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[PATCH] m32r: __cmpxchg_u32 fix

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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>
This commit is contained in:
Hirokazu Takata 2006-02-20 18:28:15 -08:00 committed by Linus Torvalds
parent 49d9c81a69
commit b04ec261bd
1 changed files with 1 additions and 1 deletions
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2
include/asm-m32r/system.h
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@ -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)