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bug.h: sync BUILD_BUG stuff with Linux 4.13
As commit 84b8bf6d5d ("bug.h: move BUILD_BUG_* defines to
include/linux/bug.h") noted, include/linux/bug.h was locally
modified for U-Boot because the name conflict of error() caused
build errors at that time.
Now error() is gone, so we can fully sync BUILD_BUG* with Linux.
These macros are just compile-time utilities. Nothing depends on
platform code, so it should make sense to simply copy Linux's ones.
Please note Linux split BUILD_BUG stuff out into <linux/build_bug.h>
by commit bc6245e5efd7. Let's follow it.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Masahiro Yamada
committed by
Tom Rini
Tom Rini
parent
f7d6b896d6
commit
059a48096c
@@ -1,55 +1,6 @@
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#ifndef _LINUX_BUG_H
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#define _LINUX_BUG_H
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#include <linux/compiler.h>
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#ifdef __CHECKER__
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#define BUILD_BUG_ON_NOT_POWER_OF_2(n) (0)
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#define BUILD_BUG_ON_ZERO(e) (0)
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#define BUILD_BUG_ON_NULL(e) ((void*)0)
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#define BUILD_BUG_ON_INVALID(e) (0)
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#define BUILD_BUG_ON(condition) (0)
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#define BUILD_BUG() (0)
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#else /* __CHECKER__ */
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/* Force a compilation error if a constant expression is not a power of 2 */
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#define BUILD_BUG_ON_NOT_POWER_OF_2(n) \
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BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
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/* Force a compilation error if condition is true, but also produce a
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result (of value 0 and type size_t), so the expression can be used
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e.g. in a structure initializer (or where-ever else comma expressions
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aren't permitted). */
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#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
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#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
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/*
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* BUILD_BUG_ON_INVALID() permits the compiler to check the validity of the
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* expression but avoids the generation of any code, even if that expression
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* has side-effects.
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*/
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#define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e))))
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/**
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* BUILD_BUG_ON - break compile if a condition is true.
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* @condition: the condition which the compiler should know is false.
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*
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* If you have some code which relies on certain constants being equal, or
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* some other compile-time-evaluated condition, you should use BUILD_BUG_ON to
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* detect if someone changes it.
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*
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* The implementation uses gcc's reluctance to create a negative array, but gcc
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* (as of 4.4) only emits that error for obvious cases (e.g. not arguments to
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* inline functions). Luckily, in 4.3 they added the "error" function
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* attribute just for this type of case. Thus, we use a negative sized array
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* (should always create an error on gcc versions older than 4.4) and then call
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* an undefined function with the error attribute (should always create an
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* error on gcc 4.3 and later). If for some reason, neither creates a
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* compile-time error, we'll still have a link-time error, which is harder to
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* track down.
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*/
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#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
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#endif /* __CHECKER__ */
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#include <linux/build_bug.h>
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#endif /* _LINUX_BUG_H */
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84
include/linux/build_bug.h
Normal file
84
include/linux/build_bug.h
Normal file
@@ -0,0 +1,84 @@
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#ifndef _LINUX_BUILD_BUG_H
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#define _LINUX_BUILD_BUG_H
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#include <linux/compiler.h>
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#ifdef __CHECKER__
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#define __BUILD_BUG_ON_NOT_POWER_OF_2(n) (0)
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#define BUILD_BUG_ON_NOT_POWER_OF_2(n) (0)
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#define BUILD_BUG_ON_ZERO(e) (0)
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#define BUILD_BUG_ON_NULL(e) ((void *)0)
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#define BUILD_BUG_ON_INVALID(e) (0)
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#define BUILD_BUG_ON_MSG(cond, msg) (0)
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#define BUILD_BUG_ON(condition) (0)
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#define BUILD_BUG() (0)
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#else /* __CHECKER__ */
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/* Force a compilation error if a constant expression is not a power of 2 */
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#define __BUILD_BUG_ON_NOT_POWER_OF_2(n) \
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BUILD_BUG_ON(((n) & ((n) - 1)) != 0)
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#define BUILD_BUG_ON_NOT_POWER_OF_2(n) \
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BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
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/*
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* Force a compilation error if condition is true, but also produce a
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* result (of value 0 and type size_t), so the expression can be used
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* e.g. in a structure initializer (or where-ever else comma expressions
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* aren't permitted).
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*/
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#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:(-!!(e)); }))
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#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:(-!!(e)); }))
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/*
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* BUILD_BUG_ON_INVALID() permits the compiler to check the validity of the
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* expression but avoids the generation of any code, even if that expression
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* has side-effects.
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*/
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#define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e))))
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/**
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* BUILD_BUG_ON_MSG - break compile if a condition is true & emit supplied
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* error message.
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* @condition: the condition which the compiler should know is false.
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*
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* See BUILD_BUG_ON for description.
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*/
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#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
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/**
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* BUILD_BUG_ON - break compile if a condition is true.
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* @condition: the condition which the compiler should know is false.
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*
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* If you have some code which relies on certain constants being equal, or
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* some other compile-time-evaluated condition, you should use BUILD_BUG_ON to
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* detect if someone changes it.
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*
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* The implementation uses gcc's reluctance to create a negative array, but gcc
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* (as of 4.4) only emits that error for obvious cases (e.g. not arguments to
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* inline functions). Luckily, in 4.3 they added the "error" function
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* attribute just for this type of case. Thus, we use a negative sized array
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* (should always create an error on gcc versions older than 4.4) and then call
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* an undefined function with the error attribute (should always create an
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* error on gcc 4.3 and later). If for some reason, neither creates a
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* compile-time error, we'll still have a link-time error, which is harder to
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* track down.
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*/
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#ifndef __OPTIMIZE__
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#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
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#else
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#define BUILD_BUG_ON(condition) \
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BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
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#endif
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/**
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* BUILD_BUG - break compile if used.
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*
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* If you have some code that you expect the compiler to eliminate at
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* build time, you should use BUILD_BUG to detect if it is
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* unexpectedly used.
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*/
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#define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
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#endif /* __CHECKER__ */
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#endif /* _LINUX_BUILD_BUG_H */
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@@ -476,7 +476,8 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
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# define __compiletime_error_fallback(condition) do { } while (0)
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#endif
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#define __compiletime_assert(condition, msg, prefix, suffix) \
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#ifdef __OPTIMIZE__
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# define __compiletime_assert(condition, msg, prefix, suffix) \
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do { \
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bool __cond = !(condition); \
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extern void prefix ## suffix(void) __compiletime_error(msg); \
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@@ -484,6 +485,9 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
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prefix ## suffix(); \
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__compiletime_error_fallback(__cond); \
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} while (0)
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#else
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# define __compiletime_assert(condition, msg, prefix, suffix) do { } while (0)
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#endif
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#define _compiletime_assert(condition, msg, prefix, suffix) \
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__compiletime_assert(condition, msg, prefix, suffix)
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