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| author |   Josh Triplett <josh@joshtriplett.org> | 2014-04-07 15:39:14 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-07 16:36:10 -0700 |
| commit | b06dd879f5db33c1d7f5ab516ea671627f99c0c9 (patch) | |
| tree | 85ee4edf96b8cdc094104afe8fd0ef204df452cc /arch | |
| parent | bug: Make BUG() always stop the machine (diff) | |
| download | linux-dev-b06dd879f5db33c1d7f5ab516ea671627f99c0c9.tar.xz linux-dev-b06dd879f5db33c1d7f5ab516ea671627f99c0c9.zip | |
x86: always define BUG() and HAVE_ARCH_BUG, even with !CONFIG_BUG
This ensures that BUG() always has a definition that causes a trap (via
an undefined instruction), and that the compiler still recognizes the
code following BUG() as unreachable, avoiding warnings that would
otherwise appear (such as on non-void functions that don't return a
value after BUG()).
In addition to saving a few bytes over the generic infinite-loop
implementation, this implementation traps rather than looping, which
potentially allows for better error-recovery behavior (such as by
rebooting).
Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/include/asm/bug.h | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/x86/include/asm/bug.h b/arch/x86/include/asm/bug.h index 2f03ff018d36..ba38ebbaced3 100644 --- a/arch/x86/include/asm/bug.h +++ b/arch/x86/include/asm/bug.h @@ -1,7 +1,6 @@ #ifndef _ASM_X86_BUG_H #define _ASM_X86_BUG_H -#ifdef CONFIG_BUG #define HAVE_ARCH_BUG #ifdef CONFIG_DEBUG_BUGVERBOSE @@ -33,8 +32,6 @@ do { \ } while (0) #endif -#endif /* !CONFIG_BUG */ - #include <asm-generic/bug.h> #endif /* _ASM_X86_BUG_H */ |