WebSVN – Kolibri OS – Diff – /drivers/include/linux/compiler.h


#ifndef __LINUX_COMPILER_H
#define __LINUX_COMPILER_H
 
#ifndef __ASSEMBLY__
 
#ifdef __CHECKER__
# define __user		__attribute__((noderef, address_space(1)))
# define __kernel	__attribute__((address_space(0)))
# define __safe		__attribute__((safe))
# define __force	__attribute__((force))
# define __nocast	__attribute__((nocast))
# define __iomem	__attribute__((noderef, address_space(2)))
# define __must_hold(x)	__attribute__((context(x,1,1)))
# define __acquires(x)	__attribute__((context(x,0,1)))
# define __releases(x)	__attribute__((context(x,1,0)))
# define __acquire(x)	__context__(x,1)
# define __release(x)	__context__(x,-1)
# define __cond_lock(x,c)	((c) ? ({ __acquire(x); 1; }) : 0)
# define __percpu	__attribute__((noderef, address_space(3)))
#ifdef CONFIG_SPARSE_RCU_POINTER
# define __rcu		__attribute__((noderef, address_space(4)))
#else
# define __rcu
#endif
extern void __chk_user_ptr(const volatile void __user *);
extern void __chk_io_ptr(const volatile void __iomem *);
#else
# define __user
# define __kernel
# define __safe
# define __force
# define __nocast
# define __iomem
# define __chk_user_ptr(x) (void)0
# define __chk_io_ptr(x) (void)0
# define __builtin_warning(x, y...) (1)
# define __must_hold(x)
# define __acquires(x)
# define __releases(x)
# define __acquire(x) (void)0
# define __release(x) (void)0
# define __cond_lock(x,c) (c)
# define __percpu
# define __rcu
#endif
 
/* Indirect macros required for expanded argument pasting, eg. __LINE__. */
#define ___PASTE(a,b) a##b
#define __PASTE(a,b) ___PASTE(a,b)
 
#ifdef __KERNEL__
 
#ifdef __GNUC__
#include 
#endif
 
#define notrace __attribute__((no_instrument_function))
 
/* Intel compiler defines __GNUC__. So we will overwrite implementations
 * coming from above header files here
 */
#ifdef __INTEL_COMPILER
# include 
#endif
 
/* Clang compiler defines __GNUC__. So we will overwrite implementations
 * coming from above header files here
 */
#ifdef __clang__
#include 
#endif
 
/*
 * Generic compiler-dependent macros required for kernel
 * build go below this comment. Actual compiler/compiler version
 * specific implementations come from the above header files
 */
 
struct ftrace_branch_data {
	const char *func;
	const char *file;
	unsigned line;
	union {
		struct {
			unsigned long correct;
			unsigned long incorrect;
		};
		struct {
			unsigned long miss;
			unsigned long hit;
		};
		unsigned long miss_hit[2];
	};
};
 
/*
 * Note: DISABLE_BRANCH_PROFILING can be used by special lowlevel code
 * to disable branch tracing on a per file basis.
 */
#if defined(CONFIG_TRACE_BRANCH_PROFILING) \
    && !defined(DISABLE_BRANCH_PROFILING) && !defined(__CHECKER__)
void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
 
#define likely_notrace(x)	__builtin_expect(!!(x), 1)
#define unlikely_notrace(x)	__builtin_expect(!!(x), 0)
 
#define __branch_check__(x, expect) ({					\
			int ______r;					\
			static struct ftrace_branch_data		\
				__attribute__((__aligned__(4)))		\
				__attribute__((section("_ftrace_annotated_branch"))) \
				______f = {				\
				.func = __func__,			\
				.file = __FILE__,			\
				.line = __LINE__,			\
			};						\
			______r = likely_notrace(x);			\
			ftrace_likely_update(&______f, ______r, expect); \
			______r;					\
		})
 
/*
 * Using __builtin_constant_p(x) to ignore cases where the return
 * value is always the same.  This idea is taken from a similar patch
 * written by Daniel Walker.
 */
# ifndef likely
#  define likely(x)	(__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 1))
# endif
# ifndef unlikely
#  define unlikely(x)	(__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
# endif
 
#ifdef CONFIG_PROFILE_ALL_BRANCHES
/*
 * "Define 'is'", Bill Clinton
 * "Define 'if'", Steven Rostedt
 */
#define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
#define __trace_if(cond) \
	if (__builtin_constant_p((cond)) ? !!(cond) :			\
	({								\
		int ______r;						\
		static struct ftrace_branch_data			\
			__attribute__((__aligned__(4)))			\
			__attribute__((section("_ftrace_branch")))	\
			______f = {					\
				.func = __func__,			\
				.file = __FILE__,			\
				.line = __LINE__,			\
			};						\
		______r = !!(cond);					\
		______f.miss_hit[______r]++;					\
		______r;						\
	}))
#endif /* CONFIG_PROFILE_ALL_BRANCHES */
 
#else
# define likely(x)	__builtin_expect(!!(x), 1)
# define unlikely(x)	__builtin_expect(!!(x), 0)
#endif
 
/* Optimization barrier */
#ifndef barrier
# define barrier() __memory_barrier()
#endif
 
/* Unreachable code */
#ifndef unreachable
# define unreachable() do { } while (1)
#endif
 
#ifndef RELOC_HIDE
# define RELOC_HIDE(ptr, off)					\
  ({ unsigned long __ptr;					\
     __ptr = (unsigned long) (ptr);				\
    (typeof(ptr)) (__ptr + (off)); })
#endif
 
