include/linux/kernel.h

   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/printk.h>
  21 #include <linux/dynamic_debug.h>
  22 #include <asm/byteorder.h>
  23 #include <asm/bug.h>
  24
  25 #define USHRT_MAX       ((u16)(~0U))
  26 #define SHRT_MAX        ((s16)(USHRT_MAX>>1))
  27 #define SHRT_MIN        ((s16)(-SHRT_MAX - 1))
  28 #define INT_MAX         ((int)(~0U>>1))
  29 #define INT_MIN         (-INT_MAX - 1)
  30 #define UINT_MAX        (~0U)
  31 #define LONG_MAX        ((long)(~0UL>>1))
  32 #define LONG_MIN        (-LONG_MAX - 1)
  33 #define ULONG_MAX       (~0UL)
  34 #define LLONG_MAX       ((long long)(~0ULL>>1))
  35 #define LLONG_MIN       (-LLONG_MAX - 1)
  36 #define ULLONG_MAX      (~0ULL)
  37
  38 #define STACK_MAGIC     0xdeadbeef
  39
  40 #define ALIGN(x, a)             __ALIGN_KERNEL((x), (a))
  41 #define __ALIGN_MASK(x, mask)   __ALIGN_KERNEL_MASK((x), (mask))
  42 #define PTR_ALIGN(p, a)         ((typeof(p))ALIGN((unsigned long)(p), (a)))
  43 #define IS_ALIGNED(x, a)                (((x) & ((typeof(x))(a) - 1)) == 0)
  44
  45 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
  46
  47 /*
  48  * This looks more complex than it should be. But we need to
  49  * get the type for the ~ right in round_down (it needs to be
  50  * as wide as the result!), and we want to evaluate the macro
  51  * arguments just once each.
  52  */
  53 #define __round_mask(x, y) ((__typeof__(x))((y)-1))
  54 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
  55 #define round_down(x, y) ((x) & ~__round_mask(x, y))
  56
  57 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
  58 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
  59
  60 /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */
  61 #define roundup(x, y) (                                 \
  62 {                                                       \
  63         const typeof(y) __y = y;                        \
  64         (((x) + (__y - 1)) / __y) * __y;                \
  65 }                                                       \
  66 )
  67 #define rounddown(x, y) (                               \
  68 {                                                       \
  69         typeof(x) __x = (x);                            \
  70         __x - (__x % (y));                              \
  71 }                                                       \
  72 )
  73 #define DIV_ROUND_CLOSEST(x, divisor)(                  \
  74 {                                                       \
  75         typeof(divisor) __divisor = divisor;            \
  76         (((x) + ((__divisor) / 2)) / (__divisor));      \
  77 }                                                       \
  78 )
  79
  80 #define _RET_IP_                (unsigned long)__builtin_return_address(0)
  81 #define _THIS_IP_  ({ __label__ __here; __here: (unsigned long)&&__here; })
  82
  83 #ifdef CONFIG_LBDAF
  84 # include <asm/div64.h>
  85 # define sector_div(a, b) do_div(a, b)
  86 #else
  87 # define sector_div(n, b)( \
  88 { \
  89         int _res; \
  90         _res = (n) % (b); \
  91         (n) /= (b); \
  92         _res; \
  93 } \
  94 )
  95 #endif
  96
  97 /**
  98  * upper_32_bits - return bits 32-63 of a number
  99  * @n: the number we're accessing
 100  *
 101  * A basic shift-right of a 64- or 32-bit quantity.  Use this to suppress
 102  * the "right shift count >= width of type" warning when that quantity is
 103  * 32-bits.
 104  */
 105 #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
 106
 107 /**
 108  * lower_32_bits - return bits 0-31 of a number
 109  * @n: the number we're accessing
 110  */
 111 #define lower_32_bits(n) ((u32)(n))
 112
 113 struct completion;
 114 struct pt_regs;
 115 struct user;
 116
 117 #ifdef CONFIG_PREEMPT_VOLUNTARY
 118 extern int _cond_resched(void);
 119 # define might_resched() _cond_resched()
 120 #else
 121 # define might_resched() do { } while (0)
 122 #endif
 123
 124 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
 125   void __might_sleep(const char *file, int line, int preempt_offset);
 126 /**
 127  * might_sleep - annotation for functions that can sleep
 128  *
 129  * this macro will print a stack trace if it is executed in an atomic
 130  * context (spinlock, irq-handler, ...).
 131  *
 132  * This is a useful debugging help to be able to catch problems early and not
 133  * be bitten later when the calling function happens to sleep when it is not
 134  * supposed to.
