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  1. #ifndef __LINUX_COMPILER_H
  2. #define __LINUX_COMPILER_H
  3.  
  4. #ifndef __ASSEMBLY__
  5.  
  6. #ifdef __CHECKER__
  7. # define __user         __attribute__((noderef, address_space(1)))
  8. # define __kernel       __attribute__((address_space(0)))
  9. # define __safe         __attribute__((safe))
  10. # define __force        __attribute__((force))
  11. # define __nocast       __attribute__((nocast))
  12. # define __iomem        __attribute__((noderef, address_space(2)))
  13. # define __acquires(x)  __attribute__((context(x,0,1)))
  14. # define __releases(x)  __attribute__((context(x,1,0)))
  15. # define __acquire(x)   __context__(x,1)
  16. # define __release(x)   __context__(x,-1)
  17. # define __cond_lock(x,c)       ((c) ? ({ __acquire(x); 1; }) : 0)
  18. # define __percpu       __attribute__((noderef, address_space(3)))
  19. #ifdef CONFIG_SPARSE_RCU_POINTER
  20. # define __rcu          __attribute__((noderef, address_space(4)))
  21. #else
  22. # define __rcu
  23. #endif
  24. extern void __chk_user_ptr(const volatile void __user *);
  25. extern void __chk_io_ptr(const volatile void __iomem *);
  26. #else
  27. # define __user
  28. # define __kernel
  29. # define __safe
  30. # define __force
  31. # define __nocast
  32. # define __iomem
  33. # define __chk_user_ptr(x) (void)0
  34. # define __chk_io_ptr(x) (void)0
  35. # define __builtin_warning(x, y...) (1)
  36. # define __acquires(x)
  37. # define __releases(x)
  38. # define __acquire(x) (void)0
  39. # define __release(x) (void)0
  40. # define __cond_lock(x,c) (c)
  41. # define __percpu
  42. # define __rcu
  43. #endif
  44.  
  45. #ifdef __KERNEL__
  46.  
  47. #ifdef __GNUC__
  48. #include <linux/compiler-gcc.h>
  49. #endif
  50.  
  51. #define notrace __attribute__((no_instrument_function))
  52.  
  53. /* Intel compiler defines __GNUC__. So we will overwrite implementations
  54.  * coming from above header files here
  55.  */
  56. #ifdef __INTEL_COMPILER
  57. # include <linux/compiler-intel.h>
  58. #endif
  59.  
  60. /*
  61.  * Generic compiler-dependent macros required for kernel
  62.  * build go below this comment. Actual compiler/compiler version
  63.  * specific implementations come from the above header files
  64.  */
  65.  
  66. struct ftrace_branch_data {
  67.         const char *func;
  68.         const char *file;
  69.         unsigned line;
  70.         union {
  71.                 struct {
  72.                         unsigned long correct;
  73.                         unsigned long incorrect;
  74.                 };
  75.                 struct {
  76.                         unsigned long miss;
  77.                         unsigned long hit;
  78.                 };
  79.                 unsigned long miss_hit[2];
  80.         };
  81. };
  82.  
  83. /*
  84.  * Note: DISABLE_BRANCH_PROFILING can be used by special lowlevel code
  85.  * to disable branch tracing on a per file basis.
  86.  */
  87. #if defined(CONFIG_TRACE_BRANCH_PROFILING) \
  88.     && !defined(DISABLE_BRANCH_PROFILING) && !defined(__CHECKER__)
  89. void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
  90.  
  91. #define likely_notrace(x)       __builtin_expect(!!(x), 1)
  92. #define unlikely_notrace(x)     __builtin_expect(!!(x), 0)
  93.  
  94. #define __branch_check__(x, expect) ({                                  \
  95.                         int ______r;                                    \
  96.                         static struct ftrace_branch_data                \
  97.                                 __attribute__((__aligned__(4)))         \
  98.                                 __attribute__((section("_ftrace_annotated_branch"))) \
  99.                                 ______f = {                             \
  100.                                 .func = __func__,                       \
  101.                                 .file = __FILE__,                       \
  102.                                 .line = __LINE__,                       \
  103.                         };                                              \
  104.                         ______r = likely_notrace(x);                    \
  105.                         ftrace_likely_update(&______f, ______r, expect); \
  106.                         ______r;                                        \
  107.                 })
  108.  
