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| author | Ingo Molnar <mingo@elte.hu> | 2011-04-19 07:55:58 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-04-19 07:56:17 +0200 |
| commit | 68d2cf25d39324c54b5e42de7915c623a0917abe (patch) | |
| tree | ff1291450d7e6630bc77ec1363c3db8d74fa58b0 /include/asm-generic/bug.h | |
| parent | 176fcc5c5f0131504a55e1e1d35389c49a9177c2 (diff) | |
| parent | 5d2cd90922c778908bd0cd669e572a5b5eafd737 (diff) | |
Merge branch 'perf/urgent' into perf/core
Merge reason: we'll be queueing up dependent changes.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-generic/bug.h')
| -rw-r--r-- | include/asm-generic/bug.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h index f2d2faf4d9a..e5a3f588000 100644 --- a/include/asm-generic/bug.h +++ b/include/asm-generic/bug.h @@ -194,6 +194,13 @@ extern void warn_slowpath_null(const char *file, const int line); #ifdef CONFIG_SMP # define WARN_ON_SMP(x) WARN_ON(x) #else +/* + * Use of ({0;}) because WARN_ON_SMP(x) may be used either as + * a stand alone line statement or as a condition in an if () + * statement. + * A simple "0" would cause gcc to give a "statement has no effect" + * warning. + */ # define WARN_ON_SMP(x) ({0;}) #endif |