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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 __must_hold(x) __attribute__((context(x,1,1)))
  14. # define __acquires(x)  __attribute__((context(x,0,1)))
  15. # define __releases(x)  __attribute__((context(x,1,0)))
  16. # define __acquire(x)   __context__(x,1)
  17. # define __release(x)   __context__(x,-1)
  18. # define __cond_lock(x,c)       ((c) ? ({ __acquire(x); 1; }) : 0)
  19. # define __percpu       __attribute__((noderef, address_space(3)))
  20. #ifdef CONFIG_SPARSE_RCU_POINTER
  21. # define __rcu          __attribute__((noderef, address_space(4)))
  22. #else
  23. # define __rcu
  24. #endif
  25. extern void __chk_user_ptr(const volatile void __user *);
  26. extern void __chk_io_ptr(const volatile void __iomem *);
  27. #else
  28. # define __user
  29. # define __kernel
  30. # define __safe
  31. # define __force
  32. # define __nocast
  33. # define __iomem
  34. # define __chk_user_ptr(x) (void)0
  35. # define __chk_io_ptr(x) (void)0
  36. # define __builtin_warning(x, y...) (1)
  37. # define __must_hold(x)
  38. # define __acquires(x)
  39. # define __releases(x)
  40. # define __acquire(x) (void)0
  41. # define __release(x) (void)0
  42. # define __cond_lock(x,c) (c)
  43. # define __percpu
  44. # define __rcu
  45. #endif
  46.  
  47. /* Indirect macros required for expanded argument pasting, eg. __LINE__. */
  48. #define ___PASTE(a,b) a##b
  49. #define __PASTE(a,b) ___PASTE(a,b)
  50.  
  51. #ifdef __KERNEL__
  52.  
  53. #ifdef __GNUC__
  54. #include <linux/compiler-gcc.h>
  55. #endif
  56.  
  57. #define notrace __attribute__((no_instrument_function))
  58.  
  59. /* Intel compiler defines __GNUC__. So we will overwrite implementations
  60.  * coming from above header files here
  61.  */
  62. #ifdef __INTEL_COMPILER
  63. # include <linux/compiler-intel.h>
  64. #endif
  65.  
  66. /*
  67.  * Generic compiler-dependent macros required for kernel
  68.  * build go below this comment. Actual compiler/compiler version
  69.  * specific implementations come from the above header files
  70.  */
  71.  
  72. struct ftrace_branch_data {
  73.         const char *func;
  74.         const char *file;
  75.         unsigned line;
  76.         union {
  77.                 struct {
  78.                         unsigned long correct;
  79.                         unsigned long incorrect;
  80.                 };
  81.                 struct {
  82.                         unsigned long miss;
  83.                         unsigned long hit;
  84.                 };
  85.                 unsigned long miss_hit[2];
  86.         };
  87. };
  88.  
  89. /*
  90.  * Note: DISABLE_BRANCH_PROFILING can be used by special lowlevel code
  91.  * to disable branch tracing on a per file basis.
  92.  */
  93. #if defined(CONFIG_TRACE_BRANCH_PROFILING) \
  94.     && !defined(DISABLE_BRANCH_PROFILING) && !defined(__CHECKER__)
  95. void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
  96.  
  97. #define likely_notrace(x)       __builtin_expect(!!(x), 1)
  98. #define unlikely_notrace(x)     __builtin_expect(!!(x), 0)
  99.  
  100. #define __branch_check__(x, expect) ({                                  \
  101.                         int ______r;                                    \
  102.                         static struct ftrace_branch_data                \
  103.                                 __attribute__((__aligned__(4)))         \
  104.                                 __attribute__((section("_ftrace_annotated_branch"))) \
  105.                                 ______f = {                             \
  106.                                 .func = __func__,                       \
  107.                                 .file = __FILE__,                       \
  108.                                 .line = __LINE__,                       \
  109.                         };                                              \
  110.                         ______r = likely_notrace(x);                    \
  111.                         ftrace_likely_update(&______f, ______r, expect); \
  112.                         ______r;                                        \
  113.                 })
  114.  
