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-rw-r--r--arch/powerpc/include/asm/barrier.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/barrier.h b/arch/powerpc/include/asm/barrier.h
index c0deafc212b8..25d42bd3f114 100644
--- a/arch/powerpc/include/asm/barrier.h
+++ b/arch/powerpc/include/asm/barrier.h
@@ -74,6 +74,11 @@ do { \
___p1; \
})
+/*
+ * This must resolve to hwsync on SMP for the context switch path.
+ * See _switch, and core scheduler context switch memory ordering
+ * comments.
+ */
#define smp_mb__before_spinlock() smp_mb()
#include <asm-generic/barrier.h>