linux/include/linux/kernel.h
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   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 USHRT_MAX       ((u16)(~0U))
  28#define SHRT_MAX        ((s16)(USHRT_MAX>>1))
  29#define SHRT_MIN        ((s16)(-SHRT_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
 378extern int hex_to_bin(char ch);
 379
 380#ifndef pr_fmt
 381#define pr_fmt(fmt) fmt
 382#endif
 383
 384#define pr_emerg(fmt, ...) \
 385        printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 386#define pr_alert(fmt, ...) \
 387        printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 388#define pr_crit(fmt, ...) \
 389        printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 390#define pr_err(fmt, ...) \
 391        printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 392#define pr_warning(fmt, ...) \
 393        printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 394#define pr_warn pr_warning
 395#define pr_notice(fmt, ...) \
 396        printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 397#define pr_info(fmt, ...) \
 398        printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 399#define pr_cont(fmt, ...) \
 400        printk(KERN_CONT fmt, ##__VA_ARGS__)
 401
 402/* pr_devel() should produce zero code unless DEBUG is defined */
 403#ifdef DEBUG
 404#define pr_devel(fmt, ...) \
 405        printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 406#else
 407#define pr_devel(fmt, ...) \
 408        ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
 409#endif
 410
 411/* If you are writing a driver, please use dev_dbg instead */
 412#if defined(DEBUG)
 413#define pr_debug(fmt, ...) \
 414        printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 415#elif defined(CONFIG_DYNAMIC_DEBUG)
 416/* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
 417#define pr_debug(fmt, ...) \
 418        dynamic_pr_debug(fmt, ##__VA_ARGS__)
 419#else
 420#define pr_debug(fmt, ...) \
 421        ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
 422#endif
 423
 424/*
 425 * ratelimited messages with local ratelimit_state,
 426 * no local ratelimit_state used in the !PRINTK case
 427 */
 428#ifdef CONFIG_PRINTK
 429#define printk_ratelimited(fmt, ...)  ({                                \
 430        static DEFINE_RATELIMIT_STATE(_rs,                              \
 431                                      DEFAULT_RATELIMIT_INTERVAL,       \
 432                                      DEFAULT_RATELIMIT_BURST);         \
 433                                                                        \
 434        if (__ratelimit(&_rs))                                          \
 435                printk(fmt, ##__VA_ARGS__);                             \
 436})
 437#else
 438/* No effect, but we still get type checking even in the !PRINTK case: */
 439#define printk_ratelimited printk
 440#endif
 441
 442#define pr_emerg_ratelimited(fmt, ...) \
 443        printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
 444#define pr_alert_ratelimited(fmt, ...) \
 445        printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
 446#define pr_crit_ratelimited(fmt, ...) \
 447        printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
 448#define pr_err_ratelimited(fmt, ...) \
 449        printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
 450#define pr_warning_ratelimited(fmt, ...) \
 451        printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
 452#define pr_warn_ratelimited pr_warning_ratelimited
 453#define pr_notice_ratelimited(fmt, ...) \
 454        printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
 455#define pr_info_ratelimited(fmt, ...) \
 456        printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
 457/* no pr_cont_ratelimited, don't do that... */
 458/* If you are writing a driver, please use dev_dbg instead */
 459#if defined(DEBUG)
 460#define pr_debug_ratelimited(fmt, ...) \
 461        printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
 462#else
 463#define pr_debug_ratelimited(fmt, ...) \
 464        ({ if (0) printk_ratelimited(KERN_DEBUG pr_fmt(fmt), \
 465                                     ##__VA_ARGS__); 0; })
 466#endif
 467
 468/*
 469 * General tracing related utility functions - trace_printk(),
 470 * tracing_on/tracing_off and tracing_start()/tracing_stop
 471 *
 472 * Use tracing_on/tracing_off when you want to quickly turn on or off
 473 * tracing. It simply enables or disables the recording of the trace events.
