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authorAndi Kleen <ak@suse.de>2006-08-30 19:37:13 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2006-08-30 16:05:15 -0700
commit841be8ddf92578e5b481ed9f9abb85649fc13238 (patch)
tree55d2d25350eb15b6822d91b38a7cddd9c697b58f /include/asm-x86_64/spinlock.h
parentceee88223047749ad683d397b19904c3dfb6adeb (diff)
[PATCH] x86_64: Remove alternative_smp
The .fill causes miscompilations with some binutils version. Instead just patch the lock prefix in the lock constructs. That is the majority of the cost and should be good enough. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64/spinlock.h')
-rw-r--r--include/asm-x86_64/spinlock.h11
1 files changed, 4 insertions, 7 deletions
diff --git a/include/asm-x86_64/spinlock.h b/include/asm-x86_64/spinlock.h
index 8d3421996f9..248a79f0eaf 100644
--- a/include/asm-x86_64/spinlock.h
+++ b/include/asm-x86_64/spinlock.h
@@ -21,7 +21,7 @@
#define __raw_spin_lock_string \
"\n1:\t" \
- "lock ; decl %0\n\t" \
+ LOCK_PREFIX " ; decl %0\n\t" \
"js 2f\n" \
LOCK_SECTION_START("") \
"2:\t" \
@@ -40,10 +40,7 @@
static inline void __raw_spin_lock(raw_spinlock_t *lock)
{
- alternative_smp(
- __raw_spin_lock_string,
- __raw_spin_lock_string_up,
- "=m" (lock->slock) : : "memory");
+ asm volatile(__raw_spin_lock_string : "=m" (lock->slock) : : "memory");
}
#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
@@ -125,12 +122,12 @@ static inline int __raw_write_trylock(raw_rwlock_t *lock)
static inline void __raw_read_unlock(raw_rwlock_t *rw)
{
- asm volatile("lock ; incl %0" :"=m" (rw->lock) : : "memory");
+ asm volatile(LOCK_PREFIX " ; incl %0" :"=m" (rw->lock) : : "memory");
}
static inline void __raw_write_unlock(raw_rwlock_t *rw)
{
- asm volatile("lock ; addl $" RW_LOCK_BIAS_STR ",%0"
+ asm volatile(LOCK_PREFIX " ; addl $" RW_LOCK_BIAS_STR ",%0"
: "=m" (rw->lock) : : "memory");
}