern void oops_exit(void);
180extern int oops_may_print(void);
181NORET_TYPE void do_exit(long error_code)
182 ATTRIB_NORET;
183NORET_TYPE void complete_and_exit(struct completion *, long)
184 ATTRIB_NORET;
185extern unsigned long simple_strtoul(const char *,char **,unsigned int);
186extern long simple_strtol(const char *,char **,unsigned int);
187extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
188extern long long simple_strtoll(const char *,char **,unsigned int);
189extern int strict_strtoul(const char *, unsigned int, unsigned long *);
190extern int strict_strtol(const char *, unsigned int, long *);
191extern int strict_strtoull(const char *, unsigned int, unsigned long long *);
192extern int strict_strtoll(const char *, unsigned int, long long *);
193extern int sprintf(char * buf, const char * fmt, ...)
194 __attribute__ ((format (printf, 2, 3)));
195extern int vsprintf(char *buf, const char *, va_list)
196 __attribute__ ((format (printf, 2, 0)));
197extern int snprintf(char * buf, size_t size, const char * fmt, ...)
198 __attribute__ ((format (printf, 3, 4)));
199extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
200 __attribute__ ((format (printf, 3, 0)));
201extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
202 __attribute__ ((format (printf, 3, 4)));
203extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
204 __attribute__ ((format (printf, 3, 0)));
205extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
206 __attribute__ ((format (printf, 2, 3)));
207extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
208
209extern int sscanf(const char *, const char *, ...)
210 __attribute__ ((format (scanf, 2, 3)));
211extern int vsscanf(const char *, const char *, va_list)
212 __attribute__ ((format (scanf, 2, 0)));
213
214extern int get_option(char **str, int *pint);
215extern char *get_options(const char *str, int nints, int *ints);
216extern unsigned long long memparse(const char *ptr, char **retptr);
217
218extern int core_kernel_text(unsigned long addr);
219extern int __kernel_text_address(unsigned long addr);
220extern int kernel_text_address(unsigned long addr);
221extern int func_ptr_is_kernel_text(void *ptr);
222
223struct pid;
224extern struct pid *session_of_pgrp(struct pid *pgrp);
225
226/*
227 * FW_BUG
228 * Add this to a message where you are sure the firmware is buggy or behaves
229 * really stupid or out of spec. Be aware that the responsible BIOS developer
230 * should be able to fix this issue or at least get a concrete idea of the
231 * problem by reading your message without the need of looking at the kernel
232 * code.
233 *
234 * Use it for definite and high priority BIOS bugs.
235 *
236 * FW_WARN
237 * Use it for not that clear (e.g. could the kernel messed up things already?)
238 * and medium priority BIOS bugs.
239 *
240 * FW_INFO
241 * Use this one if you want to tell the user or vendor about something
242 * suspicious, but generally harmless related to the firmware.
243 *
244 * Use it for information or very low priority BIOS bugs.
245 */
246#define FW_BUG "[Firmware Bug]: "
247#define FW_WARN "[Firmware Warn]: "
248#define FW_INFO "[Firmware Info]: "
249
250#ifdef CONFIG_PRINTK
251asmlinkage int vprintk(const char *fmt, va_list args)
252 __attribute__ ((format (printf, 1, 0)));
253asmlinkage int printk(const char * fmt, ...)
254 __attribute__ ((format (printf, 1, 2))) __cold;
255
256extern int __printk_ratelimit(const char *func);
257#define printk_ratelimit() __printk_ratelimit(__func__)
258extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
259 unsigned int interval_msec);
260
261extern int printk_delay_msec;
262
263/*
264 * Print a one-time message (analogous to WARN_ONCE() et al):
265 */
266#define printk_once(x...) ({ \
267 static bool __print_once; \
268 \
269 if (!__print_once) { \
270 __print_once = true; \
271 printk(x); \
272 } \
273})
274
275void log_buf_kexec_setup(void);
276#else
277static inline int vprintk(const char *s, va_list args)
278 __attribute__ ((format (printf, 1, 0)));
279static inline int vprintk(const char *s, va_list args) { return 0; }
280static inline int printk(const char *s, ...)
