#ifndef __LINUX_COMPILER_H#error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead."#endif /* * Common definitions for all gcc versions go here. */  /* Optimization barrier *//* The "volatile" is due to gcc bugs */#define barrier() __asm__ __volatile__("": : :"memory") /* * This macro obfuscates arithmetic on a variable address so that gcc * shouldn't recognize the original var, and make assumptions about it. * * This is needed because the C standard makes it undefined to do * pointer arithmetic on "objects" outside their boundaries and the * gcc optimizers assume this is the case. In particular they * assume such arithmetic does not wrap. * * A miscompilation has been observed because of this on PPC. * To work around it we hide the relationship of the pointer and the object * using this macro. * * Versions of the ppc64 compiler before 4.1 had a bug where use of * RELOC_HIDE could trash r30. The bug can be worked around by changing * the inline assembly constraint from =g to =r, in this particular * case either is valid. */#define RELOC_HIDE(ptr, off)					\  ({ unsigned long __ptr;					\    __asm__ ("" : "=r"(__ptr) : "0"(ptr));		\    (typeof(ptr)) (__ptr + (off)); }) #ifdef __CHECKER__#define __must_be_array(arr) 0#else/* &a[0] degrades to a pointer: a different type from an array */#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))#endif /* * Force always-inline if the user requests it so via the .config, * or if gcc is too old: */#if !defined(CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING) || \    !defined(CONFIG_OPTIMIZE_INLINING) || (__GNUC__ < 4)# define inline		inline		__attribute__((always_inline))# define __inline__	__inline__	__attribute__((always_inline))# define __inline	__inline	__attribute__((always_inline))#endif #define __deprecated			__attribute__((deprecated))#define __packed			__attribute__((packed))#define __weak				__attribute__((weak)) /* * it doesn't make sense on ARM (currently the only user of __naked) to trace * naked functions because then mcount is called without stack and frame pointer * being set up and there is no chance to restore the lr register to the value * before mcount was called. * * The asm() bodies of naked functions often depend on standard calling conventions, * therefore they must be noinline and noclone.  GCC 4.[56] currently fail to enforce * this, so we must do so ourselves.  See GCC PR44290. */#define __naked				__attribute__((naked)) noinline __noclone notrace #define __noreturn			__attribute__((noreturn)) /* * From the GCC manual: * * Many functions have no effects except the return value and their * return value depends only on the parameters and/or global * variables.  Such a function can be subject to common subexpression * elimination and loop optimization just as an arithmetic operator * would be. * [...] */#define __pure				__attribute__((pure))#define __aligned(x)			__attribute__((aligned(x)))#define __printf(a,b)			__attribute__((format(printf,a,b)))#define  noinline			__attribute__((noinline))#define __attribute_const__		__attribute__((__const__))#define __maybe_unused			__attribute__((unused))#define __always_unused			__attribute__((unused)) #define __gcc_header(x) #x#define _gcc_header(x) __gcc_header(linux/compiler-gcc##x.h)#define gcc_header(x) _gcc_header(x)#include gcc_header(__GNUC__) #if !defined(__noclone)#define __noclone	/* not needed */#endif /* * A trick to suppress uninitialized variable warning without generating any * code */#define uninitialized_var(x) x = x #define __always_inline		inline __attribute__((always_inline))