From: "Michael S. Tsirkin" <mst@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: linux-arch@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
linux-sh@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
virtualization@lists.linux-foundation.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>
Subject: [PATCH] sh: fix smp_store_mb for !SMP
Date: Thu, 21 Jan 2016 10:29:22 +0000 [thread overview]
Message-ID: <1453371795-32669-1-git-send-email-mst@redhat.com> (raw)
sh variant of smp_store_mb() calls xchg() on !SMP which is stronger than
implied by both the name and the documentation.
commit 90a3ccb0be538a914e6a5c51ae919762261563ad ("sh: define __smp_xxx,
fix smp_store_mb for !SMP") was supposed to fix it but
left the bug in place.
Drop smp_store_mb, so that code in asm-generic/barrier.h
will define it correctly depending on CONFIG_SMP.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
I put this in my tree as that's where the original commit
came through, but if anyone else prefers to merge it, pls
let me know.
arch/sh/include/asm/barrier.h | 1 -
1 file changed, 1 deletion(-)
diff --git a/arch/sh/include/asm/barrier.h b/arch/sh/include/asm/barrier.h
index f887c64..8a84e05 100644
--- a/arch/sh/include/asm/barrier.h
+++ b/arch/sh/include/asm/barrier.h
@@ -33,7 +33,6 @@
#endif
#define __smp_store_mb(var, value) do { (void)xchg(&var, value); } while (0)
-#define smp_store_mb(var, value) __smp_store_mb(var, value)
#include <asm-generic/barrier.h>
--
MST
reply other threads:[~2016-01-21 10:29 UTC|newest]
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