 135  */
 136 # define might_sleep() \
 137         do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0)
 138 #else
 139   static inline void __might_sleep(const char *file, int line,
 140                                    int preempt_offset) { }
 141 # define might_sleep() do { might_resched(); } while (0)
 142 #endif
 143
 144 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
 145
 146 #define abs(x) ({                               \
 147                 long __x = (x);                 \
 148                 (__x < 0) ? -__x : __x;         \
 149         })
 150
 151 #define abs64(x) ({                             \
 152                 s64 __x = (x);                  \
 153                 (__x < 0) ? -__x : __x;         \
 154         })
 155
 156 #ifdef CONFIG_PROVE_LOCKING
 157 void might_fault(void);
 158 #else
 159 static inline void might_fault(void)
 160 {
 161         might_sleep();
 162 }
 163 #endif
 164
 165 extern struct atomic_notifier_head panic_notifier_list;
 166 extern long (*panic_blink)(int state);
 167 NORET_TYPE void panic(const char * fmt, ...)
 168         __attribute__ ((NORET_AND format (printf, 1, 2))) __cold;
 169 extern void oops_enter(void);
 170 extern void oops_exit(void);
 171 void print_oops_end_marker(void);
 172 extern int oops_may_print(void);
 173 NORET_TYPE void do_exit(long error_code)
 174         ATTRIB_NORET;
 175 NORET_TYPE void complete_and_exit(struct completion *, long)
 176         ATTRIB_NORET;
 177 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
 178 extern long simple_strtol(const char *,char **,unsigned int);
 179 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
 180 extern long long simple_strtoll(const char *,char **,unsigned int);
 181 extern int __must_check strict_strtoul(const char *, unsigned int, unsigned long *);
 182 extern int __must_check strict_strtol(const char *, unsigned int, long *);
 183 extern int __must_check strict_strtoull(const char *, unsigned int, unsigned long long *);
 184 extern int __must_check strict_strtoll(const char *, unsigned int, long long *);
 185 extern int sprintf(char * buf, const char * fmt, ...)
 186         __attribute__ ((format (printf, 2, 3)));
 187 extern int vsprintf(char *buf, const char *, va_list)
 188         __attribute__ ((format (printf, 2, 0)));
 189 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
 190         __attribute__ ((format (printf, 3, 4)));
 191 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
 192         __attribute__ ((format (printf, 3, 0)));
 193 extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
 194         __attribute__ ((format (printf, 3, 4)));
 195 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
 196         __attribute__ ((format (printf, 3, 0)));
 197 extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
 198         __attribute__ ((format (printf, 2, 3)));
 199 extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
 200
 201 extern int sscanf(const char *, const char *, ...)
 202         __attribute__ ((format (scanf, 2, 3)));
 203 extern int vsscanf(const char *, const char *, va_list)
 204         __attribute__ ((format (scanf, 2, 0)));
 205
 206 extern int get_option(char **str, int *pint);
 207 extern char *get_options(const char *str, int nints, int *ints);
 208 extern unsigned long long memparse(const char *ptr, char **retptr);
 209
 210 extern int core_kernel_text(unsigned long addr);
 211 extern int __kernel_text_address(unsigned long addr);
 212 extern int kernel_text_address(unsigned long addr);
 213 extern int func_ptr_is_kernel_text(void *ptr);
 214
 215 struct pid;
 216 extern struct pid *session_of_pgrp(struct pid *pgrp);
 217
 218 unsigned long int_sqrt(unsigned long);
 219
 220 extern void bust_spinlocks(int yes);
 221 extern void wake_up_klogd(void);
 222 extern int oops_in_progress;            /* If set, an oops, panic(), BUG() or die() is in progress */
 223 extern int panic_timeout;
 224 extern int panic_on_oops;
 225 extern int panic_on_unrecovered_nmi;
 226 extern int panic_on_io_nmi;
 227 extern const char *print_tainted(void);
 228 extern void add_taint(unsigned flag);
 229 extern int test_taint(unsigned flag);
 230 extern unsigned long get_taint(void);
 231 extern int root_mountflags;
 232
 233 /* Values used for system_state */
 234 extern enum system_states {
 235         SYSTEM_BOOTING,
 236         SYSTEM_RUNNING,
 237         SYSTEM_HALT,
 238         SYSTEM_POWER_OFF,
 239         SYSTEM_RESTART,
 240         SYSTEM_SUSPEND_DISK,
 241 } system_state;
 242
 243 #define TAINT_PROPRIETARY_MODULE        0
 244 #define TAINT_FORCED_MODULE             1
 245 #define TAINT_UNSAFE_SMP                2
 246 #define TAINT_FORCED_RMMOD              3
