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authorIngo Molnar <mingo@elte.hu>2006-01-10 22:07:44 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-10 13:20:47 -0800
commit73165b88ffd29813bf73b331eaf90d3521443236 (patch)
tree224b510df182c5cba7b64fea6202ed9dd414835e /include/asm-i386/mutex.h
parent042c904c3e35e95ac911e8a2bf4097099b059e1a (diff)
downloadblackbird-op-linux-73165b88ffd29813bf73b331eaf90d3521443236.tar.gz
blackbird-op-linux-73165b88ffd29813bf73b331eaf90d3521443236.zip
[PATCH] fix i386 mutex fastpath on FRAME_POINTER && !DEBUG_MUTEXES
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>
Diffstat (limited to 'include/asm-i386/mutex.h')
-rw-r--r--include/asm-i386/mutex.h16
1 files changed, 14 insertions, 2 deletions
diff --git a/include/asm-i386/mutex.h b/include/asm-i386/mutex.h
index 4e5e3de1b9a6..c657d4b09f0a 100644
--- a/include/asm-i386/mutex.h
+++ b/include/asm-i386/mutex.h
@@ -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) \
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