281 __attribute__ ((format (printf, 1, 2)));
282static inline int __cold printk(const char *s, ...) { return 0; }
283static inline int printk_ratelimit(void) { return 0; }
284static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \
285 unsigned int interval_msec) \
286 { return false; }
287
288/* No effect, but we still get type checking even in the !PRINTK case: */
289#define printk_once(x...) printk(x)
290
291static inline void log_buf_kexec_setup(void)
292{
293}
294#endif
295
296extern int printk_needs_cpu(int cpu);
297extern void printk_tick(void);
298
299extern void asmlinkage __attribute__((format(printf, 1, 2)))
300 early_printk(const char *fmt, ...);
301
302unsigned long int_sqrt(unsigned long);
303
304static inline void console_silent(void)
305{
306 console_loglevel = 0;
307}
308
309static inline void console_verbose(void)
310{
311 if (console_loglevel)
312 console_loglevel = 15;
313}
314
315extern void bust_spinlocks(int yes);
316extern void wake_up_klogd(void);
317extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
318extern int panic_timeout;
319extern int panic_on_oops;
320extern int panic_on_unrecovered_nmi;
321extern int panic_on_io_nmi;
322extern const char *print_tainted(void);
323extern void add_taint(unsigned flag);
324extern int test_taint(unsigned flag);
325extern unsigned long get_taint(void);
326extern int root_mountflags;
327
328/* Values used for system_state */
329extern enum system_states {
330 SYSTEM_BOOTING,
331 SYSTEM_RUNNING,
332 SYSTEM_HALT,
333 SYSTEM_POWER_OFF,
334 SYSTEM_RESTART,
335 SYSTEM_SUSPEND_DISK,
336} system_state;
337
338#define TAINT_PROPRIETARY_MODULE 0
339#define TAINT_FORCED_MODULE 1
340#define TAINT_UNSAFE_SMP 2
341#define TAINT_FORCED_RMMOD 3
342#define TAINT_MACHINE_CHECK 4
343#define TAINT_BAD_PAGE 5
344#define TAINT_USER 6
345#define TAINT_DIE 7
346#define TAINT_OVERRIDDEN_ACPI_TABLE 8
347#define TAINT_WARN 9
348#define TAINT_CRAP 10
349#define TAINT_FIRMWARE_WORKAROUND 11
350
351extern void dump_stack(void) __cold;
352
353enum {
354 DUMP_PREFIX_NONE,
355 DUMP_PREFIX_ADDRESS,
356 DUMP_PREFIX_OFFSET
357};
358extern void hex_dump_to_buffer(const void *buf, size_t len,
359 int rowsize, int groupsize,
360 char *linebuf, size_t linebuflen, bool ascii);
361extern void print_hex_dump(const char *level, const char *prefix_str,
362 int prefix_type, int rowsize, int groupsize,
363 const void *buf, size_t len, bool ascii);
364extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
365 const void *buf, size_t len);
366
367extern const char hex_asc[];
368#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
369#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
370
371static inline char *pack_hex_byte(char *buf, u8 byte)
372{
373 *buf++ = hex_asc_hi(byte);
374 *buf++ = hex_asc_lo(byte);
375 return buf;
376}
377
378#ifndef pr_fmt
379#define pr_fmt(fmt) fmt
380#endif
381
382#define pr_emerg(fmt, ...) \
383 printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
384#define pr_alert(fmt, ...) \
385 printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
386#define pr_crit(fmt, ...) \
387 printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
388#define pr_err(fmt, ...) \
389 printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
390#define pr_warning(fmt, ...) \
391 printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
392#define pr_notice(fmt, ...) \
393 printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
394#define pr_info(fmt, ...) \
395 printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
396#define pr_cont(fmt, ...) \
397 printk(KERN_CONT fmt, ##__VA_ARGS__)
398
399/* pr_devel() should produce zero code unless DEBUG is defined */
400#ifdef DEBUG
401#define pr_devel(fmt, ...) \
402 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
403#else
404#define pr_devel(fmt, ...) \
405 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
406#endif
407
408/* If you are writing a driver, please use dev_dbg instead */
409#if defined(DEBUG)
410#define pr_debug(fmt, ...) \
411 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
412#elif defined(CONFIG_DYNAMIC_DEBUG)
413/* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
414#define pr_debug(fmt, ...) \
415 dynamic_pr_debug(fmt, ##__VA_ARGS__)
416#else
