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| author | Vineet Gupta <vgupta@synopsys.com> | 2015-03-11 17:12:02 +0100 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2015-06-25 02:30:17 +0200 |
| commit | 470c27e4695add2a4e167467775081870d83185a (patch) | |
| tree | 49e14d2e7ec8dcdf2884589614783d6421c29665 /include/asm-generic | |
| parent | ARC: add smp barriers around atomics per Documentation/atomic_ops.txt (diff) | |
| download | linux-470c27e4695add2a4e167467775081870d83185a.tar.xz linux-470c27e4695add2a4e167467775081870d83185a.zip | |
arch: conditionally define smp_{mb,rmb,wmb}
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 !
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/barrier.h | 25 |
1 files changed, 25 insertions, 0 deletions
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 |