[PATCH] BUILD_LOCK_OPS: cleanup preempt_disable() usage
This patch changes the code from:
preempt_disable();
for (;;) {
...
preempt_disable();
}
to:
for (;;) {
preempt_disable();
...
}
which seems more clean to me and saves a couple of bytes for
each function.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/kernel/spinlock.c b/kernel/spinlock.c
index 0375fcd..d1b8107 100644
--- a/kernel/spinlock.c
+++ b/kernel/spinlock.c
@@ -179,16 +179,16 @@
#define BUILD_LOCK_OPS(op, locktype) \
void __lockfunc _##op##_lock(locktype##_t *lock) \
{ \
- preempt_disable(); \
for (;;) { \
+ preempt_disable(); \
if (likely(_raw_##op##_trylock(lock))) \
break; \
preempt_enable(); \
+ \
if (!(lock)->break_lock) \
(lock)->break_lock = 1; \
while (!op##_can_lock(lock) && (lock)->break_lock) \
cpu_relax(); \
- preempt_disable(); \
} \
(lock)->break_lock = 0; \
} \
@@ -199,19 +199,18 @@
{ \
unsigned long flags; \
\
- preempt_disable(); \
for (;;) { \
+ preempt_disable(); \
local_irq_save(flags); \
if (likely(_raw_##op##_trylock(lock))) \
break; \
local_irq_restore(flags); \
- \
preempt_enable(); \
+ \
if (!(lock)->break_lock) \
(lock)->break_lock = 1; \
while (!op##_can_lock(lock) && (lock)->break_lock) \
cpu_relax(); \
- preempt_disable(); \
} \
(lock)->break_lock = 0; \
return flags; \