From: Pan Xinhui <xinhui@linux.vnet.ibm.com> To: linux-kernel@vger.kernel.org Cc: ysato@users.sourceforge.jp, dalias@libc.org, mst@redhat.com, peterz@infradead.org, linux-sh@vger.kernel.org Subject: [PATCH V2]sh: cmpxchg: fix a bit shift bug in big_endian os Date: Wed, 20 Apr 2016 06:41:00 +0000 [thread overview] Message-ID: <5717247C.7080002@linux.vnet.ibm.com> (raw) In-Reply-To: <5715D72D.7060501@linux.vnet.ibm.com> From: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> 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@linux.vnet.ibm.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> --- changes from V1: just add some patch comments. no code changes. --- arch/sh/include/asm/cmpxchg-xchg.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/sh/include/asm/cmpxchg-xchg.h b/arch/sh/include/asm/cmpxchg-xchg.h index 7219719..1e881f5 100644 --- 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(volatile void *ptr, u32 x, int size) 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 -- 1.9.1
WARNING: multiple messages have this Message-ID (diff)
From: Pan Xinhui <xinhui@linux.vnet.ibm.com> To: linux-kernel@vger.kernel.org Cc: ysato@users.sourceforge.jp, dalias@libc.org, mst@redhat.com, peterz@infradead.org, linux-sh@vger.kernel.org Subject: [PATCH V2]sh: cmpxchg: fix a bit shift bug in big_endian os Date: Wed, 20 Apr 2016 14:41:00 +0800 [thread overview] Message-ID: <5717247C.7080002@linux.vnet.ibm.com> (raw) In-Reply-To: <5715D72D.7060501@linux.vnet.ibm.com> From: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> 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@linux.vnet.ibm.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> --- changes from V1: just add some patch comments. no code changes. --- arch/sh/include/asm/cmpxchg-xchg.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/sh/include/asm/cmpxchg-xchg.h b/arch/sh/include/asm/cmpxchg-xchg.h index 7219719..1e881f5 100644 --- 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(volatile void *ptr, u32 x, int size) 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 -- 1.9.1
next prev parent reply other threads:[~2016-04-20 6:41 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-04-19 6:58 [PATCH] sh: cmpxchg: fix a bit shift bug in big_endian os Pan Xinhui 2016-04-19 6:58 ` Pan Xinhui 2016-04-19 10:00 ` Michael S. Tsirkin 2016-04-19 10:00 ` Michael S. Tsirkin 2016-04-20 6:41 ` Pan Xinhui [this message] 2016-04-20 6:41 ` [PATCH V2]sh: " Pan Xinhui 2016-04-26 1:39 ` Rich Felker 2016-04-26 1:39 ` Rich Felker 2016-04-26 10:07 ` Pan Xinhui 2016-04-26 10:07 ` Pan Xinhui
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