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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2014-01-31 13:20:31 (GMT) |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2015-02-13 22:20:57 (GMT) |
| commit | 66ac3feebc0fa881fc4b9d03110bd257536852e7 (patch) | |
| tree | 59f131743c457e418f24975692ed06817407231d /kernel/timer.c | |
| parent | ef6bcccdb8ae11d181029a5e2a866140fdc4f1ce (diff) | |
| download | linux-fsl-qoriq-66ac3feebc0fa881fc4b9d03110bd257536852e7.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/timer.c')
| -rw-r--r-- | kernel/timer.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/timer.c b/kernel/timer.c index a85ac8f..611a597 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -1425,7 +1425,7 @@ void update_process_times(int user_tick) scheduler_tick(); run_local_timers(); rcu_check_callbacks(cpu, user_tick); -#if defined(CONFIG_IRQ_WORK) && !defined(CONFIG_PREEMPT_RT_FULL) +#if defined(CONFIG_IRQ_WORK) if (in_irq()) irq_work_run(); #endif |