 247 #define TAINT_MACHINE_CHECK             4
 248 #define TAINT_BAD_PAGE                  5
 249 #define TAINT_USER                      6
 250 #define TAINT_DIE                       7
 251 #define TAINT_OVERRIDDEN_ACPI_TABLE     8
 252 #define TAINT_WARN                      9
 253 #define TAINT_CRAP                      10
 254 #define TAINT_FIRMWARE_WORKAROUND       11
 255
 256 extern const char hex_asc[];
 257 #define hex_asc_lo(x)   hex_asc[((x) & 0x0f)]
 258 #define hex_asc_hi(x)   hex_asc[((x) & 0xf0) >> 4]
 259
 260 static inline char *pack_hex_byte(char *buf, u8 byte)
 261 {
 262         *buf++ = hex_asc_hi(byte);
 263         *buf++ = hex_asc_lo(byte);
 264         return buf;
 265 }
 266
 267 extern int hex_to_bin(char ch);
 268 extern void hex2bin(u8 *dst, const char *src, size_t count);
 269
 270 /*
 271  * General tracing related utility functions - trace_printk(),
 272  * tracing_on/tracing_off and tracing_start()/tracing_stop
 273  *
 274  * Use tracing_on/tracing_off when you want to quickly turn on or off
 275  * tracing. It simply enables or disables the recording of the trace events.
 276  * This also corresponds to the user space /sys/kernel/debug/tracing/tracing_on
 277  * file, which gives a means for the kernel and userspace to interact.
 278  * Place a tracing_off() in the kernel where you want tracing to end.
 279  * From user space, examine the trace, and then echo 1 > tracing_on
 280  * to continue tracing.
 281  *
 282  * tracing_stop/tracing_start has slightly more overhead. It is used
 283  * by things like suspend to ram where disabling the recording of the
 284  * trace is not enough, but tracing must actually stop because things
 285  * like calling smp_processor_id() may crash the system.
 286  *
 287  * Most likely, you want to use tracing_on/tracing_off.
 288  */
 289 #ifdef CONFIG_RING_BUFFER
 290 void tracing_on(void);
 291 void tracing_off(void);
 292 /* trace_off_permanent stops recording with no way to bring it back */
 293 void tracing_off_permanent(void);
 294 int tracing_is_on(void);
 295 #else
 296 static inline void tracing_on(void) { }
 297 static inline void tracing_off(void) { }
 298 static inline void tracing_off_permanent(void) { }
 299 static inline int tracing_is_on(void) { return 0; }
 300 #endif
 301
 302 enum ftrace_dump_mode {
 303         DUMP_NONE,
 304         DUMP_ALL,
 305         DUMP_ORIG,
 306 };
 307
 308 #ifdef CONFIG_TRACING
 309 extern void tracing_start(void);
 310 extern void tracing_stop(void);
 311 extern void ftrace_off_permanent(void);
 312
 313 static inline void __attribute__ ((format (printf, 1, 2)))
 314 ____trace_printk_check_format(const char *fmt, ...)
 315 {
 316 }
 317 #define __trace_printk_check_format(fmt, args...)                       \
 318 do {                                                                    \
 319         if (0)                                                          \
 320                 ____trace_printk_check_format(fmt, ##args);             \
 321 } while (0)
 322
 323 /**
 324  * trace_printk - printf formatting in the ftrace buffer
 325  * @fmt: the printf format for printing
 326  *
 327  * Note: __trace_printk is an internal function for trace_printk and
 328  *       the @ip is passed in via the trace_printk macro.
 329  *
 330  * This function allows a kernel developer to debug fast path sections
 331  * that printk is not appropriate for. By scattering in various
 332  * printk like tracing in the code, a developer can quickly see
 333  * where problems are occurring.
 334  *
 335  * This is intended as a debugging tool for the developer only.
 336  * Please refrain from leaving trace_printks scattered around in
 337  * your code.
 338  */
 339
 340 #define trace_printk(fmt, args...)                                      \
 341 do {                                                                    \
 342         __trace_printk_check_format(fmt, ##args);                       \
 343         if (__builtin_constant_p(fmt)) {                                \
 344                 static const char *trace_printk_fmt                     \
 345                   __attribute__((section("__trace_printk_fmt"))) =      \
 346                         __builtin_constant_p(fmt) ? fmt : NULL;         \
 347                                                                         \
 348                 __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args);   \
 349         } else                                                          \
 350                 __trace_printk(_THIS_IP_, fmt, ##args);         \
 351 } while (0)
 352
 353 extern int
 354 __trace_bprintk(unsigned long ip, const char *fmt, ...)
