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Fix a spurious kernel warning during CPU hotplug events that

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may trigger when timer/hrtimer softirqs are pending, which
 are otherwise hotplug-safe and don't merit a warning.
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'timers-urgent-2023-10-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull timer fix from Ingo Molnar:
 "Fix a spurious kernel warning during CPU hotplug events that may
  trigger when timer/hrtimer softirqs are pending, which are otherwise
  hotplug-safe and don't merit a warning"

* tag 'timers-urgent-2023-10-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  timers: Tag (hr)timer softirq as hotplug safe
This commit is contained in:
Linus Torvalds 2023-10-01 09:41:58 -07:00
commit 373ceff28e
1 changed files with 5 additions and 1 deletions
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6
include/linux/interrupt.h
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@ -569,8 +569,12 @@ enum
* 2) rcu_report_dead() reports the final quiescent states.
*
* _ IRQ_POLL: irq_poll_cpu_dead() migrates the queue
*
* _ (HR)TIMER_SOFTIRQ: (hr)timers_dead_cpu() migrates the queue
*/
#define SOFTIRQ_HOTPLUG_SAFE_MASK (BIT(RCU_SOFTIRQ) | BIT(IRQ_POLL_SOFTIRQ))
#define SOFTIRQ_HOTPLUG_SAFE_MASK (BIT(TIMER_SOFTIRQ) | BIT(IRQ_POLL_SOFTIRQ) |\
BIT(HRTIMER_SOFTIRQ) | BIT(RCU_SOFTIRQ))
/* map softirq index to softirq name. update 'softirq_to_name' in
* kernel/softirq.c when adding a new softirq.