#ifndef OPTIMIZER_HIDE_VAR
#define OPTIMIZER_HIDE_VAR(var) barrier()
#endif
 
/* Not-quite-unique ID. */
#ifndef __UNIQUE_ID
# define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __LINE__)
#endif
 
#include 
 
static __always_inline void data_access_exceeds_word_size(void)
#ifdef __compiletime_warning
__compiletime_warning("data access exceeds word size and won't be atomic")
#endif
;
 
static __always_inline void data_access_exceeds_word_size(void)
{
}
 
static __always_inline void __read_once_size(volatile void *p, void *res, int size)
{
	switch (size) {
	case 1: *(__u8 *)res = *(volatile __u8 *)p; break;
	case 2: *(__u16 *)res = *(volatile __u16 *)p; break;
	case 4: *(__u32 *)res = *(volatile __u32 *)p; break;
#ifdef CONFIG_64BIT
	case 8: *(__u64 *)res = *(volatile __u64 *)p; break;
#endif
	default:
		barrier();
		__builtin_memcpy((void *)res, (const void *)p, size);
		data_access_exceeds_word_size();
		barrier();
	}
}
 
static __always_inline void __assign_once_size(volatile void *p, void *res, int size)
{
	switch (size) {
	case 1: *(volatile __u8 *)p = *(__u8 *)res; break;
	case 2: *(volatile __u16 *)p = *(__u16 *)res; break;
	case 4: *(volatile __u32 *)p = *(__u32 *)res; break;
#ifdef CONFIG_64BIT
	case 8: *(volatile __u64 *)p = *(__u64 *)res; break;
#endif
	default:
		barrier();
		__builtin_memcpy((void *)p, (const void *)res, size);
		data_access_exceeds_word_size();
		barrier();
	}
}
 
/*
 * Prevent the compiler from merging or refetching reads or writes. The
 * compiler is also forbidden from reordering successive instances of
 * READ_ONCE, ASSIGN_ONCE and ACCESS_ONCE (see below), but only when the
 * compiler is aware of some particular ordering.  One way to make the
 * compiler aware of ordering is to put the two invocations of READ_ONCE,
 * ASSIGN_ONCE or ACCESS_ONCE() in different C statements.
 *
 * In contrast to ACCESS_ONCE these two macros will also work on aggregate
 * data types like structs or unions. If the size of the accessed data
 * type exceeds the word size of the machine (e.g., 32 bits or 64 bits)
 * READ_ONCE() and ASSIGN_ONCE()  will fall back to memcpy and print a
 * compile-time warning.
 *
 * Their two major use cases are: (1) Mediating communication between
 * process-level code and irq/NMI handlers, all running on the same CPU,
 * and (2) Ensuring that the compiler does not  fold, spindle, or otherwise
 * mutilate accesses that either do not require ordering or that interact
 * with an explicit memory barrier or atomic instruction that provides the
 * required ordering.
 */
 
#define READ_ONCE(x) \
	({ typeof(x) __val; __read_once_size(&x, &__val, sizeof(__val)); __val; })
 
#define ASSIGN_ONCE(val, x) \
	({ typeof(x) __val; __val = val; __assign_once_size(&x, &__val, sizeof(__val)); __val; })
 
#endif /* __KERNEL__ */
 
#endif /* __ASSEMBLY__ */
 
#ifdef __KERNEL__
/*
 * Allow us to mark functions as 'deprecated' and have gcc emit a nice
 * warning for each use, in hopes of speeding the functions removal.
 * Usage is:
 * 		int __deprecated foo(void)
 */
#ifndef __deprecated
# define __deprecated		/* unimplemented */
#endif
 
#ifdef MODULE
#define __deprecated_for_modules __deprecated
#else
#define __deprecated_for_modules
#endif
 
#ifndef __must_check
#define __must_check
#endif
 
#ifndef CONFIG_ENABLE_MUST_CHECK
#undef __must_check
#define __must_check
#endif
#ifndef CONFIG_ENABLE_WARN_DEPRECATED
#undef __deprecated
#undef __deprecated_for_modules
#define __deprecated
#define __deprecated_for_modules
#endif
 
/*
 * Allow us to avoid 'defined but not used' warnings on functions and data,
 * as well as force them to be emitted to the assembly file.
 *
 * As of gcc 3.4, static functions that are not marked with attribute((used))
 * may be elided from the assembly file.  As of gcc 3.4, static data not so
 * marked will not be elided, but this may change in a future gcc version.
 *
 * NOTE: Because distributions shipped with a backported unit-at-a-time
 * compiler in gcc 3.3, we must define __used to be __attribute__((used))
 * for gcc >=3.3 instead of 3.4.
 *
 * In prior versions of gcc, such functions and data would be emitted, but
 * would be warned about except with attribute((unused)).
 *
 * Mark functions that are referenced only in inline assembly as __used so
 * the code is emitted even though it appears to be unreferenced.
 */
#ifndef __used
# define __used			/* unimplemented */
#endif
 
#ifndef __maybe_unused
# define __maybe_unused		/* unimplemented */
#endif
 
#ifndef __always_unused
# define __always_unused	/* unimplemented */
#endif
 
#ifndef noinline
#define noinline
#endif
 
/*
 * Rather then using noinline to prevent stack consumption, use
 * noinline_for_stack instead.  For documentation reasons.
 */
#define noinline_for_stack noinline
 
#ifndef __always_inline
#define __always_inline inline
#endif
 
#endif /* __KERNEL__ */
 
/*
 * From the GCC manual:
 *
 * Many functions do not examine any values except their arguments,
 * and have no effects except the return value.  Basically this is
 * just slightly more strict class than the `pure' attribute above,
 * since function is not allowed to read global memory.
 *
 * Note that a function that has pointer arguments and examines the
 * data pointed to must _not_ be declared `const'.  Likewise, a
 * function that calls a non-`const' function usually must not be
 * `const'.  It does not make sense for a `const' function to return
 * `void'.
 */
#ifndef __attribute_const__
# define __attribute_const__	/* unimplemented */
#endif
 