 355         __attribute__ ((format (printf, 2, 3)));
 356
 357 extern int
 358 __trace_printk(unsigned long ip, const char *fmt, ...)
 359         __attribute__ ((format (printf, 2, 3)));
 360
 361 extern void trace_dump_stack(void);
 362
 363 /*
 364  * The double __builtin_constant_p is because gcc will give us an error
 365  * if we try to allocate the static variable to fmt if it is not a
 366  * constant. Even with the outer if statement.
 367  */
 368 #define ftrace_vprintk(fmt, vargs)                                      \
 369 do {                                                                    \
 370         if (__builtin_constant_p(fmt)) {                                \
 371                 static const char *trace_printk_fmt                     \
 372                   __attribute__((section("__trace_printk_fmt"))) =      \
 373                         __builtin_constant_p(fmt) ? fmt : NULL;         \
 374                                                                         \
 375                 __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs);  \
 376         } else                                                          \
 377                 __ftrace_vprintk(_THIS_IP_, fmt, vargs);                \
 378 } while (0)
 379
 380 extern int
 381 __ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap);
 382
 383 extern int
 384 __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
 385
 386 extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode);
 387 #else
 388 static inline int
 389 trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
 390
 391 static inline void tracing_start(void) { }
 392 static inline void tracing_stop(void) { }
 393 static inline void ftrace_off_permanent(void) { }
 394 static inline void trace_dump_stack(void) { }
 395 static inline int
 396 trace_printk(const char *fmt, ...)
 397 {
 398         return 0;
 399 }
 400 static inline int
 401 ftrace_vprintk(const char *fmt, va_list ap)
 402 {
 403         return 0;
 404 }
 405 static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
 406 #endif /* CONFIG_TRACING */
 407
 408 /*
 409  * min()/max()/clamp() macros that also do
 410  * strict type-checking.. See the
 411  * "unnecessary" pointer comparison.
 412  */
 413 #define min(x, y) ({                            \
 414         typeof(x) _min1 = (x);                  \
 415         typeof(y) _min2 = (y);                  \
 416         (void) (&_min1 == &_min2);              \
 417         _min1 < _min2 ? _min1 : _min2; })
 418
 419 #define max(x, y) ({                            \
 420         typeof(x) _max1 = (x);                  \
 421         typeof(y) _max2 = (y);                  \
 422         (void) (&_max1 == &_max2);              \
 423         _max1 > _max2 ? _max1 : _max2; })
 424
 425 #define min3(x, y, z) ({                        \
 426         typeof(x) _min1 = (x);                  \
 427         typeof(y) _min2 = (y);                  \
 428         typeof(z) _min3 = (z);                  \
 429         (void) (&_min1 == &_min2);              \
 430         (void) (&_min1 == &_min3);              \
 431         _min1 < _min2 ? (_min1 < _min3 ? _min1 : _min3) : \
 432                 (_min2 < _min3 ? _min2 : _min3); })
 433
 434 #define max3(x, y, z) ({                        \
 435         typeof(x) _max1 = (x);                  \
 436         typeof(y) _max2 = (y);                  \
 437         typeof(z) _max3 = (z);                  \
 438         (void) (&_max1 == &_max2);              \
 439         (void) (&_max1 == &_max3);              \
 440         _max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \
 441                 (_max2 > _max3 ? _max2 : _max3); })
 442
 443 /**
 444  * min_not_zero - return the minimum that is _not_ zero, unless both are zero
 445  * @x: value1
 446  * @y: value2
 447  */
 448 #define min_not_zero(x, y) ({                   \
 449         typeof(x) __x = (x);                    \
 450         typeof(y) __y = (y);                    \
 451         __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); })
 452
 453 /**
 454  * clamp - return a value clamped to a given range with strict typechecking
 455  * @val: current value
 456  * @min: minimum allowable value
 457  * @max: maximum allowable value
 458  *
 459  * This macro does strict typechecking of min/max to make sure they are of the
 460  * same type as val.  See the unnecessary pointer comparisons.
 461  */
 462 #define clamp(val, min, max) ({                 \
 463         typeof(val) __val = (val);              \
 464         typeof(min) __min = (min);              \
 465         typeof(max) __max = (max);              \
 466         (void) (&__val == &__min);              \
 467         (void) (&__val == &__max);              \
 468         __val = __val < __min ? __min: __val;   \
 469         __val > __max ? __max: __val; })
 470
 471 /*
 472  * ..and if you can't take the strict
 473  * types, you can specify one yourself.
