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-rw-r--r--includes/sys/sdt.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/includes/sys/sdt.h b/includes/sys/sdt.h
index d31d7326..3847c497 100644
--- a/includes/sys/sdt.h
+++ b/includes/sys/sdt.h
@@ -42,7 +42,7 @@
#if defined STAP_HAS_SEMAPHORES && defined EXPERIMENTAL_UTRACE_SDT
#define STAP_SEMAPHORE(probe) \
- if ( probe ## _semaphore )
+ if (__builtin_expect ( probe ## _semaphore , 0))
#else
#define STAP_SEMAPHORE(probe)
#endif