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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. /* Make the optimizer believe the variable can be manipulated arbitrarily. */
  41. #define OPTIMIZER_HIDE_VAR(var) __asm__ ("" : "=r" (var) : "0" (var))
  42.  
  43. #ifdef __CHECKER__
  44. #define __must_be_array(arr) 0
  45. #else
  46. /* &a[0] degrades to a pointer: a different type from an array */
  47. #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
  48. #endif
  49.  
  50. /*
  51.  * Force always-inline if the user requests it so via the .config,
  52.  * or if gcc is too old:
  53.  */
  54. #if !defined(CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING) || \
  55.     !defined(CONFIG_OPTIMIZE_INLINING) || (__GNUC__ < 4)
  56. # define inline         inline          __attribute__((always_inline)) notrace
  57. # define __inline__     __inline__      __attribute__((always_inline)) notrace
  58. # define __inline       __inline        __attribute__((always_inline)) notrace
  59. #else
  60. /* A lot of inline functions can cause havoc with function tracing */
  61. # define inline         inline          notrace
  62. # define __inline__     __inline__      notrace
  63. # define __inline       __inline        notrace
  64. #endif
  65.  
  66. #define __deprecated                    __attribute__((deprecated))
  67. #define __packed                        __attribute__((packed))
  68. #define __weak                          __attribute__((weak))
  69.  
  70. /*
  71.  * it doesn't make sense on ARM (currently the only user of __naked) to trace
  72.  * naked functions because then mcount is called without stack and frame pointer
  73.  * being set up and there is no chance to restore the lr register to the value
  74.  * before mcount was called.
  75.  *
  76.  * The asm() bodies of naked functions often depend on standard calling conventions,
  77.  * therefore they must be noinline and noclone.  GCC 4.[56] currently fail to enforce
  78.  * this, so we must do so ourselves.  See GCC PR44290.
  79.  */
  80. #define __naked                         __attribute__((naked)) noinline __noclone notrace
  81.  
  82. #define __noreturn                      __attribute__((noreturn))
  83.  
  84. /*
  85.  * From the GCC manual:
  86.  *
  87.  * Many functions have no effects except the return value and their
  88.  * return value depends only on the parameters and/or global
  89.  * variables.  Such a function can be subject to common subexpression
  90.  * elimination and loop optimization just as an arithmetic operator
  91.  * would be.
  92.  * [...]
  93.  */
  94. #define __pure                          __attribute__((pure))
  95. #define __aligned(x)                    __attribute__((aligned(x)))
  96. #define __printf(a, b)                  __attribute__((format(printf, a, b)))
  97. #define __scanf(a, b)                   __attribute__((format(scanf, a, b)))
  98. #define  noinline                       __attribute__((noinline))
  99. #define __attribute_const__             __attribute__((__const__))
  100. #define __maybe_unused                  __attribute__((unused))
  101. #define __always_unused                 __attribute__((unused))
  102.  
  103. #define __gcc_header(x) #x
  104. #define _gcc_header(x) __gcc_header(linux/compiler-gcc##x.h)
  105. #define gcc_header(x) _gcc_header(x)
  106. #include gcc_header(__GNUC__)
  107.  
  108. #if !defined(__noclone)
  109. #define __noclone       /* not needed */
  110. #endif
  111.  
  112. /*
  113.  * A trick to suppress uninitialized variable warning without generating any
  114.  * code
  115.  */
  116. #define uninitialized_var(x) x = x
  117.  
  118. #define __always_inline         inline __attribute__((always_inline))
  119.