Messages in this thread Patch in this message | | | From | Masahiro Yamada <> | Subject | [PATCH v2 2/2] build_bug.h: remove all dummy BUILD_BUG_ON stubs for sparse | Date | Fri, 16 Nov 2018 15:27:25 +0900 |
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The introduction of these dummy BUILD_BUG_ON stubs dates back to commit 903c0c7cdc21 ("sparse: define dummy BUILD_BUG_ON definition for sparse"). At that time, BUILD_BUG_ON() was implemented with the negative array trick, which Sparse complains about even if the condition can be optimized and evaluated to 0 at compile-time.
With the previous commit, the leftover negative array trick is gone. Sparse is happy with the current BUILD_BUG_ON(), which is implemented by using the 'error' attribute.
There might be a little room for argument about BUILD_BUG_ON_ZERO(). Sparse reports 'invalid bitfield width, -1' for non-zero value, and 'bad integer constant expression' for non-constant value. This is the same criteria as GCC uses. So, if those Sparse errors occurred, they would cause errors for GCC as well. (Hence, such errors would have been detected by the normal compile test process.)
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> ---
Changes in v2: - Fix a coding style error (two consecutive blank lines)
include/linux/build_bug.h | 12 ------------ 1 file changed, 12 deletions(-)
diff --git a/include/linux/build_bug.h b/include/linux/build_bug.h index d415c64..6625c88 100644 --- a/include/linux/build_bug.h +++ b/include/linux/build_bug.h @@ -4,16 +4,6 @@ #include <linux/compiler.h> -#ifdef __CHECKER__ -#define __BUILD_BUG_ON_NOT_POWER_OF_2(n) (0) -#define BUILD_BUG_ON_NOT_POWER_OF_2(n) (0) -#define BUILD_BUG_ON_ZERO(e) (0) -#define BUILD_BUG_ON_INVALID(e) (0) -#define BUILD_BUG_ON_MSG(cond, msg) (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) & ((n) - 1)) != 0) @@ -64,6 +54,4 @@ */ #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed") -#endif /* __CHECKER__ */ - #endif /* _LINUX_BUILD_BUG_H */ -- 2.7.4
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