  115. /*
  116.  * Using __builtin_constant_p(x) to ignore cases where the return
  117.  * value is always the same.  This idea is taken from a similar patch
  118.  * written by Daniel Walker.
  119.  */
  120. # ifndef likely
  121. #  define likely(x)     (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 1))
  122. # endif
  123. # ifndef unlikely
  124. #  define unlikely(x)   (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
  125. # endif
  126.  
  127. #ifdef CONFIG_PROFILE_ALL_BRANCHES
  128. /*
  129.  * "Define 'is'", Bill Clinton
  130.  * "Define 'if'", Steven Rostedt
  131.  */
  132. #define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
  133. #define __trace_if(cond) \
  134.         if (__builtin_constant_p((cond)) ? !!(cond) :                   \
  135.         ({                                                              \
  136.                 int ______r;                                            \
  137.                 static struct ftrace_branch_data                        \
  138.                         __attribute__((__aligned__(4)))                 \
  139.                         __attribute__((section("_ftrace_branch")))      \
  140.                         ______f = {                                     \
  141.                                 .func = __func__,                       \
  142.                                 .file = __FILE__,                       \
  143.                                 .line = __LINE__,                       \
  144.                         };                                              \
  145.                 ______r = !!(cond);                                     \
  146.                 ______f.miss_hit[______r]++;                                    \
  147.                 ______r;                                                \
  148.         }))
  149. #endif /* CONFIG_PROFILE_ALL_BRANCHES */
  150.  
  151. #else
  152. # define likely(x)      __builtin_expect(!!(x), 1)
  153. # define unlikely(x)    __builtin_expect(!!(x), 0)
  154. #endif
  155.  
  156. /* Optimization barrier */
  157. #ifndef barrier
  158. # define barrier() __memory_barrier()
  159. #endif
  160.  
  161. /* Unreachable code */
  162. #ifndef unreachable
  163. # define unreachable() do { } while (1)
  164. #endif
  165.  
  166. #ifndef RELOC_HIDE
  167. # define RELOC_HIDE(ptr, off)                                   \
  168.   ({ unsigned long __ptr;                                       \
  169.      __ptr = (unsigned long) (ptr);                             \
  170.     (typeof(ptr)) (__ptr + (off)); })
  171. #endif
  172.  
  173. #endif /* __KERNEL__ */
  174.  
  175. #endif /* __ASSEMBLY__ */
  176.  
  177. #ifdef __KERNEL__
  178. /*
  179.  * Allow us to mark functions as 'deprecated' and have gcc emit a nice
  180.  * warning for each use, in hopes of speeding the functions removal.
  181.  * Usage is:
  182.  *              int __deprecated foo(void)
  183.  */
  184. #ifndef __deprecated
  185. # define __deprecated           /* unimplemented */
  186. #endif
  187.  
  188. #ifdef MODULE
  189. #define __deprecated_for_modules __deprecated
  190. #else
  191. #define __deprecated_for_modules
  192. #endif
  193.  
  194. #ifndef __must_check
  195. #define __must_check
  196. #endif
  197.  
  198. #ifndef CONFIG_ENABLE_MUST_CHECK
  199. #undef __must_check
  200. #define __must_check
  201. #endif
  202. #ifndef CONFIG_ENABLE_WARN_DEPRECATED
  203. #undef __deprecated
  204. #undef __deprecated_for_modules
  205. #define __deprecated
  206. #define __deprecated_for_modules
  207. #endif
  208.  
  209. /*
  210.  * Allow us to avoid 'defined but not used' warnings on functions and data,
  211.  * as well as force them to be emitted to the assembly file.
  212.  *
  213.  * As of gcc 3.4, static functions that are not marked with attribute((used))
  214.  * may be elided from the assembly file.  As of gcc 3.4, static data not so
  215.  * marked will not be elided, but this may change in a future gcc version.
