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  1. #ifndef __LINUX_COMPILER_H
  2. #error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead."
  3. #endif
  4.  
  5. /*
  6.  * Common definitions for all gcc versions go here.
  7.  */
  8. #define GCC_VERSION (__GNUC__ * 10000 \
  9.                    + __GNUC_MINOR__ * 100 \
  10.                    + __GNUC_PATCHLEVEL__)
  11.  
  12.  
  13. /* Optimization barrier */
  14. /* The "volatile" is due to gcc bugs */
  15. #define barrier() __asm__ __volatile__("": : :"memory")
  16.  
  17. /*
  18.  * This macro obfuscates arithmetic on a variable address so that gcc
  19.  * shouldn't recognize the original var, and make assumptions about it.
  20.  *
  21.  * This is needed because the C standard makes it undefined to do
  22.  * pointer arithmetic on "objects" outside their boundaries and the
  23.  * gcc optimizers assume this is the case. In particular they
  24.  * assume such arithmetic does not wrap.
  25.  *
  26.  * A miscompilation has been observed because of this on PPC.
  27.  * To work around it we hide the relationship of the pointer and the object
  28.  * using this macro.
  29.  *
  30.  * Versions of the ppc64 compiler before 4.1 had a bug where use of
  31.  * RELOC_HIDE could trash r30. The bug can be worked around by changing
  32.  * the inline assembly constraint from =g to =r, in this particular
  33.  * case either is valid.
  34.  */
  35. #define RELOC_HIDE(ptr, off)                                    \
  36.   ({ unsigned long __ptr;                                       \
  37.     __asm__ ("" : "=r"(__ptr) : "0"(ptr));              \
  38.     (typeof(ptr)) (__ptr + (off)); })
  39.  
  40. #ifdef __CHECKER__
  41. #define __must_be_array(arr) 0
  42. #else
  43. /* &a[0] degrades to a pointer: a different type from an array */
  44. #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
  45. #endif
  46.  
  47. /*
  48.  * Force always-inline if the user requests it so via the .config,
  49.  * or if gcc is too old:
  50.  */
  51. #if !defined(CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING) || \
  52.     !defined(CONFIG_OPTIMIZE_INLINING) || (__GNUC__ < 4)
  53. # define inline         inline          __attribute__((always_inline))
  54. # define __inline__     __inline__      __attribute__((always_inline))
  55. # define __inline       __inline        __attribute__((always_inline))
  56. #endif
  57.  
  58. #define __deprecated                    __attribute__((deprecated))
  59. #define __packed                        __attribute__((packed))
  60. #define __weak                          __attribute__((weak))
  61.  
  62. /*
  63.  * it doesn't make sense on ARM (currently the only user of __naked) to trace
  64.  * naked functions because then mcount is called without stack and frame pointer
  65.  * being set up and there is no chance to restore the lr register to the value
  66.  * before mcount was called.
  67.  *
  68.  * The asm() bodies of naked functions often depend on standard calling conventions,
  69.  * therefore they must be noinline and noclone.  GCC 4.[56] currently fail to enforce
  70.  * this, so we must do so ourselves.  See GCC PR44290.
  71.  */
  72. #define __naked                         __attribute__((naked)) noinline __noclone notrace
  73.  
  74. #define __noreturn                      __attribute__((noreturn))
  75.  
  76. /*
  77.  * From the GCC manual:
  78.  *
  79.  * Many functions have no effects except the return value and their
  80.  * return value depends only on the parameters and/or global
  81.  * variables.  Such a function can be subject to common subexpression
  82.  * elimination and loop optimization just as an arithmetic operator
  83.  * would be.
  84.  * [...]
  85.  */
  86. #define __pure                          __attribute__((pure))
  87. #define __aligned(x)                    __attribute__((aligned(x)))
  88. #define __printf(a, b)                  __attribute__((format(printf, a, b)))
  89. #define __scanf(a, b)                   __attribute__((format(scanf, a, b)))
  90. #define  noinline                       __attribute__((noinline))
  91. #define __attribute_const__             __attribute__((__const__))
  92. #define __maybe_unused                  __attribute__((unused))
  93. #define __always_unused                 __attribute__((unused))
  94.  
  95. #define __gcc_header(x) #x
  96. #define _gcc_header(x) __gcc_header(linux/compiler-gcc##x.h)
  97. #define gcc_header(x) _gcc_header(x)
  98. #include gcc_header(__GNUC__)
  99.  
  100. #if !defined(__noclone)
  101. #define __noclone       /* not needed */
  102. #endif
  103.  
  104. /*
  105.  * A trick to suppress uninitialized variable warning without generating any
  106.  * code
  107.  */
  108. #define uninitialized_var(x) x = x
  109.  
  110. #define __always_inline         inline __attribute__((always_inline))
  111.