From: Thomas Gleixner <tglx@linutronix.de> mainline inclusion from mainline-v5.13-rc3 commit 4d80d6ca5d77fde9880da8466e5b64f250e5bf82 category: bugfix bugzilla: 175148 CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ------------------------------------------------------------------------ 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 <tglx@linutronix.de> Acked-by: Mark Rutland <mark.rutland@arm.com> Link: https://lore.kernel.org/r/20210518093117.968251441@linutronix.de Reviewed-by: Shaokun Zhang <zhangshaokun@hisilicon.com> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> --- include/linux/interrupt.h | 35 ++--------------------------------- kernel/irq/manage.c | 33 ++++++++++++++++++++++++++++++++- 2 files changed, 34 insertions(+), 34 deletions(-) diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h index ee8299eb1f52..087a1cfad35c 100644 --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -314,39 +314,8 @@ struct irq_affinity_desc { extern cpumask_var_t irq_default_affinity; -/* Internal implementation. Use the helpers below */ -extern int __irq_set_affinity(unsigned int irq, const struct cpumask *cpumask, - bool force); - -/** - * 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 - */ -static inline int -irq_set_affinity(unsigned int irq, const struct cpumask *cpumask) -{ - return __irq_set_affinity(irq, cpumask, false); -} - -/** - * 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. - */ -static inline int -irq_force_affinity(unsigned int irq, const struct cpumask *cpumask) -{ - return __irq_set_affinity(irq, cpumask, true); -} +extern int irq_set_affinity(unsigned int irq, const struct cpumask *cpumask); +extern int irq_force_affinity(unsigned int irq, const struct cpumask *cpumask); extern int irq_can_set_affinity(unsigned int irq); extern int irq_select_affinity(unsigned int irq); diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 79dc02b956dc..b2d569f313a1 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -371,7 +371,8 @@ int irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask, 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; @@ -386,6 +387,36 @@ 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; -- 2.20.1