diff options
| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2014-01-31 14:20:31 +0100 |
|---|---|---|
| committer | Gary S. Robertson <gary.robertson@linaro.org> | 2014-06-06 15:24:08 -0500 |
| commit | d4e428dba1e1843ba7e43adf7edd6eb02919b98e (patch) | |
| tree | 2d2e40df25e45c86536548391084a01cbbb69913 /arch | |
| parent | 7d12f9a0f1e220c27958fce764ce30fcd4cd17bc (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().
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/kernel/smp.c | 2 | ||||
| -rw-r--r-- | arch/powerpc/kernel/time.c | 2 | ||||
| -rw-r--r-- | arch/sparc/kernel/pcr.c | 2 |
3 files changed, 5 insertions, 1 deletions
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index b7b4c86e338b..7a41b96b4d20 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -454,12 +454,14 @@ void arch_send_call_function_single_ipi(int cpu) } #ifdef CONFIG_IRQ_WORK +#ifndef CONFIG_PREEMPT_RT_FULL void arch_irq_work_raise(void) { if (is_smp()) smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK); } #endif +#endif static const char *ipi_types[NR_IPI] = { #define S(x,s) [x] = s diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index b3dab20acf34..edf0d00a9130 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -423,7 +423,7 @@ unsigned long profile_pc(struct pt_regs *regs) EXPORT_SYMBOL(profile_pc); #endif -#ifdef CONFIG_IRQ_WORK +#if defined(CONFIG_IRQ_WORK) && !defined(CONFIG_PREEMPT_RT_FULL) /* * 64-bit uses a byte in the PACA, 32-bit uses a per-cpu variable... 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); |