417#define pr_debug(fmt, ...) \
418 ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
419#endif
420
421/*
422 * ratelimited messages with local ratelimit_state,
423 * no local ratelimit_state used in the !PRINTK case
424 */
425#ifdef CONFIG_PRINTK
426#define printk_ratelimited(fmt, ...) ({ \
427 static struct ratelimit_state _rs = { \
428 .interval = DEFAULT_RATELIMIT_INTERVAL, \
429 .burst = DEFAULT_RATELIMIT_BURST, \
430 }; \
431 \
432 if (__ratelimit(&_rs)) \
433 printk(fmt, ##__VA_ARGS__); \
434})
435#else
436/* No effect, but we still get type checking even in the !PRINTK case: */
437#define printk_ratelimited printk
438#endif
439
440#define pr_emerg_ratelimited(fmt, ...) \
441 printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
442#define pr_alert_ratelimited(fmt, ...) \
443 printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
444#define pr_crit_ratelimited(fmt, ...) \
445 printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
446#define pr_err_ratelimited(fmt, ...) \
447 printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
448#define pr_warning_ratelimited(fmt, ...) \
449 printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
450#define pr_notice_ratelimited(fmt, ...) \
451 printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
452#define pr_info_ratelimited(fmt, ...) \
453 printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
454/* no pr_cont_ratelimited, don't do that... */
455/* If you are writing a driver, please use dev_dbg instead */
456#if defined(DEBUG)
457#define pr_debug_ratelimited(fmt, ...) \
458 printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
459#else
460#define pr_debug_ratelimited(fmt, ...) \
461 ({ if (0) printk_ratelimited(KERN_DEBUG pr_fmt(fmt), \
462 ##__VA_ARGS__); 0; })
463#endif
464
465/*
466 * General tracing related utility functions - trace_printk(),
467 * tracing_on/tracing_off and tracing_start()/tracing_stop
468 *
469 * Use tracing_on/tracing_off when you want to quickly turn on or off
470 * tracing. It simply enables or disables the recording of the trace events.
471 * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on
472 * file, which gives a means for the kernel and userspace to interact.
473 * Place a tracing_off() in the kernel where you want tracing to end.
474 * From user space, examine the trace, and then echo 1 > tracing_on
475 * to continue tracing.
476 *
477 * tracing_stop/tracing_start has slightly more overhead. It is used
478 * by things like suspend to ram where disabling the recording of the
479 * trace is not enough, but tracing must actually stop because things
480 * like calling smp_processor_id() may crash the system.
481 *
482 * Most likely, you want to use tracing_on/tracing_off.
483 */
484#ifdef CONFIG_RING_BUFFER
485void tracing_on(void);
486void tracing_off(void);
487/* trace_off_permanent stops recording with no way to bring it back */
488void tracing_off_permanent(void);
489int tracing_is_on(void);
490#else
491static inline void tracing_on(void) { }
492static inline void tracing_off(void) { }
493static inline void tracing_off_permanent(void) { }
494static inline int tracing_is_on(void) { return 0; }
495#endif
496
497enum ftrace_dump_mode {
498 DUMP_NONE,
499 DUMP_ALL,
500 DUMP_ORIG,
501};
502
503#ifdef CONFIG_TRACING
504extern void tracing_start(void);
505extern void tracing_stop(void);
506extern void ftrace_off_permanent(void);
507
508extern void
509ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
510
511static inline void __attribute__ ((format (printf, 1, 2)))
512____trace_printk_check_format(const char *fmt, ...)
513{
514}
515#define __trace_printk_check_format(fmt, args...) \
516do { \
517 if (0) \
518 ____trace_printk_check_format(fmt, ##args); \
519} while (0)
520
521/**
522 * trace_printk - printf formatting in the ftrace buffer
523 * @fmt: the printf format for printing
524 *
525 * Note: __trace_printk is an internal function for trace_printk and
526 * the @ip is passed in via the trace_printk macro.
527 *
528 * This function allows a kernel developer to debug fast path sections
529 * that printk is not appropriate for. By scattering in various
530 * printk like tracing in the code, a developer can quickly see
531 * where problems are occurring.
