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timers: Clear pending_map on CPU hotplug

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CPU hotplug migration leaves pending_map bits set on the outgoing CPU
while its wheel vectors are empty. After re-online, a later next_expiry
recalc can treat those empty buckets as pending and temporarily pull
next_expiry forward until collect drains the bits.

Clear pending_map under the base lock after migration in timers_dead_cpu().

Fixes: 500462a9de ("timers: Switch to a non-cascading wheel")
Signed-off-by: Liang Hao <haohlliang@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260930063621.37740-1-haohlliang@gmail.com
This commit is contained in:
Liang Hao 2026-09-30 14:36:21 +08:00 committed by Thomas Gleixner
parent c03c1a1450
commit e7cad586d7
1 changed files with 2 additions and 0 deletions
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2
kernel/time/timer.c
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@ -44,6 +44,7 @@
#include <linux/compat.h>
#include <linux/random.h>
#include <linux/sysctl.h>
#include <linux/bitmap.h>
#include <linux/uaccess.h>
#include <asm/unistd.h>
@ -2541,6 +2542,7 @@ int timers_dead_cpu(unsigned int cpu)
for (i = 0; i < WHEEL_SIZE; i++)
migrate_timer_list(new_base, old_base->vectors + i);
bitmap_zero(old_base->pending_map, WHEEL_SIZE);
raw_spin_unlock(&old_base->lock);
raw_spin_unlock_irq(&new_base->lock);
put_cpu_ptr(&timer_bases);