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| author | Hirokazu Takata <takata@linux-m32r.org> | 2006-02-20 18:28:15 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-20 20:00:12 -0800 |
| commit | b04ec261bd64f927bf3fce5cf9eeb0225557939d (patch) | |
| tree | 2ad7a66b6f0dc6e0e641bef088865c5c140d0ae1 /include/asm-m32r | |
| parent | 49d9c81a699b57a5b6488f3a761669d05e116588 (diff) | |
| download | lwn-b04ec261bd64f927bf3fce5cf9eeb0225557939d.tar.gz lwn-b04ec261bd64f927bf3fce5cf9eeb0225557939d.zip | |
[PATCH] m32r: __cmpxchg_u32 fix
This patch fixes a bug of include/asm-m32r/system.h:__cmpxchg_u32().
static __inline__ unsigned long
__cmpxchg_u32(volatile unsigned int *p, unsigned int old, unsigned int new);
In __cmpxchg_u32(), the "old" value must not be changed to the previous "*p"
value. But the former code modifies the previous "*p" value.
A deadlock at _atomic_dec_and_lock sometimes happened due to this bug.
Signed-off-by: Hayato Fujiwara <fujiwara@linux-m32r.org>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-m32r')
| -rw-r--r-- | include/asm-m32r/system.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/asm-m32r/system.h b/include/asm-m32r/system.h index 06c12a037cba..d6a2c613be68 100644 --- a/include/asm-m32r/system.h +++ b/include/asm-m32r/system.h @@ -239,7 +239,7 @@ __cmpxchg_u32(volatile unsigned int *p, unsigned int old, unsigned int new) " bra 2f; \n" " .fillinsn \n" "1:" - M32R_UNLOCK" %2, @%1; \n" + M32R_UNLOCK" %0, @%1; \n" " .fillinsn \n" "2:" : "=&r" (retval) |