diff options
| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2014-01-31 14:20:31 +0100 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2014-02-28 22:46:28 -0500 |
| commit | a8003018aee9e12db7004cec0cdfd6577178d8f7 (patch) | |
| tree | a67b13b86518624724e3ab314a12c06b16ad7074 /arch/sparc | |
| parent | 3e2e2055e5cd3d9e729c8520ffc07cebbc41cbc4 (diff) | |
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().
Cc: stable-rt@vger.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'arch/sparc')
| -rw-r--r-- | arch/sparc/kernel/pcr.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/sparc/kernel/pcr.c b/arch/sparc/kernel/pcr.c index 269af58497aa..dbb51a6441a6 100644 --- a/arch/sparc/kernel/pcr.c +++ b/arch/sparc/kernel/pcr.c @@ -43,10 +43,12 @@ void __irq_entry deferred_pcr_work_irq(int irq, struct pt_regs *regs) set_irq_regs(old_regs); } +#ifndef CONFIG_PREEMPT_RT_FULL void arch_irq_work_raise(void) { set_softint(1 << PIL_DEFERRED_PCR_WORK); } +#endif const struct pcr_ops *pcr_ops; EXPORT_SYMBOL_GPL(pcr_ops); |