diff options
| author | Daniel Santos <[email protected]> | 2013-02-21 16:41:45 -0800 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2013-02-21 17:22:16 -0800 |
| commit | 1d6a0d19c85587581a364850b77f30446810a560 (patch) | |
| tree | f82e7ac260a7705459c77bd37bf2733047542921 | |
| parent | ca623c914e82c3351cd657073fdb24a1df8c27b9 (diff) | |
bug.h: prevent double evaulation of `condition' in BUILD_BUG_ON
When calling BUILD_BUG_ON in an optimized build using gcc 4.3 and later,
the condition will be evaulated twice, possibily with side-effects. This
patch eliminates that error.
[[email protected]: tweak code layout]
Signed-off-by: Daniel Santos <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Joe Perches <[email protected]>
Cc: Josh Triplett <[email protected]>
Cc: Paul Gortmaker <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
| -rw-r--r-- | include/linux/bug.h | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/include/linux/bug.h b/include/linux/bug.h index 27d404f91b3e..89fb91d0c929 100644 --- a/include/linux/bug.h +++ b/include/linux/bug.h @@ -59,9 +59,10 @@ struct pt_regs; extern int __build_bug_on_failed; #define BUILD_BUG_ON(condition) \ do { \ - ((void)sizeof(char[1 - 2*!!(condition)])); \ - if (condition) __build_bug_on_failed = 1; \ - } while(0) + bool __cond = !!(condition); \ + ((void)sizeof(char[1 - 2 * __cond])); \ + if (__cond) __build_bug_on_failed = 1; \ + } while (0) #endif /** |