 474 * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on
 475 * file, which gives a means for the kernel and userspace to interact.
 476 * Place a tracing_off() in the kernel where you want tracing to end.
 477 * From user space, examine the trace, and then echo 1 > tracing_on
 478 * to continue tracing.
 479 *
 480 * tracing_stop/tracing_start has slightly more overhead. It is used
 481 * by things like suspend to ram where disabling the recording of the
 482 * trace is not enough, but tracing must actually stop because things
 483 * like calling smp_processor_id() may crash the system.
 484 *
 485 * Most likely, you want to use tracing_on/tracing_off.
 486 */
 487#ifdef CONFIG_RING_BUFFER
 488void tracing_on(void);
 489void tracing_off(void);
 490/* trace_off_permanent stops recording with no way to bring it back */
 491void tracing_off_permanent(void);
 492int tracing_is_on(void);
 493#else
 494static inline void tracing_on(void) { }
 495static inline void tracing_off(void) { }
 496static inline void tracing_off_permanent(void) { }
 497static inline int tracing_is_on(void) { return 0; }
 498#endif
 499
 500enum ftrace_dump_mode {
 501        DUMP_NONE,
 502        DUMP_ALL,
 503        DUMP_ORIG,
 504};
 505
 506#ifdef CONFIG_TRACING
 507extern void tracing_start(void);
 508extern void tracing_stop(void);
 509extern void ftrace_off_permanent(void);
 510
 511extern void
 512ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
 513
 514static inline void __attribute__ ((format (printf, 1, 2)))
 515____trace_printk_check_format(const char *fmt, ...)
 516{
 517}
 518#define __trace_printk_check_format(fmt, args...)                       \
 519do {                                                                    \
 520        if (0)                                                          \
 521                ____trace_printk_check_format(fmt, ##args);             \
 522} while (0)
 523
 524/**
 525 * trace_printk - printf formatting in the ftrace buffer
 526 * @fmt: the printf format for printing
 527 *
 528 * Note: __trace_printk is an internal function for trace_printk and
 529 *       the @ip is passed in via the trace_printk macro.
 530 *
 531 * This function allows a kernel developer to debug fast path sections
 532 * that printk is not appropriate for. By scattering in various
 533 * printk like tracing in the code, a developer can quickly see
 534 * where problems are occurring.
 535 *
 536 * This is intended as a debugging tool for the developer only.
 537 * Please refrain from leaving trace_printks scattered around in
 538 * your code.
 539 */
 540
 541#define trace_printk(fmt, args...)                                      \
 542do {                                                                    \
 543        __trace_printk_check_format(fmt, ##args);                       \
 544        if (__builtin_constant_p(fmt)) {                                \
 545                static const char *trace_printk_fmt                     \
 546                  __attribute__((section("__trace_printk_fmt"))) =      \
 547                        __builtin_constant_p(fmt) ? fmt : NULL;         \
 548                                                                        \
 549                __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args);   \
 550        } else                                                          \
 551                __trace_printk(_THIS_IP_, fmt, ##args);         \
 552} while (0)
 553
 554extern int
 555__trace_bprintk(unsigned long ip, const char *fmt, ...)
 556        __attribute__ ((format (printf, 2, 3)));
 557
 558extern int
 559__trace_printk(unsigned long ip, const char *fmt, ...)
 560        __attribute__ ((format (printf, 2, 3)));
 561
 562extern void trace_dump_stack(void);
 563
 564/*
 565 * The double __builtin_constant_p is because gcc will give us an error
 566 * if we try to allocate the static variable to fmt if it is not a
 567 * constant. Even with the outer if statement.
