summaryrefslogtreecommitdiffstats
path: root/include/linux/wait.h
diff options
context:
space:
mode:
authorPeter Zijlstra <peterz@infradead.org>2013-10-02 11:22:33 +0200
committerIngo Molnar <mingo@kernel.org>2013-10-04 10:16:25 +0200
commit35a2af94c7ce7130ca292c68b1d27fcfdb648f6b (patch)
tree10b28670fb387984751de104913db9408ade8741 /include/linux/wait.h
parentebdc195f2ec68576876216081035293e37318e86 (diff)
downloadop-kernel-dev-35a2af94c7ce7130ca292c68b1d27fcfdb648f6b.zip
op-kernel-dev-35a2af94c7ce7130ca292c68b1d27fcfdb648f6b.tar.gz
sched/wait: Make the __wait_event*() interface more friendly
Change all __wait_event*() implementations to match the corresponding wait_event*() signature for convenience. In particular this does away with the weird 'ret' logic. Since there are __wait_event*() users this requires we update them too. Reviewed-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20131002092529.042563462@infradead.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/wait.h')
-rw-r--r--include/linux/wait.h113
1 files changed, 55 insertions, 58 deletions
diff --git a/include/linux/wait.h b/include/linux/wait.h
index c065e8a..bd4bd7b 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -179,24 +179,23 @@ wait_queue_head_t *bit_waitqueue(void *, int);
#define wake_up_interruptible_sync_poll(x, m) \
__wake_up_sync_key((x), TASK_INTERRUPTIBLE, 1, (void *) (m))
-#define ___wait_cond_timeout(condition, ret) \
+#define ___wait_cond_timeout(condition) \
({ \
bool __cond = (condition); \
- if (__cond && !ret) \
- ret = 1; \
- __cond || !ret; \
+ if (__cond && !__ret) \
+ __ret = 1; \
+ __cond || !__ret; \
})
#define ___wait_signal_pending(state) \
((state == TASK_INTERRUPTIBLE && signal_pending(current)) || \
(state == TASK_KILLABLE && fatal_signal_pending(current)))
-#define ___wait_nop_ret int ret __always_unused
-
#define ___wait_event(wq, condition, state, exclusive, ret, cmd) \
-do { \
+({ \
__label__ __out; \
DEFINE_WAIT(__wait); \
+ long __ret = ret; \
\
for (;;) { \
if (exclusive) \
@@ -208,7 +207,7 @@ do { \
break; \
\
if (___wait_signal_pending(state)) { \
- ret = -ERESTARTSYS; \
+ __ret = -ERESTARTSYS; \
if (exclusive) { \
abort_exclusive_wait(&wq, &__wait, \
state, NULL); \
@@ -220,12 +219,12 @@ do { \
cmd; \
} \
finish_wait(&wq, &__wait); \
-__out: ; \
-} while (0)
+__out: __ret; \
+})
#define __wait_event(wq, condition) \
- ___wait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0, \
- ___wait_nop_ret, schedule())
+ (void)___wait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0, 0, \
+ schedule())
/**
* wait_event - sleep until a condition gets true
@@ -246,10 +245,10 @@ do { \
__wait_event(wq, condition); \
} while (0)
-#define __wait_event_timeout(wq, condition, ret) \
- ___wait_event(wq, ___wait_cond_timeout(condition, ret), \
- TASK_UNINTERRUPTIBLE, 0, ret, \
- ret = schedule_timeout(ret))
+#define __wait_event_timeout(wq, condition, timeout) \
+ ___wait_event(wq, ___wait_cond_timeout(condition), \
+ TASK_UNINTERRUPTIBLE, 0, timeout, \
+ __ret = schedule_timeout(__ret))
/**
* wait_event_timeout - sleep until a condition gets true or a timeout elapses
@@ -272,12 +271,12 @@ do { \
({ \
long __ret = timeout; \
if (!(condition)) \
- __wait_event_timeout(wq, condition, __ret); \
+ __ret = __wait_event_timeout(wq, condition, timeout); \
__ret; \
})
-#define __wait_event_interruptible(wq, condition, ret) \
- ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, ret, \
+#define __wait_event_interruptible(wq, condition) \
+ ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \
schedule())
/**
@@ -299,14 +298,14 @@ do { \
({ \
int __ret = 0; \
if (!(condition)) \
- __wait_event_interruptible(wq, condition, __ret); \
+ __ret = __wait_event_interruptible(wq, condition); \
__ret; \
})
-#define __wait_event_interruptible_timeout(wq, condition, ret) \
- ___wait_event(wq, ___wait_cond_timeout(condition, ret), \
- TASK_INTERRUPTIBLE, 0, ret, \
- ret = schedule_timeout(ret))
+#define __wait_event_interruptible_timeout(wq, condition, timeout) \
+ ___wait_event(wq, ___wait_cond_timeout(condition), \
