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hrtimer: fix rq->lock inversion (again)

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It appears I inadvertly introduced rq->lock recursion to the
hrtimer_start() path when I delegated running already expired
timers to softirq context.

This patch fixes it by introducing a __hrtimer_start_range_ns()
method that will not use raise_softirq_irqoff() but
__raise_softirq_irqoff() which avoids the wakeup.

It then also changes schedule() to check for pending softirqs and
do the wakeup then, I'm not quite sure I like this last bit, nor
am I convinced its really needed.

Signed-off-by: Peter Zijlstra <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: [email protected]
LKML-Reference: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Peter Zijlstra 2009-03-13 12:21:27 +01:00 • committed by Ingo Molnar
commit 7f1e2ca9f0
5 changed files with 52 additions and 25 deletions
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2
kernel/softirq.c
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@ -58,7 +58,7 @@ static DEFINE_PER_CPU(struct task_struct *, ksoftirqd);
* to the pending events, so lets the scheduler to balance
* the softirq load for us.
*/
static inline void wakeup_softirqd(void)
void wakeup_softirqd(void)
{
/* Interrupts are disabled: no need to stop preemption */
struct task_struct *tsk = __get_cpu_var(ksoftirqd);