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Use "mb" not the nonexistent "rmb" for pg_read_barrier() on Alpha.

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It's only necessary to fix this in 9.4; later versions don't have this
code (because we ripped out Alpha support entirely), while earlier ones
aren't actually using pg_read_barrier() anywhere.

Per rather belated report from Christoph Berg.
This commit is contained in:
Tom Lane
2015-08-29 16:34:30 -04:00
parent 3da9c060fc
commit 747ca66977
1 changed files with 1 additions and 1 deletions
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src/include/storage/barrier.h
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@ -117,7 +117,7 @@ extern slock_t dummy_spinlock;
* read barrier to cover that case. We might need to add that later. * read barrier to cover that case. We might need to add that later.
*/ */
#define pg_memory_barrier() __asm__ __volatile__ ("mb" : : : "memory") #define pg_memory_barrier() __asm__ __volatile__ ("mb" : : : "memory")
#define pg_read_barrier() __asm__ __volatile__ ("rmb" : : : "memory") #define pg_read_barrier() __asm__ __volatile__ ("mb" : : : "memory")
#define pg_write_barrier() __asm__ __volatile__ ("wmb" : : : "memory") #define pg_write_barrier() __asm__ __volatile__ ("wmb" : : : "memory")
#elif defined(__hppa) || defined(__hppa__) /* HP PA-RISC */ #elif defined(__hppa) || defined(__hppa__) /* HP PA-RISC */