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[PATCH] fix i386 mutex fastpath on FRAME_POINTER && !DEBUG_MUTEXES

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Call the mutex slowpath more conservatively - e.g.  FRAME_POINTERS can
change the calling convention, in which case a direct branch to the
slowpath becomes illegal.  Bug found by Hugh Dickins.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar
2006-01-10 22:07:44 +01:00
committed by Linus Torvalds
parent 042c904c3e
commit 73165b88ff
2 changed files with 14 additions and 11 deletions
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16
include/asm-i386/mutex.h
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@@ -28,7 +28,13 @@ do { \
\
__asm__ __volatile__( \
LOCK " decl (%%eax) \n" \
" js "#fail_fn" \n" \
" js 2f \n" \
"1: \n" \
\
LOCK_SECTION_START("") \
"2: call "#fail_fn" \n" \
" jmp 1b \n" \
LOCK_SECTION_END \
\
:"=a" (dummy) \
: "a" (count) \
@@ -78,7 +84,13 @@ do { \
\
__asm__ __volatile__( \
LOCK " incl (%%eax) \n" \
" jle "#fail_fn" \n" \
" jle 2f \n" \
"1: \n" \
\
LOCK_SECTION_START("") \
"2: call "#fail_fn" \n" \
" jmp 1b \n" \
LOCK_SECTION_END \
\
:"=a" (dummy) \
: "a" (count) \