 568 */
 569#define ftrace_vprintk(fmt, vargs)                                      \
 570do {                                                                    \
 571        if (__builtin_constant_p(fmt)) {                                \
 572                static const char *trace_printk_fmt                     \
 573                  __attribute__((section("__trace_printk_fmt"))) =      \
 574                        __builtin_constant_p(fmt) ? fmt : NULL;         \
 575                                                                        \
 576                __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs);  \
 577        } else                                                          \
 578                __ftrace_vprintk(_THIS_IP_, fmt, vargs);                \
 579} while (0)
 580
 581extern int
 582__ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap);
 583
 584extern int
 585__ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
 586
 587extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode);
 588#else
 589static inline void
 590ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
 591static inline int
 592trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
 593
 594static inline void tracing_start(void) { }
 595static inline void tracing_stop(void) { }
 596static inline void ftrace_off_permanent(void) { }
 597static inline void trace_dump_stack(void) { }
 598static inline int
 599trace_printk(const char *fmt, ...)
 600{
 601        return 0;
 602}
 603static inline int
 604ftrace_vprintk(const char *fmt, va_list ap)
 605{
 606        return 0;
 607}
 608static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
 609#endif /* CONFIG_TRACING */
 610
 611/*
 612 *      Display an IP address in readable format.
 613 */
 614
 615#define NIPQUAD(addr) \
 616        ((unsigned char *)&addr)[0], \
 617        ((unsigned char *)&addr)[1], \
 618        ((unsigned char *)&addr)[2], \
 619        ((unsigned char *)&addr)[3]
 620#define NIPQUAD_FMT "%u.%u.%u.%u"
 621
 622/*
 623 * min()/max()/clamp() macros that also do
 624 * strict type-checking.. See the
 625 * "unnecessary" pointer comparison.
 626 */
 627#define min(x, y) ({                            \
 628        typeof(x) _min1 = (x);                  \
 629        typeof(y) _min2 = (y);                  \
 630        (void) (&_min1 == &_min2);              \
 631        _min1 < _min2 ? _min1 : _min2; })
 632
 633#define max(x, y) ({                            \
 634        typeof(x) _max1 = (x);                  \
 635        typeof(y) _max2 = (y);                  \
 636        (void) (&_max1 == &_max2);              \
 637        _max1 > _max2 ? _max1 : _max2; })
 638
 639/**
 640 * clamp - return a value clamped to a given range with strict typechecking
 641 * @val: current value
 642 * @min: minimum allowable value
 643 * @max: maximum allowable value
 644 *
 645 * This macro does strict typechecking of min/max to make sure they are of the
 646 * same type as val.  See the unnecessary pointer comparisons.
 647 */
 648#define clamp(val, min, max) ({                 \
 649        typeof(val) __val = (val);              \
 650        typeof(min) __min = (min);              \
 651        typeof(max) __max = (max);              \
 652        (void) (&__val == &__min);              \
 653        (void) (&__val == &__max);              \
 654        __val = __val < __min ? __min: __val;   \
 655        __val > __max ? __max: __val; })
 656
 657/*
 658 * ..and if you can't take the strict
 659 * types, you can specify one yourself.
 660 *
 661 * Or not use min/max/clamp at all, of course.
 662 */
 663#define min_t(type, x, y) ({                    \
 664        type __min1 = (x);                      \
 665        type __min2 = (y);                      \
 666        __min1 < __min2 ? __min1: __min2; })
 667
 668#define max_t(type, x, y) ({                    \
 669        type __max1 = (x);                      \
 670        type __max2 = (y);                      \
 671        __max1 > __max2 ? __max1: __max2; })
 672
 673/**
 674 * clamp_t - return a value clamped to a given range using a given type
 675 * @type: the type of variable to use
 676 * @val: current value
 677 * @min: minimum allowable value
 678 * @max: maximum allowable value
 679 *
 680 * This macro does no typechecking and uses temporary variables of type
 681 * 'type' to make all the comparisons.