/*
 * Tell gcc if a function is cold. The compiler will assume any path
 * directly leading to the call is unlikely.
 */
 
#ifndef __cold
#define __cold
#endif
 
/* Simple shorthand for a section definition */
#ifndef __section
# define __section(S) __attribute__ ((__section__(#S)))
#endif
 
#ifndef __visible
#define __visible
#endif
 
/* Are two types/vars the same type (ignoring qualifiers)? */
#ifndef __same_type
# define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
#endif
 
/* Is this type a native word size -- useful for atomic operations */
#ifndef __native_word
# define __native_word(t) (sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))
#endif
 
/* Compile time object size, -1 for unknown */
#ifndef __compiletime_object_size
# define __compiletime_object_size(obj) -1
#endif
#ifndef __compiletime_warning
# define __compiletime_warning(message)
#endif
#ifndef __compiletime_error
# define __compiletime_error(message)
/*
 * Sparse complains of variable sized arrays due to the temporary variable in
 * __compiletime_assert. Unfortunately we can't just expand it out to make
 * sparse see a constant array size without breaking compiletime_assert on old
 * versions of GCC (e.g. 4.2.4), so hide the array from sparse altogether.
 */
# ifndef __CHECKER__
# define __compiletime_error_fallback(condition) \
	do { ((void)sizeof(char[1 - 2 * condition])); } while (0)
# endif
#endif
#ifndef __compiletime_error_fallback
# define __compiletime_error_fallback(condition) do { } while (0)
#endif
 
#define __compiletime_assert(condition, msg, prefix, suffix)		\
	do {								\
		bool __cond = !(condition);				\
		extern void prefix ## suffix(void) __compiletime_error(msg); \
		if (__cond)						\
			prefix ## suffix();				\
		__compiletime_error_fallback(__cond);			\
	} while (0)
 
#define _compiletime_assert(condition, msg, prefix, suffix) \
	__compiletime_assert(condition, msg, prefix, suffix)
 
/**
 * compiletime_assert - break build and emit msg if condition is false
 * @condition: a compile-time constant condition to check
 * @msg:       a message to emit if condition is false
 *
 * In tradition of POSIX assert, this macro will break the build if the
 * supplied condition is *false*, emitting the supplied error message if the
 * compiler has support to do so.
 */
#define compiletime_assert(condition, msg) \
	_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
 
#define compiletime_assert_atomic_type(t)				\
	compiletime_assert(__native_word(t),				\
		"Need native word sized stores/loads for atomicity.")
 
/*
 * Prevent the compiler from merging or refetching accesses.  The compiler
 * is also forbidden from reordering successive instances of ACCESS_ONCE(),
 * but only when the compiler is aware of some particular ordering.  One way
 * to make the compiler aware of ordering is to put the two invocations of
 * ACCESS_ONCE() in different C statements.
 *
 * This macro does absolutely -nothing- to prevent the CPU from reordering,
 * merging, or refetching absolutely anything at any time.  Its main intended
 * use is to mediate communication between process-level code and irq/NMI
 * handlers, all running on the same CPU.
 */
#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
 
/* Ignore/forbid kprobes attach on very low level functions marked by this attribute: */
#ifdef CONFIG_KPROBES
# define __kprobes	__attribute__((__section__(".kprobes.text")))
# define nokprobe_inline	__always_inline
#else
# define __kprobes
# define nokprobe_inline	inline
#endif
#endif /* __LINUX_COMPILER_H */