 474  *
 475  * Or not use min/max/clamp at all, of course.
 476  */
 477 #define min_t(type, x, y) ({                    \
 478         type __min1 = (x);                      \
 479         type __min2 = (y);                      \
 480         __min1 < __min2 ? __min1: __min2; })
 481
 482 #define max_t(type, x, y) ({                    \
 483         type __max1 = (x);                      \
 484         type __max2 = (y);                      \
 485         __max1 > __max2 ? __max1: __max2; })
 486
 487 /**
 488  * clamp_t - return a value clamped to a given range using a given type
 489  * @type: the type of variable to use
 490  * @val: current value
 491  * @min: minimum allowable value
 492  * @max: maximum allowable value
 493  *
 494  * This macro does no typechecking and uses temporary variables of type
 495  * 'type' to make all the comparisons.
 496  */
 497 #define clamp_t(type, val, min, max) ({         \
 498         type __val = (val);                     \
 499         type __min = (min);                     \
 500         type __max = (max);                     \
 501         __val = __val < __min ? __min: __val;   \
 502         __val > __max ? __max: __val; })
 503
 504 /**
 505  * clamp_val - return a value clamped to a given range using val's type
 506  * @val: current value
 507  * @min: minimum allowable value
 508  * @max: maximum allowable value
 509  *
 510  * This macro does no typechecking and uses temporary variables of whatever
 511  * type the input argument 'val' is.  This is useful when val is an unsigned
 512  * type and min and max are literals that will otherwise be assigned a signed
 513  * integer type.
 514  */
 515 #define clamp_val(val, min, max) ({             \
 516         typeof(val) __val = (val);              \
 517         typeof(val) __min = (min);              \
 518         typeof(val) __max = (max);              \
 519         __val = __val < __min ? __min: __val;   \
 520         __val > __max ? __max: __val; })
 521
 522
 523 /*
 524  * swap - swap value of @a and @b
 525  */
 526 #define swap(a, b) \
 527         do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
 528
 529 /**
 530  * container_of - cast a member of a structure out to the containing structure
 531  * @ptr:        the pointer to the member.
 532  * @type:       the type of the container struct this is embedded in.
 533  * @member:     the name of the member within the struct.
 534  *
 535  */
 536 #define container_of(ptr, type, member) ({                      \
 537         const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
 538         (type *)( (char *)__mptr - offsetof(type,member) );})
 539
 540 struct sysinfo;
 541 extern int do_sysinfo(struct sysinfo *info);
 542
 543 #endif /* __KERNEL__ */
 544
 545 #define SI_LOAD_SHIFT   16
 546 struct sysinfo {
 547         long uptime;                    /* Seconds since boot */
 548         unsigned long loads[3];         /* 1, 5, and 15 minute load averages */
 549         unsigned long totalram;         /* Total usable main memory size */
 550         unsigned long freeram;          /* Available memory size */
 551         unsigned long sharedram;        /* Amount of shared memory */
 552         unsigned long bufferram;        /* Memory used by buffers */
 553         unsigned long totalswap;        /* Total swap space size */
 554         unsigned long freeswap;         /* swap space still available */
 555         unsigned short procs;           /* Number of current processes */
 556         unsigned short pad;             /* explicit padding for m68k */
 557         unsigned long totalhigh;        /* Total high memory size */
 558         unsigned long freehigh;         /* Available high memory size */
 559         unsigned int mem_unit;          /* Memory unit size in bytes */
 560         char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
 561 };
 562
 563 /* Force a compilation error if condition is true */
 564 #define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition))
 565
 566 /* Force a compilation error if condition is constant and true */
 567 #define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)]))
 568
 569 /* Force a compilation error if a constant expression is not a power of 2 */
 570 #define BUILD_BUG_ON_NOT_POWER_OF_2(n)                  \
 571         BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
 572
 573 /* Force a compilation error if condition is true, but also produce a
 574    result (of value 0 and type size_t), so the expression can be used
 575    e.g. in a structure initializer (or where-ever else comma expressions
 576    aren't permitted). */
 577 #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
 578 #define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
 579
 580 /* Trap pasters of __FUNCTION__ at compile-time */
 581 #define __FUNCTION__ (__func__)
 582
 583 /* This helps us to avoid #ifdef CONFIG_NUMA */
 584 #ifdef CONFIG_NUMA
 585 #define NUMA_BUILD 1
 586 #else
 587 #define NUMA_BUILD 0
 588 #endif
 589
 590 /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
 591 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 592 # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD
 593 #endif
 594
 595 #endif