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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2008-01-25 21:08:32 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-25 21:08:32 +0100
commit37bb6cb4097e29ffee970065b74499cbf10603a3 (patch)
tree406de8e53a02244d9f8998bf5e583d3923b4e5c0 /kernel
parenthrtimer: fixup the HRTIMER_CB_IRQSAFE_NO_SOFTIRQ fallback (diff)
downloadlinux-dev-37bb6cb4097e29ffee970065b74499cbf10603a3.tar.xz
linux-dev-37bb6cb4097e29ffee970065b74499cbf10603a3.zip
hrtimer: unlock hrtimer_wakeup
hrtimer_wakeup creates a base->lock rq->lock lock dependancy. Avoid this by switching to HRTIMER_CB_IRQSAFE_NO_SOFTIRQ which doesn't hold base->lock. This fully untangles hrtimer locks from the scheduler locks, and allows hrtimer usage in the scheduler proper. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/hrtimer.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 061ae28a36a0..bd5d6b5060bc 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1293,7 +1293,7 @@ void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, struct task_struct *task)
sl->timer.function = hrtimer_wakeup;
sl->task = task;
#ifdef CONFIG_HIGH_RES_TIMERS
- sl->timer.cb_mode = HRTIMER_CB_IRQSAFE_NO_RESTART;
+ sl->timer.cb_mode = HRTIMER_CB_IRQSAFE_NO_SOFTIRQ;
#endif
}
@@ -1304,6 +1304,8 @@ static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mod
do {
set_current_state(TASK_INTERRUPTIBLE);
hrtimer_start(&t->timer, t->timer.expires, mode);
+ if (!hrtimer_active(&t->timer))
+ t->task = NULL;
if (likely(t->task))
schedule();