Rev 5056	Rev 5270
1	#ifndef __LINUX_COMPILER_H	1	#ifndef __LINUX_COMPILER_H
2	#define __LINUX_COMPILER_H	2	#define __LINUX_COMPILER_H
3		3
4	#ifndef __ASSEMBLY__	4	#ifndef __ASSEMBLY__
5		5
6	#ifdef __CHECKER__	6	#ifdef __CHECKER__
7	# define __user __attribute__((noderef, address_space(1)))	7	# define __user __attribute__((noderef, address_space(1)))
8	# define __kernel __attribute__((address_space(0)))	8	# define __kernel __attribute__((address_space(0)))
9	# define __safe __attribute__((safe))	9	# define __safe __attribute__((safe))
10	# define __force __attribute__((force))	10	# define __force __attribute__((force))
11	# define __nocast __attribute__((nocast))	11	# define __nocast __attribute__((nocast))
12	# define __iomem __attribute__((noderef, address_space(2)))	12	# define __iomem __attribute__((noderef, address_space(2)))
13	# define __must_hold(x) __attribute__((context(x,1,1)))	13	# define __must_hold(x) __attribute__((context(x,1,1)))
14	# define __acquires(x) __attribute__((context(x,0,1)))	14	# define __acquires(x) __attribute__((context(x,0,1)))
15	# define __releases(x) __attribute__((context(x,1,0)))	15	# define __releases(x) __attribute__((context(x,1,0)))
16	# define __acquire(x) __context__(x,1)	16	# define __acquire(x) __context__(x,1)
17	# define __release(x) __context__(x,-1)	17	# define __release(x) __context__(x,-1)
18	# define __cond_lock(x,c) ((c) ? ({ __acquire(x); 1; }) : 0)	18	# define __cond_lock(x,c) ((c) ? ({ __acquire(x); 1; }) : 0)
19	# define __percpu __attribute__((noderef, address_space(3)))	19	# define __percpu __attribute__((noderef, address_space(3)))
20	#ifdef CONFIG_SPARSE_RCU_POINTER	20	#ifdef CONFIG_SPARSE_RCU_POINTER
21	# define __rcu __attribute__((noderef, address_space(4)))	21	# define __rcu __attribute__((noderef, address_space(4)))
22	#else	22	#else
23	# define __rcu	23	# define __rcu
24	#endif	24	#endif
25	extern void __chk_user_ptr(const volatile void __user *);	25	extern void __chk_user_ptr(const volatile void __user *);
26	extern void __chk_io_ptr(const volatile void __iomem *);	26	extern void __chk_io_ptr(const volatile void __iomem *);
27	#else	27	#else
28	# define __user	28	# define __user
29	# define __kernel	29	# define __kernel
30	# define __safe	30	# define __safe
31	# define __force	31	# define __force
32	# define __nocast	32	# define __nocast
33	# define __iomem	33	# define __iomem
34	# define __chk_user_ptr(x) (void)0	34	# define __chk_user_ptr(x) (void)0
35	# define __chk_io_ptr(x) (void)0	35	# define __chk_io_ptr(x) (void)0
36	# define __builtin_warning(x, y...) (1)	36	# define __builtin_warning(x, y...) (1)
37	# define __must_hold(x)	37	# define __must_hold(x)
38	# define __acquires(x)	38	# define __acquires(x)
39	# define __releases(x)	39	# define __releases(x)
40	# define __acquire(x) (void)0	40	# define __acquire(x) (void)0
41	# define __release(x) (void)0	41	# define __release(x) (void)0
42	# define __cond_lock(x,c) (c)	42	# define __cond_lock(x,c) (c)
43	# define __percpu	43	# define __percpu
44	# define __rcu	44	# define __rcu
45	#endif	45	#endif
46		46
47	/* Indirect macros required for expanded argument pasting, eg. __LINE__. */	47	/* Indirect macros required for expanded argument pasting, eg. __LINE__. */
48	#define ___PASTE(a,b) a##b	48	#define ___PASTE(a,b) a##b
49	#define __PASTE(a,b) ___PASTE(a,b)	49	#define __PASTE(a,b) ___PASTE(a,b)
50		50
51	#ifdef __KERNEL__	51	#ifdef __KERNEL__
52		52
53	#ifdef __GNUC__	53	#ifdef __GNUC__
54	#include	54	#include
55	#endif	55	#endif
56		56
57	#define notrace __attribute__((no_instrument_function))	57	#define notrace __attribute__((no_instrument_function))
58		58
59	/* Intel compiler defines __GNUC__. So we will overwrite implementations	59	/* Intel compiler defines __GNUC__. So we will overwrite implementations
60	* coming from above header files here	60	* coming from above header files here
61	*/	61	*/
62	#ifdef __INTEL_COMPILER	62	#ifdef __INTEL_COMPILER
63	# include	63	# include
64	#endif	64	#endif
65		65
66	/* Clang compiler defines __GNUC__. So we will overwrite implementations	66	/* Clang compiler defines __GNUC__. So we will overwrite implementations
67	* coming from above header files here	67	* coming from above header files here
68	*/	68	*/
69	#ifdef __clang__	69	#ifdef __clang__
70	#include	70	#include
71	#endif	71	#endif
72		72
73	/*	73	/*
74	* Generic compiler-dependent macros required for kernel	74	* Generic compiler-dependent macros required for kernel
75	* build go below this comment. Actual compiler/compiler version	75	* build go below this comment. Actual compiler/compiler version
76	* specific implementations come from the above header files	76	* specific implementations come from the above header files
77	*/	77	*/
78		78
79	struct ftrace_branch_data {	79	struct ftrace_branch_data {
80	const char *func;	80	const char *func;
81	const char *file;	81	const char *file;
82	unsigned line;	82	unsigned line;
83	union {	83	union {
84	struct {	84	struct {
85	unsigned long correct;	85	unsigned long correct;
86	unsigned long incorrect;	86	unsigned long incorrect;
87	};	87	};
88	struct {	88	struct {
89	unsigned long miss;	89	unsigned long miss;
90	unsigned long hit;	90	unsigned long hit;
91	};	91	};
92	unsigned long miss_hit[2];	92	unsigned long miss_hit[2];
93	};	93	};
94	};	94	};
95		95
96	/*	96	/*
97	* Note: DISABLE_BRANCH_PROFILING can be used by special lowlevel code	97	* Note: DISABLE_BRANCH_PROFILING can be used by special lowlevel code
98	* to disable branch tracing on a per file basis.	98	* to disable branch tracing on a per file basis.