532 *
533 * This is intended as a debugging tool for the developer only.
534 * Please refrain from leaving trace_printks scattered around in
535 * your code.
536 */
537
538#define trace_printk(fmt, args...) \
539do { \
540 __trace_printk_check_format(fmt, ##args); \
541 if (__builtin_constant_p(fmt)) { \
542 static const char *trace_printk_fmt \
543 __attribute__((section("__trace_printk_fmt"))) = \
544 __builtin_constant_p(fmt) ? fmt : NULL; \
545 \
546 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \
547 } else \
548 __trace_printk(_THIS_IP_, fmt, ##args); \
549} while (0)
550
551extern int
552__trace_bprintk(unsigned long ip, const char *fmt, ...)
553 __attribute__ ((format (printf, 2, 3)));
554
555extern int
556__trace_printk(unsigned long ip, const char *fmt, ...)
557 __attribute__ ((format (printf, 2, 3)));
558
559extern void trace_dump_stack(void);
560
561/*
562 * The double __builtin_constant_p is because gcc will give us an error
563 * if we try to allocate the static variable to fmt if it is not a
564 * constant. Even with the outer if statement.
565 */
566#define ftrace_vprintk(fmt, vargs) \
567do { \
568 if (__builtin_constant_p(fmt)) { \
569 static const char *trace_printk_fmt \
570 __attribute__((section("__trace_printk_fmt"))) = \
571 __builtin_constant_p(fmt) ? fmt : NULL; \
572 \
573 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs); \
574 } else \
575 __ftrace_vprintk(_THIS_IP_, fmt, vargs); \
576} while (0)
577
578extern int
579__ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap);
580
581extern int
582__ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
583
584extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode);
585#else
586static inline void
587ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
588static inline int
589trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
590
591static inline void tracing_start(void) { }
592static inline void tracing_stop(void) { }
593static inline void ftrace_off_permanent(void) { }
594static inline void trace_dump_stack(void) { }
595static inline int
596trace_printk(const char *fmt, ...)
597{
598 return 0;
599}
600static inline int
601ftrace_vprintk(const char *fmt, va_list ap)
602{
603 return 0;
604}
605static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
606#endif /* CONFIG_TRACING */
607
608/*
609 * Display an IP address in readable format.
610 */
611
612#define NIPQUAD(addr) \
613 ((unsigned char *)&addr)[0], \
614 ((unsigned char *)&addr)[1], \
615 ((unsigned char *)&addr)[2], \
616 ((unsigned char *)&addr)[3]
617#define NIPQUAD_FMT "%u.%u.%u.%u"
618
619/*
620 * min()/max()/clamp() macros that also do
621 * strict type-checking.. See the
622 * "unnecessary" pointer comparison.
623 */
624#define min(x, y) ({ \
625 typeof(x) _min1 = (x); \
626 typeof(y) _min2 = (y); \
627 (void) (&_min1 == &_min2); \
628 _min1 < _min2 ? _min1 : _min2; })
629
630#define max(x, y) ({ \
631 typeof(x) _max1 = (x); \
632 typeof(y) _max2 = (y); \
633 (void) (&_max1 == &_max2); \
634 _max1 > _max2 ? _max1 : _max2; })
635
636/**
637 * clamp - return a value clamped to a given range with strict typechecking
638 * @val: current value
639 * @min: minimum allowable value
640 * @max: maximum allowable value
641 *
642 * This macro does strict typechecking of min/max to make sure they are of the
643 * same type as val. See the unnecessary pointer comparisons.
644 */
645#define clamp(val, min, max) ({ \
646 typeof(val) __val = (val); \
647 typeof(min) __min = (min); \
648 typeof(max) __max = (max); \
649 (void) (&__val == &__min); \
650 (void) (&__val == &__max); \
651 __val = __val < __min ? __min: __val; \
652 __val > __max ? __max: __val; })
653
654/*
655 * ..and if you can't take the strict
656 * types, you can specify one yourself.
657 *
658 * Or not use min/max/clamp at all, of course.
