Messages in this thread Patch in this message | | | From | Igor Stoppa <> | Subject | [PATCH] asm-generic: bug: add unlikely() to BUG_ON() | Date | Fri, 7 Sep 2018 22:21:19 +0300 |
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Add a hint to the compiler. If BUG_ON() is used instead of BUG(), it means that probably the preferred outcome is to not BUG().
The optimization is disabled, in case CONFIG_PROFILE_ANNOTATED_BRANCHES is turned on.
Signed-off-by: Igor Stoppa <igor.stoppa@huawei.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org --- include/asm-generic/bug.h | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h index 20561a60db9c..bf47584eab2a 100644 --- a/include/asm-generic/bug.h +++ b/include/asm-generic/bug.h @@ -183,7 +183,11 @@ void __warn(const char *file, int line, void *caller, unsigned taint, #endif #ifndef HAVE_ARCH_BUG_ON +#ifdef CONFIG_PROFILE_ANNOTATED_BRANCHES #define BUG_ON(condition) do { if (condition) BUG(); } while (0) +#else +#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0) +#endif #endif #ifndef HAVE_ARCH_WARN_ON -- 2.17.1
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