99	*/	99	*/
100	#if defined(CONFIG_TRACE_BRANCH_PROFILING) \	100	#if defined(CONFIG_TRACE_BRANCH_PROFILING) \
101	&& !defined(DISABLE_BRANCH_PROFILING) && !defined(__CHECKER__)	101	&& !defined(DISABLE_BRANCH_PROFILING) && !defined(__CHECKER__)
102	void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);	102	void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
103		103
104	#define likely_notrace(x) __builtin_expect(!!(x), 1)	104	#define likely_notrace(x) __builtin_expect(!!(x), 1)
105	#define unlikely_notrace(x) __builtin_expect(!!(x), 0)	105	#define unlikely_notrace(x) __builtin_expect(!!(x), 0)
106		106
107	#define __branch_check__(x, expect) ({ \	107	#define __branch_check__(x, expect) ({ \
108	int ______r; \	108	int ______r; \
109	static struct ftrace_branch_data \	109	static struct ftrace_branch_data \
110	__attribute__((__aligned__(4))) \	110	__attribute__((__aligned__(4))) \
111	__attribute__((section("_ftrace_annotated_branch"))) \	111	__attribute__((section("_ftrace_annotated_branch"))) \
112	______f = { \	112	______f = { \
113	.func = __func__, \	113	.func = __func__, \
114	.file = __FILE__, \	114	.file = __FILE__, \
115	.line = __LINE__, \	115	.line = __LINE__, \
116	}; \	116	}; \
117	______r = likely_notrace(x); \	117	______r = likely_notrace(x); \
118	ftrace_likely_update(&______f, ______r, expect); \	118	ftrace_likely_update(&______f, ______r, expect); \
119	______r; \	119	______r; \
120	})	120	})
121		121
122	/*	122	/*
123	* Using __builtin_constant_p(x) to ignore cases where the return	123	* Using __builtin_constant_p(x) to ignore cases where the return
124	* value is always the same. This idea is taken from a similar patch	124	* value is always the same. This idea is taken from a similar patch
125	* written by Daniel Walker.	125	* written by Daniel Walker.
126	*/	126	*/
127	# ifndef likely	127	# ifndef likely
128	# define likely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 1))	128	# define likely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 1))
129	# endif	129	# endif
130	# ifndef unlikely	130	# ifndef unlikely
131	# define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))	131	# define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
132	# endif	132	# endif
133		133
134	#ifdef CONFIG_PROFILE_ALL_BRANCHES	134	#ifdef CONFIG_PROFILE_ALL_BRANCHES
135	/*	135	/*
136	* "Define 'is'", Bill Clinton	136	* "Define 'is'", Bill Clinton
137	* "Define 'if'", Steven Rostedt	137	* "Define 'if'", Steven Rostedt
138	*/	138	*/
139	#define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )	139	#define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
140	#define __trace_if(cond) \	140	#define __trace_if(cond) \
141	if (__builtin_constant_p((cond)) ? !!(cond) : \	141	if (__builtin_constant_p((cond)) ? !!(cond) : \
142	({ \	142	({ \
143	int ______r; \	143	int ______r; \
144	static struct ftrace_branch_data \	144	static struct ftrace_branch_data \
145	__attribute__((__aligned__(4))) \	145	__attribute__((__aligned__(4))) \
146	__attribute__((section("_ftrace_branch"))) \	146	__attribute__((section("_ftrace_branch"))) \
147	______f = { \	147	______f = { \
148	.func = __func__, \	148	.func = __func__, \
149	.file = __FILE__, \	149	.file = __FILE__, \
150	.line = __LINE__, \	150	.line = __LINE__, \
151	}; \	151	}; \
152	______r = !!(cond); \	152	______r = !!(cond); \
153	______f.miss_hit[______r]++; \	153	______f.miss_hit[______r]++; \
154	______r; \	154	______r; \
155	}))	155	}))
156	#endif /* CONFIG_PROFILE_ALL_BRANCHES */	156	#endif /* CONFIG_PROFILE_ALL_BRANCHES */
157		157
158	#else	158	#else
159	# define likely(x) __builtin_expect(!!(x), 1)	159	# define likely(x) __builtin_expect(!!(x), 1)
160	# define unlikely(x) __builtin_expect(!!(x), 0)	160	# define unlikely(x) __builtin_expect(!!(x), 0)
161	#endif	161	#endif
162		162
163	/* Optimization barrier */	163	/* Optimization barrier */
164	#ifndef barrier	164	#ifndef barrier
165	# define barrier() __memory_barrier()	165	# define barrier() __memory_barrier()
166	#endif	166	#endif
167		167
168	/* Unreachable code */	168	/* Unreachable code */
169	#ifndef unreachable	169	#ifndef unreachable
170	# define unreachable() do { } while (1)	170	# define unreachable() do { } while (1)
171	#endif	171	#endif
172		172
173	#ifndef RELOC_HIDE	173	#ifndef RELOC_HIDE
174	# define RELOC_HIDE(ptr, off) \	174	# define RELOC_HIDE(ptr, off) \
175	({ unsigned long __ptr; \	175	({ unsigned long __ptr; \
176	__ptr = (unsigned long) (ptr); \	176	__ptr = (unsigned long) (ptr); \
177	(typeof(ptr)) (__ptr + (off)); })	177	(typeof(ptr)) (__ptr + (off)); })
178	#endif	178	#endif
179		179
180	#ifndef OPTIMIZER_HIDE_VAR	180	#ifndef OPTIMIZER_HIDE_VAR
181	#define OPTIMIZER_HIDE_VAR(var) barrier()	181	#define OPTIMIZER_HIDE_VAR(var) barrier()
182	#endif	182	#endif
183		183
184	/* Not-quite-unique ID. */	184	/* Not-quite-unique ID. */
185	#ifndef __UNIQUE_ID	185	#ifndef __UNIQUE_ID
186	# define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __LINE__)	186	# define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __LINE__)
187	#endif	187	#endif
-		188
-		189	#include
-		190
-		191	static __always_inline void data_access_exceeds_word_size(void)
-		192	#ifdef __compiletime_warning
-		193	__compiletime_warning("data access exceeds word size and won't be atomic")
-		194	#endif
-		195	;
-		196
-		197	static __always_inline void data_access_exceeds_word_size(void)
-		198	{
-		199	}
-		200
-		201	static __always_inline void __read_once_size(volatile void p, void res, int size)