  216.  *
  217.  * NOTE: Because distributions shipped with a backported unit-at-a-time
  218.  * compiler in gcc 3.3, we must define __used to be __attribute__((used))
  219.  * for gcc >=3.3 instead of 3.4.
  220.  *
  221.  * In prior versions of gcc, such functions and data would be emitted, but
  222.  * would be warned about except with attribute((unused)).
  223.  *
  224.  * Mark functions that are referenced only in inline assembly as __used so
  225.  * the code is emitted even though it appears to be unreferenced.
  226.  */
  227. #ifndef __used
  228. # define __used                 /* unimplemented */
  229. #endif
  230.  
  231. #ifndef __maybe_unused
  232. # define __maybe_unused         /* unimplemented */
  233. #endif
  234.  
  235. #ifndef __always_unused
  236. # define __always_unused        /* unimplemented */
  237. #endif
  238.  
  239. #ifndef noinline
  240. #define noinline
  241. #endif
  242.  
  243. /*
  244.  * Rather then using noinline to prevent stack consumption, use
  245.  * noinline_for_stack instead.  For documentation reasons.
  246.  */
  247. #define noinline_for_stack noinline
  248.  
  249. #ifndef __always_inline
  250. #define __always_inline inline
  251. #endif
  252.  
  253. #endif /* __KERNEL__ */
  254.  
  255. /*
  256.  * From the GCC manual:
  257.  *
  258.  * Many functions do not examine any values except their arguments,
  259.  * and have no effects except the return value.  Basically this is
  260.  * just slightly more strict class than the `pure' attribute above,
  261.  * since function is not allowed to read global memory.
  262.  *
  263.  * Note that a function that has pointer arguments and examines the
  264.  * data pointed to must _not_ be declared `const'.  Likewise, a
  265.  * function that calls a non-`const' function usually must not be
  266.  * `const'.  It does not make sense for a `const' function to return
  267.  * `void'.
  268.  */
  269. #ifndef __attribute_const__
  270. # define __attribute_const__    /* unimplemented */
  271. #endif
  272.  
  273. /*
  274.  * Tell gcc if a function is cold. The compiler will assume any path
  275.  * directly leading to the call is unlikely.
  276.  */
  277.  
  278. #ifndef __cold
  279. #define __cold
  280. #endif
  281.  
  282. /* Simple shorthand for a section definition */
  283. #ifndef __section
  284. # define __section(S) __attribute__ ((__section__(#S)))
  285. #endif
  286.  
  287. #ifndef __visible
  288. #define __visible
  289. #endif
  290.  
  291. /* Are two types/vars the same type (ignoring qualifiers)? */
  292. #ifndef __same_type
  293. # define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
  294. #endif
  295.  
  296. /* Compile time object size, -1 for unknown */
  297. #ifndef __compiletime_object_size
  298. # define __compiletime_object_size(obj) -1
  299. #endif
  300. #ifndef __compiletime_warning
  301. # define __compiletime_warning(message)
  302. #endif
  303. #ifndef __compiletime_error
  304. # define __compiletime_error(message)
  305. #endif
  306. #ifndef __linktime_error
  307. # define __linktime_error(message)
  308. #endif
  309. /*
  310.  * Prevent the compiler from merging or refetching accesses.  The compiler
  311.  * is also forbidden from reordering successive instances of ACCESS_ONCE(),
  312.  * but only when the compiler is aware of some particular ordering.  One way
  313.  * to make the compiler aware of ordering is to put the two invocations of
  314.  * ACCESS_ONCE() in different C statements.
  315.  *
  316.  * This macro does absolutely -nothing- to prevent the CPU from reordering,
  317.  * merging, or refetching absolutely anything at any time.  Its main intended
  318.  * use is to mediate communication between process-level code and irq/NMI
  319.  * handlers, all running on the same CPU.
  320.  */
  321. #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
  322.  
  323. #endif /* __LINUX_COMPILER_H */
  324.