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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2014-01-31 13:20:31 (GMT) |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2014-04-10 00:19:49 (GMT) |
| commit | 4693b2db3dc1a48d4959e512f334c1772775440b (patch) | |
| tree | e5c28534891fff83007ee2848abef57c4c9e2cda /kernel/time | |
| parent | 8c57bf0162a60e73faf923f89db7b8f2b4723b2b (diff) | |
| download | linux-fsl-qoriq-4693b2db3dc1a48d4959e512f334c1772775440b.tar.xz | |
irq_work: allow certain work in hard irq context
irq_work is processed in softirq context on -RT because we want to avoid
long latencies which might arise from processing lots of perf events.
The noHZ-full mode requires its callback to be called from real hardirq
context (commit 76c24fb ("nohz: New APIs to re-evaluate the tick on full
dynticks CPUs")). If it is called from a thread context we might get
wrong results for checks like "is_idle_task(current)".
This patch introduces a second list (hirq_work_list) which will be used
if irq_work_run() has been invoked from hardirq context and process only
work items marked with IRQ_WORK_HARD_IRQ.
This patch also removes arch_irq_work_raise() from sparc & powerpc like
it is already done for x86. Atleast for powerpc it is somehow
superfluous because it is called from the timer interrupt which should
invoke update_process_times().
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/tick-sched.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 1f4299b..3740f28 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -221,6 +221,7 @@ static void nohz_full_kick_work_func(struct irq_work *work) static DEFINE_PER_CPU(struct irq_work, nohz_full_kick_work) = { .func = nohz_full_kick_work_func, + .flags = IRQ_WORK_HARD_IRQ, }; /* |