This effectively causes BUG() to act like a function with the noreturn
attribute, which prevents GCC from warning about the code that follows
BUG() (for instance, warning about not returning a value in a non-void
function after calling BUG()).
This actually makes the kernel smaller; bloat-o-meter summary:
add/remove: 2/7 grow/shrink: 34/57 up/down: 475/-1233 (-758)
Signed-off-by: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
---
include/asm-generic/bug.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index 653c44a..5f69248 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -134,7 +134,7 @@ extern void warn_slowpath_null(const char *file, const int line);
#else /* !CONFIG_BUG */
#ifndef HAVE_ARCH_BUG
-#define BUG() do {} while (0)
+#define BUG() do { unreachable(); } while (0)
#endif
#ifndef HAVE_ARCH_WARN_ON
--
1.9.0
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