 682 */
 683#define clamp_t(type, val, min, max) ({         \
 684        type __val = (val);                     \
 685        type __min = (min);                     \
 686        type __max = (max);                     \
 687        __val = __val < __min ? __min: __val;   \
 688        __val > __max ? __max: __val; })
 689
 690/**
 691 * clamp_val - return a value clamped to a given range using val's type
 692 * @val: current value
 693 * @min: minimum allowable value
 694 * @max: maximum allowable value
 695 *
 696 * This macro does no typechecking and uses temporary variables of whatever
 697 * type the input argument 'val' is.  This is useful when val is an unsigned
 698 * type and min and max are literals that will otherwise be assigned a signed
 699 * integer type.
 700 */
 701#define clamp_val(val, min, max) ({             \
 702        typeof(val) __val = (val);              \
 703        typeof(val) __min = (min);              \
 704        typeof(val) __max = (max);              \
 705        __val = __val < __min ? __min: __val;   \
 706        __val > __max ? __max: __val; })
 707
 708
 709/*
 710 * swap - swap value of @a and @b
 711 */
 712#define swap(a, b) \
 713        do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
 714
 715/**
 716 * container_of - cast a member of a structure out to the containing structure
 717 * @ptr:        the pointer to the member.
 718 * @type:       the type of the container struct this is embedded in.
 719 * @member:     the name of the member within the struct.
 720 *
 721 */
 722#define container_of(ptr, type, member) ({                      \
 723        const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
 724        (type *)( (char *)__mptr - offsetof(type,member) );})
 725
 726struct sysinfo;
 727extern int do_sysinfo(struct sysinfo *info);
 728
 729#endif /* __KERNEL__ */
 730
 731#ifndef __EXPORTED_HEADERS__
 732#ifndef __KERNEL__
 733#warning Attempt to use kernel headers from user space, see http://kernelnewbies.org/KernelHeaders
 734#endif /* __KERNEL__ */
 735#endif /* __EXPORTED_HEADERS__ */
 736
 737#define SI_LOAD_SHIFT   16
 738struct sysinfo {
 739        long uptime;                    /* Seconds since boot */
 740        unsigned long loads[3];         /* 1, 5, and 15 minute load averages */
 741        unsigned long totalram;         /* Total usable main memory size */
 742        unsigned long freeram;          /* Available memory size */
 743        unsigned long sharedram;        /* Amount of shared memory */
 744        unsigned long bufferram;        /* Memory used by buffers */
 745        unsigned long totalswap;        /* Total swap space size */
 746        unsigned long freeswap;         /* swap space still available */
 747        unsigned short procs;           /* Number of current processes */
 748        unsigned short pad;             /* explicit padding for m68k */
 749        unsigned long totalhigh;        /* Total high memory size */
 750        unsigned long freehigh;         /* Available high memory size */
 751        unsigned int mem_unit;          /* Memory unit size in bytes */
 752        char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
 753};
 754
 755/* Force a compilation error if condition is true */
 756#define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition))
 757
 758/* Force a compilation error if condition is constant and true */
 759#define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)]))
 760
 761/* Force a compilation error if a constant expression is not a power of 2 */
 762#define BUILD_BUG_ON_NOT_POWER_OF_2(n)                  \
 763        BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
 764
 765/* Force a compilation error if condition is true, but also produce a
 766   result (of value 0 and type size_t), so the expression can be used
 767   e.g. in a structure initializer (or where-ever else comma expressions
 768   aren't permitted). */
 769#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
 770#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
 771
 772/* Trap pasters of __FUNCTION__ at compile-time */
 773#define __FUNCTION__ (__func__)
 774
 775/* This helps us to avoid #ifdef CONFIG_NUMA */
 776#ifdef CONFIG_NUMA
 777#define NUMA_BUILD 1
 778#else
 779#define NUMA_BUILD 0
 780#endif
 781
 782/* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
 783#ifdef CONFIG_FTRACE_MCOUNT_RECORD
 784# define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD
 785#endif
 786
 787#endif
 788
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