  109. /*
  110.  * Using __builtin_constant_p(x) to ignore cases where the return
  111.  * value is always the same.  This idea is taken from a similar patch
  112.  * written by Daniel Walker.
  113.  */
  114. # ifndef likely
  115. #  define likely(x)     (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 1))
  116. # endif
  117. # ifndef unlikely
  118. #  define unlikely(x)   (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
  119. # endif
  120.  
  121. #ifdef CONFIG_PROFILE_ALL_BRANCHES
  122. /*
  123.  * "Define 'is'", Bill Clinton
  124.  * "Define 'if'", Steven Rostedt
  125.  */
  126. #define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
  127. #define __trace_if(cond) \
  128.         if (__builtin_constant_p((cond)) ? !!(cond) :                   \
  129.         ({                                                              \
  130.                 int ______r;                                            \
  131.                 static struct ftrace_branch_data                        \
  132.                         __attribute__((__aligned__(4)))                 \
  133.                         __attribute__((section("_ftrace_branch")))      \
  134.                         ______f = {                                     \
  135.                                 .func = __func__,                       \
  136.                                 .file = __FILE__,                       \
  137.                                 .line = __LINE__,                       \
  138.                         };                                              \
  139.                 ______r = !!(cond);                                     \
  140.                 ______f.miss_hit[______r]++;                                    \
  141.                 ______r;                                                \
  142.         }))
  143. #endif /* CONFIG_PROFILE_ALL_BRANCHES */
  144.  
  145. #else
  146. # define likely(x)      __builtin_expect(!!(x), 1)
  147. # define unlikely(x)    __builtin_expect(!!(x), 0)
  148. #endif
  149.  
  150. /* Optimization barrier */
  151. #ifndef barrier
  152. # define barrier() __memory_barrier()
  153. #endif
  154.  
  155. /* Unreachable code */
  156. #ifndef unreachable
  157. # define unreachable() do { } while (1)
  158. #endif
  159.  
  160. #ifndef RELOC_HIDE
  161. # define RELOC_HIDE(ptr, off)                                   \
  162.   ({ unsigned long __ptr;                                       \
  163.      __ptr = (unsigned long) (ptr);                             \
  164.     (typeof(ptr)) (__ptr + (off)); })
  165. #endif
  166.  
  167. #endif /* __KERNEL__ */
  168.  
  169. #endif /* __ASSEMBLY__ */
  170.  
  171. #ifdef __KERNEL__
  172. /*
  173.  * Allow us to mark functions as 'deprecated' and have gcc emit a nice
  174.  * warning for each use, in hopes of speeding the functions removal.
  175.  * Usage is:
  176.  *              int __deprecated foo(void)
  177.  */
  178. #ifndef __deprecated
  179. # define __deprecated           /* unimplemented */
  180. #endif
  181.  
  182. #ifdef MODULE
  183. #define __deprecated_for_modules __deprecated
  184. #else
  185. #define __deprecated_for_modules
  186. #endif
  187.  
  188. #ifndef __must_check
  189. #define __must_check
  190. #endif
  191.  
  192. #ifndef CONFIG_ENABLE_MUST_CHECK
  193. #undef __must_check
  194. #define __must_check
  195. #endif
  196. #ifndef CONFIG_ENABLE_WARN_DEPRECATED
  197. #undef __deprecated
  198. #undef __deprecated_for_modules
  199. #define __deprecated
  200. #define __deprecated_for_modules
  201. #endif
  202.  
  203. /*
  204.  * Allow us to avoid 'defined but not used' warnings on functions and data,
  205.  * as well as force them to be emitted to the assembly file.
  206.  *
  207.  * As of gcc 3.4, static functions that are not marked with attribute((used))
  208.  * may be elided from the assembly file.  As of gcc 3.4, static data not so
  209.  * marked will not be elided, but this may change in a future gcc version.
