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[PATCH] Don't use lock section for mutexes and semaphores 

Lock sections cannot be handled by the dwarf2 unwinder.

Disadvantage is a taken branch in the hot path.

Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Andi Kleen 2006-09-26 10:52:32 +02:00 committed by Andi Kleen
parent 7ca2b49b06
commit 8578bdf835
3 changed files with 24 additions and 45 deletions
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20
include/asm-x86_64/mutex.h
View File

@ -25,13 +25,9 @@ do { \
\
__asm__ __volatile__( \
LOCK_PREFIX " decl (%%rdi) \n" \
" js 2f \n" \
"1: \n" \
\
LOCK_SECTION_START("") \
"2: call "#fail_fn" \n" \
" jmp 1b \n" \
LOCK_SECTION_END \
" jns 1f \n" \
" call "#fail_fn" \n" \
"1:" \
\
:"=D" (dummy) \
: "D" (v) \
@ -75,13 +71,9 @@ do { \
\
__asm__ __volatile__( \
LOCK_PREFIX " incl (%%rdi) \n" \
" jle 2f \n" \
"1: \n" \
\
LOCK_SECTION_START("") \
"2: call "#fail_fn" \n" \
" jmp 1b \n" \
LOCK_SECTION_END \
" jg 1f \n" \
" call "#fail_fn" \n" \
"1: " \
\
:"=D" (dummy) \
: "D" (v) \

40
include/asm-x86_64/semaphore.h
View File

@ -107,12 +107,9 @@ static inline void down(struct semaphore * sem)
__asm__ __volatile__(
"# atomic down operation\n\t"
LOCK_PREFIX "decl %0\n\t" /* --sem->count */
"js 2f\n"
"1:\n"
LOCK_SECTION_START("")
"2:\tcall __down_failed\n\t"
"jmp 1b\n"
LOCK_SECTION_END
"jns 1f\n\t"
"call __down_failed\n"
"1:"
:"=m" (sem->count)
:"D" (sem)
:"memory");
@ -130,14 +127,11 @@ static inline int down_interruptible(struct semaphore * sem)
__asm__ __volatile__(
"# atomic interruptible down operation\n\t"
"xorl %0,%0\n\t"
LOCK_PREFIX "decl %1\n\t" /* --sem->count */
"js 2f\n\t"
"xorl %0,%0\n"
"1:\n"
LOCK_SECTION_START("")
"2:\tcall __down_failed_interruptible\n\t"
"jmp 1b\n"
LOCK_SECTION_END
"jns 2f\n\t"
"call __down_failed_interruptible\n"
"2:\n"
:"=a" (result), "=m" (sem->count)
:"D" (sem)
:"memory");
@ -154,14 +148,11 @@ static inline int down_trylock(struct semaphore * sem)
__asm__ __volatile__(
"# atomic interruptible down operation\n\t"
"xorl %0,%0\n\t"
LOCK_PREFIX "decl %1\n\t" /* --sem->count */
"js 2f\n\t"
"xorl %0,%0\n"
"1:\n"
LOCK_SECTION_START("")
"2:\tcall __down_failed_trylock\n\t"
"jmp 1b\n"
LOCK_SECTION_END
"jns 2f\n\t"
"call __down_failed_trylock\n\t"
"2:\n"
:"=a" (result), "=m" (sem->count)
:"D" (sem)
:"memory","cc");
@ -179,12 +170,9 @@ static inline void up(struct semaphore * sem)
__asm__ __volatile__(
"# atomic up operation\n\t"
LOCK_PREFIX "incl %0\n\t" /* ++sem->count */
"jle 2f\n"
"1:\n"
LOCK_SECTION_START("")
"2:\tcall __up_wakeup\n\t"
"jmp 1b\n"
LOCK_SECTION_END
"jg 1f\n\t"
"call __up_wakeup\n"
"1:"
:"=m" (sem->count)
:"D" (sem)
:"memory");

9
include/asm-x86_64/spinlock.h
View File

@ -22,14 +22,13 @@
#define __raw_spin_lock_string \
"\n1:\t" \
LOCK_PREFIX " ; decl %0\n\t" \
"js 2f\n" \
LOCK_SECTION_START("") \
"2:\t" \
"jns 2f\n" \
"3:\n" \
"rep;nop\n\t" \
"cmpl $0,%0\n\t" \
"jle 2b\n\t" \
"jle 3b\n\t" \
"jmp 1b\n" \
LOCK_SECTION_END
"2:\t" \
#define __raw_spin_lock_string_up \
"\n\tdecl %0"