+ TASK_INTERRUPTIBLE, 0, timeout, \
+ __ret = schedule_timeout(__ret))
/**
* wait_event_interruptible_timeout - sleep until a condition gets true or a timeout elapses
@@ -330,7 +329,8 @@ do { \
({ \
long __ret = timeout; \
if (!(condition)) \
- __wait_event_interruptible_timeout(wq, condition, __ret); \
+ __ret = __wait_event_interruptible_timeout(wq, \
+ condition, timeout); \
__ret; \
})
@@ -347,7 +347,7 @@ do { \
current->timer_slack_ns, \
HRTIMER_MODE_REL); \
\
- ___wait_event(wq, condition, state, 0, __ret, \
+ __ret = ___wait_event(wq, condition, state, 0, 0, \
if (!__t.task) { \
__ret = -ETIME; \
break; \
@@ -409,15 +409,15 @@ do { \
__ret; \
})
-#define __wait_event_interruptible_exclusive(wq, condition, ret) \
- ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 1, ret, \
+#define __wait_event_interruptible_exclusive(wq, condition) \
+ ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 1, 0, \
schedule())
#define wait_event_interruptible_exclusive(wq, condition) \
({ \
int __ret = 0; \
if (!(condition)) \
- __wait_event_interruptible_exclusive(wq, condition, __ret);\
+ __ret = __wait_event_interruptible_exclusive(wq, condition);\
__ret; \
})
@@ -570,8 +570,8 @@ do { \
-#define __wait_event_killable(wq, condition, ret) \
- ___wait_event(wq, condition, TASK_KILLABLE, 0, ret, schedule())
+#define __wait_event_killable(wq, condition) \
+ ___wait_event(wq, condition, TASK_KILLABLE, 0, 0, schedule())
/**
* wait_event_killable - sleep until a condition gets true
@@ -592,18 +592,17 @@ do { \
({ \
int __ret = 0; \
if (!(condition)) \
- __wait_event_killable(wq, condition, __ret); \
+ __ret = __wait_event_killable(wq, condition); \
__ret; \
})
#define __wait_event_lock_irq(wq, condition, lock, cmd) \
- ___wait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0, \
- ___wait_nop_ret, \
- spin_unlock_irq(&lock); \
- cmd; \
- schedule(); \
- spin_lock_irq(&lock))
+ (void)___wait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0, 0, \
+ spin_unlock_irq(&lock); \
+ cmd; \
+ schedule(); \
+ spin_lock_irq(&lock))
/**
* wait_event_lock_irq_cmd - sleep until a condition gets true. The
@@ -663,11 +662,11 @@ do { \
} while (0)
-#define __wait_event_interruptible_lock_irq(wq, condition, lock, ret, cmd) \
- ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, ret, \
- spin_unlock_irq(&lock); \
- cmd; \
- schedule(); \
+#define __wait_event_interruptible_lock_irq(wq, condition, lock, cmd) \
+ ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \
+ spin_unlock_irq(&lock); \
+ cmd; \
+ schedule(); \
spin_lock_irq(&lock))
/**
@@ -698,10 +697,9 @@ do { \
#define wait_event_interruptible_lock_irq_cmd(wq, condition, lock, cmd) \
({ \
int __ret = 0; \
- \
if (!(condition)) \
- __wait_event_interruptible_lock_irq(wq, condition, \
- lock, __ret, cmd); \
+ __ret = __wait_event_interruptible_lock_irq(wq, \
+ condition, lock, cmd); \
__ret; \
})
@@ -730,18 +728,18 @@ do { \
#define wait_event_interruptible_lock_irq(wq, condition, lock) \
({ \
int __ret = 0; \
- \
if (!(condition)) \
- __wait_event_interruptible_lock_irq(wq, condition, \
- lock, __ret, ); \
+ __ret = __wait_event_interruptible_lock_irq(wq, \
+ condition, lock,) \
__ret; \
})
-#define __wait_event_interruptible_lock_irq_timeout(wq, condition, lock, ret) \
- ___wait_event(wq, ___wait_cond_timeout(condition, ret), \
- TASK_INTERRUPTIBLE, 0, ret, \
- spin_unlock_irq(&lock); \
- ret = schedule_timeout(ret); \
+#define __wait_event_interruptible_lock_irq_timeout(wq, condition, \
+ lock, timeout) \
+ ___wait_event(wq, ___wait_cond_timeout(condition), \
+ TASK_INTERRUPTIBLE, 0, ret, \
+ spin_unlock_irq(&lock); \
+ __ret = schedule_timeout(__ret); \
spin_lock_irq(&lock));
/**
@@ -771,11 +769,10 @@ do { \
#define wait_event_interruptible_lock_irq_timeout(wq, condition, lock, \
timeout) \
({ \
- int __ret = timeout; \
- \
+ long __ret = timeout; \
if (!(condition)) \
- __wait_event_interruptible_lock_irq_timeout( \
- wq, condition, lock, __ret); \
+ __ret = __wait_event_interruptible_lock_irq_timeout( \
+ wq, condition, lock, timeout); \
__ret; \
})
OpenPOWER on IntegriCloud