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| author | Michael S. Tsirkin <mst@redhat.com> | 2015-12-27 15:04:42 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2016-01-12 20:46:55 +0200 |
| commit | afc22de0c0ca8b4697a8aec2bbb35d4cc385e7e0 (patch) | |
| tree | 7c920440e0da786b1d2c3617f111f6afa2aac33d | |
| parent | eebd1b927822f13429ec09d0a48fe92716b22840 (diff) | |
| download | linux-afc22de0c0ca8b4697a8aec2bbb35d4cc385e7e0.tar.bz2 | |
metag: define __smp_xxx
This defines __smp_xxx barriers for metag,
for use by virtualization.
smp_xxx barriers are removed as they are
defined correctly by asm-generic/barriers.h
Note: as __smp_XX macros should not depend on CONFIG_SMP, they can not
use the existing fence() macro since that is defined differently between
SMP and !SMP. For this reason, this patch introduces a wrapper
metag_fence() that doesn't depend on CONFIG_SMP.
fence() is then defined using that, depending on CONFIG_SMP.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: James Hogan <james.hogan@imgtec.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
| -rw-r--r-- | arch/metag/include/asm/barrier.h | 32 |
1 files changed, 15 insertions, 17 deletions
diff --git a/arch/metag/include/asm/barrier.h b/arch/metag/include/asm/barrier.h index b5b778bb0b33..5418517aa5eb 100644 --- a/arch/metag/include/asm/barrier.h +++ b/arch/metag/include/asm/barrier.h @@ -44,13 +44,6 @@ static inline void wr_fence(void) #define rmb() barrier() #define wmb() mb() -#ifndef CONFIG_SMP -#define fence() do { } while (0) -#define smp_mb() barrier() -#define smp_rmb() barrier() -#define smp_wmb() barrier() -#else - #ifdef CONFIG_METAG_SMP_WRITE_REORDERING /* * Write to the atomic memory unlock system event register (command 0). This is @@ -60,26 +53,31 @@ static inline void wr_fence(void) * incoherence). It is therefore ineffective if used after and on the same * thread as a write. */ -static inline void fence(void) +static inline void metag_fence(void) { volatile int *flushptr = (volatile int *) LINSYSEVENT_WR_ATOMIC_UNLOCK; barrier(); *flushptr = 0; barrier(); } -#define smp_mb() fence() -#define smp_rmb() fence() -#define smp_wmb() barrier() +#define __smp_mb() metag_fence() +#define __smp_rmb() metag_fence() +#define __smp_wmb() barrier() #else -#define fence() do { } while (0) -#define smp_mb() barrier() -#define smp_rmb() barrier() -#define smp_wmb() barrier() +#define metag_fence() do { } while (0) +#define __smp_mb() barrier() +#define __smp_rmb() barrier() +#define __smp_wmb() barrier() #endif + +#ifdef CONFIG_SMP +#define fence() metag_fence() +#else +#define fence() do { } while (0) #endif -#define smp_mb__before_atomic() barrier() -#define smp_mb__after_atomic() barrier() +#define __smp_mb__before_atomic() barrier() +#define __smp_mb__after_atomic() barrier() #include <asm-generic/barrier.h> |