-		202	{
-		203	switch (size) {
-		204	case 1: (__u8 )res = (volatile __u8 )p; break;
-		205	case 2: (__u16 )res = (volatile __u16 )p; break;
-		206	case 4: (__u32 )res = (volatile __u32 )p; break;
-		207	#ifdef CONFIG_64BIT
-		208	case 8: (__u64 )res = (volatile __u64 )p; break;
-		209	#endif
-		210	default:
-		211	barrier();
-		212	__builtin_memcpy((void )res, (const void )p, size);
-		213	data_access_exceeds_word_size();
-		214	barrier();
-		215	}
-		216	}
-		217
-		218	static __always_inline void __assign_once_size(volatile void p, void res, int size)
-		219	{
-		220	switch (size) {
-		221	case 1: (volatile __u8 )p = (__u8 )res; break;
-		222	case 2: (volatile __u16 )p = (__u16 )res; break;
-		223	case 4: (volatile __u32 )p = (__u32 )res; break;
-		224	#ifdef CONFIG_64BIT
-		225	case 8: (volatile __u64 )p = (__u64 )res; break;
-		226	#endif
-		227	default:
-		228	barrier();
-		229	__builtin_memcpy((void )p, (const void )res, size);
-		230	data_access_exceeds_word_size();
-		231	barrier();
-		232	}
-		233	}
-		234
-		235	/*
-		236	* Prevent the compiler from merging or refetching reads or writes. The
-		237	* compiler is also forbidden from reordering successive instances of
-		238	* READ_ONCE, ASSIGN_ONCE and ACCESS_ONCE (see below), but only when the
-		239	* compiler is aware of some particular ordering. One way to make the
-		240	* compiler aware of ordering is to put the two invocations of READ_ONCE,
-		241	* ASSIGN_ONCE or ACCESS_ONCE() in different C statements.
-		242	*
-		243	* In contrast to ACCESS_ONCE these two macros will also work on aggregate
-		244	* data types like structs or unions. If the size of the accessed data
-		245	* type exceeds the word size of the machine (e.g., 32 bits or 64 bits)
-		246	* READ_ONCE() and ASSIGN_ONCE() will fall back to memcpy and print a
-		247	* compile-time warning.
-		248	*
-		249	* Their two major use cases are: (1) Mediating communication between
-		250	* process-level code and irq/NMI handlers, all running on the same CPU,
-		251	* and (2) Ensuring that the compiler does not fold, spindle, or otherwise
-		252	* mutilate accesses that either do not require ordering or that interact
-		253	* with an explicit memory barrier or atomic instruction that provides the
-		254	* required ordering.
-		255	*/
-		256
-		257	#define READ_ONCE(x) \
-		258	({ typeof(x) __val; __read_once_size(&x, &__val, sizeof(__val)); __val; })
-		259
-		260	#define ASSIGN_ONCE(val, x) \
-		261	({ typeof(x) __val; __val = val; __assign_once_size(&x, &__val, sizeof(__val)); __val; })
188		262
189	#endif /* __KERNEL__ */	263	#endif /* __KERNEL__ */
190		264
191	#endif /* __ASSEMBLY__ */	265	#endif /* __ASSEMBLY__ */
192		266
193	#ifdef __KERNEL__	267	#ifdef __KERNEL__
194	/*	268	/*
195	* Allow us to mark functions as 'deprecated' and have gcc emit a nice	269	* Allow us to mark functions as 'deprecated' and have gcc emit a nice
196	* warning for each use, in hopes of speeding the functions removal.	270	* warning for each use, in hopes of speeding the functions removal.
197	* Usage is:	271	* Usage is:
198	* int __deprecated foo(void)	272	* int __deprecated foo(void)
199	*/	273	*/
200	#ifndef __deprecated	274	#ifndef __deprecated
201	# define __deprecated /* unimplemented */	275	# define __deprecated /* unimplemented */
202	#endif	276	#endif
203		277
204	#ifdef MODULE	278	#ifdef MODULE
205	#define __deprecated_for_modules __deprecated	279	#define __deprecated_for_modules __deprecated
206	#else	280	#else
207	#define __deprecated_for_modules	281	#define __deprecated_for_modules
208	#endif	282	#endif
209		283
210	#ifndef __must_check	284	#ifndef __must_check
211	#define __must_check	285	#define __must_check
212	#endif	286	#endif
213		287
214	#ifndef CONFIG_ENABLE_MUST_CHECK	288	#ifndef CONFIG_ENABLE_MUST_CHECK
215	#undef __must_check	289	#undef __must_check
216	#define __must_check	290	#define __must_check
217	#endif	291	#endif
218	#ifndef CONFIG_ENABLE_WARN_DEPRECATED	292	#ifndef CONFIG_ENABLE_WARN_DEPRECATED
219	#undef __deprecated	293	#undef __deprecated
220	#undef __deprecated_for_modules	294	#undef __deprecated_for_modules
221	#define __deprecated	295	#define __deprecated
222	#define __deprecated_for_modules	296	#define __deprecated_for_modules
223	#endif	297	#endif
224		298
225	/*	299	/*
226	* Allow us to avoid 'defined but not used' warnings on functions and data,	300	* Allow us to avoid 'defined but not used' warnings on functions and data,
227	* as well as force them to be emitted to the assembly file.	301	* as well as force them to be emitted to the assembly file.
228	*	302	*
229	* As of gcc 3.4, static functions that are not marked with attribute((used))	303	* As of gcc 3.4, static functions that are not marked with attribute((used))
230	* may be elided from the assembly file. As of gcc 3.4, static data not so	304	* may be elided from the assembly file. As of gcc 3.4, static data not so
231	* marked will not be elided, but this may change in a future gcc version.	305	* marked will not be elided, but this may change in a future gcc version.
232	*	306	*
233	* NOTE: Because distributions shipped with a backported unit-at-a-time	307	* NOTE: Because distributions shipped with a backported unit-at-a-time
234	* compiler in gcc 3.3, we must define __used to be __attribute__((used))	308	* compiler in gcc 3.3, we must define __used to be __attribute__((used))
235	* for gcc >=3.3 instead of 3.4.	309	* for gcc >=3.3 instead of 3.4.
236	*	310	*
