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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-04-04 08:36:15 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-04-04 08:36:15 -0700 |
| commit | fb9a7d76da108d120efb2258ea83b18dbbb2ecdd (patch) | |
| tree | f93f0eed000ed5d17cd728c7f8b05f489dde1e9a /include/asm-generic/bug.h | |
| parent | usb/serial: fix function args warnings, dropping *filp (diff) | |
| parent | Merge branch 'rcu/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/pa... (diff) | |
| download | linux-fb9a7d76da108d120efb2258ea83b18dbbb2ecdd.tar.gz linux-fb9a7d76da108d120efb2258ea83b18dbbb2ecdd.zip | |
Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
rcu: create new rcu_access_index() and use in mce
WARN_ON_SMP(): Add comment to explain ({0;})
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 f2d2faf4d9ae..e5a3f5880001 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 |