659 */
660#define min_t(type, x, y) ({ \
661 type __min1 = (x); \
662 type __min2 = (y); \
663 __min1 < __min2 ? __min1: __min2; })
664
665#define max_t(type, x, y) ({ \
666 type __max1 = (x); \
667 type __max2 = (y); \
668 __max1 > __max2 ? __max1: __max2; })
669
670/**
671 * clamp_t - return a value clamped to a given range using a given type
672 * @type: the type of variable to use
673 * @val: current value
674 * @min: minimum allowable value
675 * @max: maximum allowable value
676 *
677 * This macro does no typechecking and uses temporary variables of type
678 * 'type' to make all the comparisons.
679 */
680#define clamp_t(type, val, min, max) ({ \
681 type __val = (val); \
682 type __min = (min); \
683 type __max = (max); \
684 __val = __val < __min ? __min: __val; \
685 __val > __max ? __max: __val; })
686
687/**
688 * clamp_val - return a value clamped to a given range using val's type
689 * @val: current value
690 * @min: minimum allowable value
691 * @max: maximum allowable value
692 *
693 * This macro does no typechecking and uses temporary variables of whatever
694 * type the input argument 'val' is. This is useful when val is an unsigned
695 * type and min and max are literals that will otherwise be assigned a signed
696 * integer type.
697 */
698#define clamp_val(val, min, max) ({ \
699 typeof(val) __val = (val); \
700 typeof(val) __min = (min); \
701 typeof(val) __max = (max); \
702 __val = __val < __min ? __min: __val; \
703 __val > __max ? __max: __val; })
704
705
706/*
707 * swap - swap value of @a and @b
708 */
709#define swap(a, b) \
710 do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
711
712/**
713 * container_of - cast a member of a structure out to the containing structure
714 * @ptr: the pointer to the member.
715 * @type: the type of the container struct this is embedded in.
716 * @member: the name of the member within the struct.
717 *
718 */
719#define container_of(ptr, type, member) ({ \
720 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
721 (type *)( (char *)__mptr - offsetof(type,member) );})
722
723struct sysinfo;
724extern int do_sysinfo(struct sysinfo *info);
725
726#endif /* __KERNEL__ */
727
728#ifndef __EXPORTED_HEADERS__
729#ifndef __KERNEL__
730#warning Attempt to use kernel headers from user space, see http://kernelnewbies.org/KernelHeaders
731#endif /* __KERNEL__ */
732#endif /* __EXPORTED_HEADERS__ */
733
734#define SI_LOAD_SHIFT 16
735struct sysinfo {
736 long uptime; /* Seconds since boot */
737 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
738 unsigned long totalram; /* Total usable main memory size */
739 unsigned long freeram; /* Available memory size */
740 unsigned long sharedram; /* Amount of shared memory */
741 unsigned long bufferram; /* Memory used by buffers */
742 unsigned long totalswap; /* Total swap space size */
743 unsigned long freeswap; /* swap space still available */
744 unsigned short procs; /* Number of current processes */
745 unsigned short pad; /* explicit padding for m68k */
746 unsigned long totalhigh; /* Total high memory size */
747 unsigned long freehigh; /* Available high memory size */
748 unsigned int mem_unit; /* Memory unit size in bytes */
749 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
750};
751
752/* Force a compilation error if condition is true */
753#define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition))
754
755/* Force a compilation error if condition is constant and true */
756#define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)]))
757
758/* Force a compilation error if a constant expression is not a power of 2 */
759#define BUILD_BUG_ON_NOT_POWER_OF_2(n) \
760 BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
761
762/* Force a compilation error if condition is true, but also produce a
763 result (of value 0 and type size_t), so the expression can be used
764 e.g. in a structure initializer (or where-ever else comma expressions
765 aren't permitted). */
766#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
767#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
768
769/* Trap pasters of __FUNCTION__ at compile-time */
770#define __FUNCTION__ (__func__)
771
772/* This helps us to avoid #ifdef CONFIG_NUMA */
773#ifdef CONFIG_NUMA
774#define NUMA_BUILD 1
775#else
776#define NUMA_BUILD 0
777#endif
778
779/* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
780#ifdef CONFIG_FTRACE_MCOUNT_RECORD
781# define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD
782#endif
783
784#endif
Linux kernel - Deliverables
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