237	* In prior versions of gcc, such functions and data would be emitted, but	311	* In prior versions of gcc, such functions and data would be emitted, but
238	* would be warned about except with attribute((unused)).	312	* would be warned about except with attribute((unused)).
239	*	313	*
240	* Mark functions that are referenced only in inline assembly as __used so	314	* Mark functions that are referenced only in inline assembly as __used so
241	* the code is emitted even though it appears to be unreferenced.	315	* the code is emitted even though it appears to be unreferenced.
242	*/	316	*/
243	#ifndef __used	317	#ifndef __used
244	# define __used /* unimplemented */	318	# define __used /* unimplemented */
245	#endif	319	#endif
246		320
247	#ifndef __maybe_unused	321	#ifndef __maybe_unused
248	# define __maybe_unused /* unimplemented */	322	# define __maybe_unused /* unimplemented */
249	#endif	323	#endif
250		324
251	#ifndef __always_unused	325	#ifndef __always_unused
252	# define __always_unused /* unimplemented */	326	# define __always_unused /* unimplemented */
253	#endif	327	#endif
254		328
255	#ifndef noinline	329	#ifndef noinline
256	#define noinline	330	#define noinline
257	#endif	331	#endif
258		332
259	/*	333	/*
260	* Rather then using noinline to prevent stack consumption, use	334	* Rather then using noinline to prevent stack consumption, use
261	* noinline_for_stack instead. For documentation reasons.	335	* noinline_for_stack instead. For documentation reasons.
262	*/	336	*/
263	#define noinline_for_stack noinline	337	#define noinline_for_stack noinline
264		338
265	#ifndef __always_inline	339	#ifndef __always_inline
266	#define __always_inline inline	340	#define __always_inline inline
267	#endif	341	#endif
268		342
269	#endif /* __KERNEL__ */	343	#endif /* __KERNEL__ */
270		344
271	/*	345	/*
272	* From the GCC manual:	346	* From the GCC manual:
273	*	347	*
274	* Many functions do not examine any values except their arguments,	348	* Many functions do not examine any values except their arguments,
275	* and have no effects except the return value. Basically this is	349	* and have no effects except the return value. Basically this is
276	* just slightly more strict class than the `pure' attribute above,	350	* just slightly more strict class than the `pure' attribute above,
277	* since function is not allowed to read global memory.	351	* since function is not allowed to read global memory.
278	*	352	*
279	* Note that a function that has pointer arguments and examines the	353	* Note that a function that has pointer arguments and examines the
280	* data pointed to must _not_ be declared `const'. Likewise, a	354	* data pointed to must _not_ be declared `const'. Likewise, a
281	* function that calls a non-`const' function usually must not be	355	* function that calls a non-`const' function usually must not be
282	* `const'. It does not make sense for a `const' function to return	356	* `const'. It does not make sense for a `const' function to return
283	* `void'.	357	* `void'.
284	*/	358	*/
285	#ifndef __attribute_const__	359	#ifndef __attribute_const__
286	# define __attribute_const__ /* unimplemented */	360	# define __attribute_const__ /* unimplemented */
287	#endif	361	#endif
288		362
289	/*	363	/*
290	* Tell gcc if a function is cold. The compiler will assume any path	364	* Tell gcc if a function is cold. The compiler will assume any path
291	* directly leading to the call is unlikely.	365	* directly leading to the call is unlikely.
292	*/	366	*/
293		367
294	#ifndef __cold	368	#ifndef __cold
295	#define __cold	369	#define __cold
296	#endif	370	#endif
297		371
298	/* Simple shorthand for a section definition */	372	/* Simple shorthand for a section definition */
299	#ifndef __section	373	#ifndef __section
300	# define __section(S) __attribute__ ((__section__(#S)))	374	# define __section(S) __attribute__ ((__section__(#S)))
301	#endif	375	#endif
302		376
303	#ifndef __visible	377	#ifndef __visible
304	#define __visible	378	#define __visible
305	#endif	379	#endif
306		380
307	/* Are two types/vars the same type (ignoring qualifiers)? */	381	/* Are two types/vars the same type (ignoring qualifiers)? */
308	#ifndef __same_type	382	#ifndef __same_type
309	# define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))	383	# define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
310	#endif	384	#endif
311		385
312	/* Is this type a native word size -- useful for atomic operations */	386	/* Is this type a native word size -- useful for atomic operations */
313	#ifndef __native_word	387	#ifndef __native_word
314	# define __native_word(t) (sizeof(t) == sizeof(int) \|\| sizeof(t) == sizeof(long))	388	# define __native_word(t) (sizeof(t) == sizeof(int) \|\| sizeof(t) == sizeof(long))
315	#endif	389	#endif
316		390
317	/* Compile time object size, -1 for unknown */	391	/* Compile time object size, -1 for unknown */
318	#ifndef __compiletime_object_size	392	#ifndef __compiletime_object_size
319	# define __compiletime_object_size(obj) -1	393	# define __compiletime_object_size(obj) -1
320	#endif	394	#endif
321	#ifndef __compiletime_warning	395	#ifndef __compiletime_warning
322	# define __compiletime_warning(message)	396	# define __compiletime_warning(message)
323	#endif	397	#endif
324	#ifndef __compiletime_error	398	#ifndef __compiletime_error
325	# define __compiletime_error(message)	399	# define __compiletime_error(message)
326	/*	400	/*
327	* Sparse complains of variable sized arrays due to the temporary variable in	401	* Sparse complains of variable sized arrays due to the temporary variable in
