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-rw-r--r--arch/tile/include/asm/barrier.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/tile/include/asm/barrier.h b/arch/tile/include/asm/barrier.h
index b5a05d050a8f..96a42ae79f4d 100644
--- a/arch/tile/include/asm/barrier.h
+++ b/arch/tile/include/asm/barrier.h
@@ -72,6 +72,20 @@ mb_incoherent(void)
#define mb() fast_mb()
#define iob() fast_iob()
+#ifndef __tilegx__ /* 32 bit */
+/*
+ * We need to barrier before modifying the word, since the _atomic_xxx()
+ * routines just tns the lock and then read/modify/write of the word.
+ * But after the word is updated, the routine issues an "mf" before returning,
+ * and since it's a function call, we don't even need a compiler barrier.
+ */
+#define smp_mb__before_atomic() smp_mb()
+#define smp_mb__after_atomic() do { } while (0)
+#else /* 64 bit */
+#define smp_mb__before_atomic() smp_mb()
+#define smp_mb__after_atomic() smp_mb()
+#endif
+
#include <asm-generic/barrier.h>
#endif /* !__ASSEMBLY__ */