This is a note to let you know that I've just added the patch titled
sh: cmpxchg: fix a bit shift bug in big_endian os
to the 4.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sh-cmpxchg-fix-a-bit-shift-bug-in-big_endian-os.patch
and it can be found in the queue-4.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ff18143ceed3424b7d6cdb8659b9692fa734f0d8 Mon Sep 17 00:00:00 2001
From: Pan Xinhui <xinhui.pan@xxxxxxxxxxxxxxxxxx>
Date: Wed, 20 Apr 2016 14:41:00 +0800
Subject: sh: cmpxchg: fix a bit shift bug in big_endian os
From: Pan Xinhui <xinhui.pan@xxxxxxxxxxxxxxxxxx>
commit ff18143ceed3424b7d6cdb8659b9692fa734f0d8 upstream.
Correct bitoff in big endian OS.
Current code works correctly for 1 byte but not for 2 bytes.
Fixes: 3226aad81aa6 ("sh: support 1 and 2 byte xchg")
Signed-off-by: Pan Xinhui <xinhui.pan@xxxxxxxxxxxxxxxxxx>
Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Signed-off-by: Rich Felker <dalias@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/sh/include/asm/cmpxchg-xchg.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/sh/include/asm/cmpxchg-xchg.h
+++ b/arch/sh/include/asm/cmpxchg-xchg.h
@@ -21,7 +21,7 @@ static inline u32 __xchg_cmpxchg(volatil
int off = (unsigned long)ptr % sizeof(u32);
volatile u32 *p = ptr - off;
#ifdef __BIG_ENDIAN
- int bitoff = (sizeof(u32) - 1 - off) * BITS_PER_BYTE;
+ int bitoff = (sizeof(u32) - size - off) * BITS_PER_BYTE;
#else
int bitoff = off * BITS_PER_BYTE;
#endif
Patches currently in stable-queue which might be from xinhui.pan@xxxxxxxxxxxxxxxxxx are
queue-4.7/sh-cmpxchg-fix-a-bit-shift-bug-in-big_endian-os.patch
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