From 4d80d6ca5d77fde9880da8466e5b64f250e5bf82 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Tue, 18 May 2021 11:17:26 +0200 Subject: genirq: Export affinity setter for modules Perf modules abuse irq_set_affinity_hint() to set the affinity of system PMU interrupts just because irq_set_affinity() was not exported. The fact that irq_set_affinity_hint() actually sets the affinity is a non-documented side effect and the name is clearly saying it's a hint. To clean this up, export the real affinity setter. Signed-off-by: Thomas Gleixner Acked-by: Mark Rutland Link: https://lore.kernel.org/r/20210518093117.968251441@linutronix.de --- kernel/irq/manage.c | 33 ++++++++++++++++++++++++++++++++- 1 file changed, 32 insertions(+), 1 deletion(-) (limited to 'kernel/irq') diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 4c14356543d9..a847dd2044c8 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -441,7 +441,8 @@ out_unlock: return ret; } -int __irq_set_affinity(unsigned int irq, const struct cpumask *mask, bool force) +static int __irq_set_affinity(unsigned int irq, const struct cpumask *mask, + bool force) { struct irq_desc *desc = irq_to_desc(irq); unsigned long flags; @@ -456,6 +457,36 @@ int __irq_set_affinity(unsigned int irq, const struct cpumask *mask, bool force) return ret; } +/** + * irq_set_affinity - Set the irq affinity of a given irq + * @irq: Interrupt to set affinity + * @cpumask: cpumask + * + * Fails if cpumask does not contain an online CPU + */ +int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask) +{ + return __irq_set_affinity(irq, cpumask, false); +} +EXPORT_SYMBOL_GPL(irq_set_affinity); + +/** + * irq_force_affinity - Force the irq affinity of a given irq + * @irq: Interrupt to set affinity + * @cpumask: cpumask + * + * Same as irq_set_affinity, but without checking the mask against + * online cpus. + * + * Solely for low level cpu hotplug code, where we need to make per + * cpu interrupts affine before the cpu becomes online. + */ +int irq_force_affinity(unsigned int irq, const struct cpumask *cpumask) +{ + return __irq_set_affinity(irq, cpumask, true); +} +EXPORT_SYMBOL_GPL(irq_force_affinity); + int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m) { unsigned long flags; -- cgit v1.2.3