diff options
| author | Liang Hao <haohlliang@gmail.com> | 2026-09-30 14:36:21 +0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@kernel.org> | 2026-10-20 15:28:14 +0200 |
| commit | e7cad586d73276cbd4466de81b2092287d7475c0 (patch) | |
| tree | 71b045e73844ee3266f0f3361853a03c9fbc9c42 /kernel | |
| parent | c03c1a14507dfaf8b856c2608f9ac216021fc222 (diff) | |
timers: Clear pending_map on CPU hotplug
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: 500462a9de65 ("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
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/time/timer.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/time/timer.c b/kernel/time/timer.c index ae9abf14688e..fc374444acb6 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -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); |