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authorMasahiro Yamada <yamada.masahiro@socionext.com>2017-09-16 14:10:44 +0900
committerTom Rini <trini@konsulko.com>2017-10-04 12:00:19 -0400
commit059a48096c883e98bc1a4a561abc0069f44cbfea (patch)
treec6652ba59c9636950bd4b1ea4f90a9266c69c5eb /include/linux/bug.h
parentf7d6b896d641767e04409fc3abf05338b19d9109 (diff)
bug.h: sync BUILD_BUG stuff with Linux 4.13
As commit 84b8bf6d5d2a ("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>
Diffstat (limited to 'include/linux/bug.h')
-rw-r--r--include/linux/bug.h51
1 files changed, 1 insertions, 50 deletions
diff --git a/include/linux/bug.h b/include/linux/bug.h
index 920e3796c3..133544ca46 100644
--- a/include/linux/bug.h
+++ b/include/linux/bug.h
@@ -1,55 +1,6 @@
#ifndef _LINUX_BUG_H
#define _LINUX_BUG_H
-#include <linux/compiler.h>
-
-#ifdef __CHECKER__
-#define BUILD_BUG_ON_NOT_POWER_OF_2(n) (0)
-#define BUILD_BUG_ON_ZERO(e) (0)
-#define BUILD_BUG_ON_NULL(e) ((void*)0)
-#define BUILD_BUG_ON_INVALID(e) (0)
-#define BUILD_BUG_ON(condition) (0)
-#define BUILD_BUG() (0)
-#else /* __CHECKER__ */
-
-/* Force a compilation error if a constant expression is not a power of 2 */
-#define BUILD_BUG_ON_NOT_POWER_OF_2(n) \
- BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
-
-/* Force a compilation error if condition is true, but also produce a
- result (of value 0 and type size_t), so the expression can be used
- e.g. in a structure initializer (or where-ever else comma expressions
- aren't permitted). */
-#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
-#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
-
-/*
- * BUILD_BUG_ON_INVALID() permits the compiler to check the validity of the
- * expression but avoids the generation of any code, even if that expression
- * has side-effects.
- */
-#define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e))))
-
-/**
- * BUILD_BUG_ON - break compile if a condition is true.
- * @condition: the condition which the compiler should know is false.
- *
- * If you have some code which relies on certain constants being equal, or
- * some other compile-time-evaluated condition, you should use BUILD_BUG_ON to
- * detect if someone changes it.
- *
- * The implementation uses gcc's reluctance to create a negative array, but gcc
- * (as of 4.4) only emits that error for obvious cases (e.g. not arguments to
- * inline functions). Luckily, in 4.3 they added the "error" function
- * attribute just for this type of case. Thus, we use a negative sized array
- * (should always create an error on gcc versions older than 4.4) and then call
- * an undefined function with the error attribute (should always create an
- * error on gcc 4.3 and later). If for some reason, neither creates a
- * compile-time error, we'll still have a link-time error, which is harder to
- * track down.
- */
-#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
-
-#endif /* __CHECKER__ */
+#include <linux/build_bug.h>
#endif /* _LINUX_BUG_H */