328	* __compiletime_assert. Unfortunately we can't just expand it out to make	402	* __compiletime_assert. Unfortunately we can't just expand it out to make
329	* sparse see a constant array size without breaking compiletime_assert on old	403	* sparse see a constant array size without breaking compiletime_assert on old
330	* versions of GCC (e.g. 4.2.4), so hide the array from sparse altogether.	404	* versions of GCC (e.g. 4.2.4), so hide the array from sparse altogether.
331	*/	405	*/
332	# ifndef __CHECKER__	406	# ifndef __CHECKER__
333	# define __compiletime_error_fallback(condition) \	407	# define __compiletime_error_fallback(condition) \
334	do { ((void)sizeof(char[1 - 2 * condition])); } while (0)	408	do { ((void)sizeof(char[1 - 2 * condition])); } while (0)
335	# endif	409	# endif
336	#endif	410	#endif
337	#ifndef __compiletime_error_fallback	411	#ifndef __compiletime_error_fallback
338	# define __compiletime_error_fallback(condition) do { } while (0)	412	# define __compiletime_error_fallback(condition) do { } while (0)
339	#endif	413	#endif
340		414
341	#define __compiletime_assert(condition, msg, prefix, suffix) \	415	#define __compiletime_assert(condition, msg, prefix, suffix) \
342	do { \	416	do { \
343	bool __cond = !(condition); \	417	bool __cond = !(condition); \
344	extern void prefix ## suffix(void) __compiletime_error(msg); \	418	extern void prefix ## suffix(void) __compiletime_error(msg); \
345	if (__cond) \	419	if (__cond) \
346	prefix ## suffix(); \	420	prefix ## suffix(); \
347	__compiletime_error_fallback(__cond); \	421	__compiletime_error_fallback(__cond); \
348	} while (0)	422	} while (0)
349		423
350	#define _compiletime_assert(condition, msg, prefix, suffix) \	424	#define _compiletime_assert(condition, msg, prefix, suffix) \
351	__compiletime_assert(condition, msg, prefix, suffix)	425	__compiletime_assert(condition, msg, prefix, suffix)
352		426
353	/**	427	/**
354	* compiletime_assert - break build and emit msg if condition is false	428	* compiletime_assert - break build and emit msg if condition is false
355	* @condition: a compile-time constant condition to check	429	* @condition: a compile-time constant condition to check
356	* @msg: a message to emit if condition is false	430	* @msg: a message to emit if condition is false
357	*	431	*
358	* In tradition of POSIX assert, this macro will break the build if the	432	* In tradition of POSIX assert, this macro will break the build if the
359	* supplied condition is false, emitting the supplied error message if the	433	* supplied condition is false, emitting the supplied error message if the
360	* compiler has support to do so.	434	* compiler has support to do so.
361	*/	435	*/
362	#define compiletime_assert(condition, msg) \	436	#define compiletime_assert(condition, msg) \
363	_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)	437	_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
364		438
365	#define compiletime_assert_atomic_type(t) \	439	#define compiletime_assert_atomic_type(t) \
366	compiletime_assert(__native_word(t), \	440	compiletime_assert(__native_word(t), \
367	"Need native word sized stores/loads for atomicity.")	441	"Need native word sized stores/loads for atomicity.")
368		442
369	/*	443	/*
370	* Prevent the compiler from merging or refetching accesses. The compiler	444	* Prevent the compiler from merging or refetching accesses. The compiler
371	* is also forbidden from reordering successive instances of ACCESS_ONCE(),	445	* is also forbidden from reordering successive instances of ACCESS_ONCE(),
372	* but only when the compiler is aware of some particular ordering. One way	446	* but only when the compiler is aware of some particular ordering. One way
373	* to make the compiler aware of ordering is to put the two invocations of	447	* to make the compiler aware of ordering is to put the two invocations of
374	* ACCESS_ONCE() in different C statements.	448	* ACCESS_ONCE() in different C statements.
375	*	449	*
376	* This macro does absolutely -nothing- to prevent the CPU from reordering,	450	* This macro does absolutely -nothing- to prevent the CPU from reordering,
377	* merging, or refetching absolutely anything at any time. Its main intended	451	* merging, or refetching absolutely anything at any time. Its main intended
378	* use is to mediate communication between process-level code and irq/NMI	452	* use is to mediate communication between process-level code and irq/NMI
379	* handlers, all running on the same CPU.	453	* handlers, all running on the same CPU.
380	*/	454	*/
381	#define ACCESS_ONCE(x) ((volatile typeof(x) )&(x))	455	#define ACCESS_ONCE(x) ((volatile typeof(x) )&(x))
382		456
383	/* Ignore/forbid kprobes attach on very low level functions marked by this attribute: */	457	/* Ignore/forbid kprobes attach on very low level functions marked by this attribute: */
384	#ifdef CONFIG_KPROBES	458	#ifdef CONFIG_KPROBES
385	# define __kprobes __attribute__((__section__(".kprobes.text")))	459	# define __kprobes __attribute__((__section__(".kprobes.text")))
386	# define nokprobe_inline __always_inline	460	# define nokprobe_inline __always_inline
387	#else	461	#else
388	# define __kprobes	462	# define __kprobes
389	# define nokprobe_inline inline	463	# define nokprobe_inline inline
390	#endif	464	#endif
391	#endif /* __LINUX_COMPILER_H */	465	#endif /* __LINUX_COMPILER_H */

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(root)/drivers/include/linux/compiler.h – Rev 5056 → 5270