  210.  *
  211.  * NOTE: Because distributions shipped with a backported unit-at-a-time
  212.  * compiler in gcc 3.3, we must define __used to be __attribute__((used))
  213.  * for gcc >=3.3 instead of 3.4.
  214.  *
  215.  * In prior versions of gcc, such functions and data would be emitted, but
  216.  * would be warned about except with attribute((unused)).
  217.  *
  218.  * Mark functions that are referenced only in inline assembly as __used so
  219.  * the code is emitted even though it appears to be unreferenced.
  220.  */
  221. #ifndef __used
  222. # define __used                 /* unimplemented */
  223. #endif
  224.  
  225. #ifndef __maybe_unused
  226. # define __maybe_unused         /* unimplemented */
  227. #endif
  228.  
  229. #ifndef __always_unused
  230. # define __always_unused        /* unimplemented */
  231. #endif
  232.  
  233. #ifndef noinline
  234. #define noinline
  235. #endif
  236.  
  237. /*
  238.  * Rather then using noinline to prevent stack consumption, use
  239.  * noinline_for_stack instead.  For documentation reasons.
  240.  */
  241. #define noinline_for_stack noinline
  242.  
  243. #ifndef __always_inline
  244. #define __always_inline inline
  245. #endif
  246.  
  247. #endif /* __KERNEL__ */
  248.  
  249. /*
  250.  * From the GCC manual:
  251.  *
  252.  * Many functions do not examine any values except their arguments,
  253.  * and have no effects except the return value.  Basically this is
  254.  * just slightly more strict class than the `pure' attribute above,
  255.  * since function is not allowed to read global memory.
  256.  *
  257.  * Note that a function that has pointer arguments and examines the
  258.  * data pointed to must _not_ be declared `const'.  Likewise, a
  259.  * function that calls a non-`const' function usually must not be
  260.  * `const'.  It does not make sense for a `const' function to return
  261.  * `void'.
  262.  */
  263. #ifndef __attribute_const__
  264. # define __attribute_const__    /* unimplemented */
  265. #endif
  266.  
  267. /*
  268.  * Tell gcc if a function is cold. The compiler will assume any path
  269.  * directly leading to the call is unlikely.
  270.  */
  271.  
  272. #ifndef __cold
  273. #define __cold
  274. #endif
  275.  
  276. /* Simple shorthand for a section definition */
  277. #ifndef __section
  278. # define __section(S) __attribute__ ((__section__(#S)))
  279. #endif
  280.  
  281. #ifndef __visible
  282. #define __visible
  283. #endif
  284.  
  285. /* Are two types/vars the same type (ignoring qualifiers)? */
  286. #ifndef __same_type
  287. # define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
  288. #endif
  289.  
  290. /* Compile time object size, -1 for unknown */
  291. #ifndef __compiletime_object_size
  292. # define __compiletime_object_size(obj) -1
  293. #endif
  294. #ifndef __compiletime_warning
  295. # define __compiletime_warning(message)
  296. #endif
  297. #ifndef __compiletime_error
  298. # define __compiletime_error(message)
  299. #endif
  300. #ifndef __linktime_error
  301. # define __linktime_error(message)
  302. #endif
  303. /*
  304.  * Prevent the compiler from merging or refetching accesses.  The compiler
  305.  * is also forbidden from reordering successive instances of ACCESS_ONCE(),
  306.  * but only when the compiler is aware of some particular ordering.  One way
  307.  * to make the compiler aware of ordering is to put the two invocations of
  308.  * ACCESS_ONCE() in different C statements.
  309.  *
  310.  * This macro does absolutely -nothing- to prevent the CPU from reordering,
  311.  * merging, or refetching absolutely anything at any time.  Its main intended
  312.  * use is to mediate communication between process-level code and irq/NMI
  313.  * handlers, all running on the same CPU.
  314.  */
  315. #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
  316.  
  317. #endif /* __LINUX_COMPILER_H */
  318.