That way arches can define the minimal versions and still #include
asm-generic for defaults (vs. defining defaults in arch code)
See new barrier.h in arc for usage !
Cc: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
---
include/asm-generic/barrier.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/include/asm-generic/barrier.h b/include/asm-generic/barrier.h
index f5c40b0fadc2..270b7c989ea1 100644
--- a/include/asm-generic/barrier.h
+++ b/include/asm-generic/barrier.h
@@ -55,17 +55,42 @@
#endif
#ifdef CONFIG_SMP
+
+#ifndef smp_mb
#define smp_mb() mb()
+#endif
+
+#ifndef smp_rmb
#define smp_rmb() rmb()
+#endif
+
+#ifndef smp_wmb
#define smp_wmb() wmb()
+#endif
+
+#ifndef smp_read_barrier_depends
#define smp_read_barrier_depends() read_barrier_depends()
+#endif
+
#else
+#ifndef smp_mb
#define smp_mb() barrier()
+#endif
+
+#ifndef smp_rmb
#define smp_rmb() barrier()
+#endif
+
+#ifndef smp_wmb
#define smp_wmb() barrier()
+#endif
+
+#ifndef smp_read_barrier_depends
#define smp_read_barrier_depends() do { } while (0)
#endif
+#endif
+
#ifndef set_mb
#define set_mb(var, value) do { (var) = (value); mb(); } while (0)
#endif
--
1.9.1
--
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