From 747ca66977d5539a5ab9e5f33d3ca074fc3fd19b Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Sat, 29 Aug 2015 16:34:30 -0400
Subject: [PATCH] Use "mb" not the nonexistent "rmb" for pg_read_barrier() on
Alpha.
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.
---
src/include/storage/barrier.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/include/storage/barrier.h b/src/include/storage/barrier.h
index 2bef2eb6ad9..94169bd7460 100644
--- a/src/include/storage/barrier.h
+++ b/src/include/storage/barrier.h
@@ -117,7 +117,7 @@ extern slock_t dummy_spinlock;
* read barrier to cover that case. We might need to add that later.
*/
#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")
#elif defined(__hppa) || defined(__hppa__) /* HP PA-RISC */
--
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