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| author | Costa Shulyupin <costa.shul@redhat.com> | 2024-02-22 22:08:56 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2024-02-22 22:18:21 +0100 |
| commit | 56c2cb10120894be40c40a9bf0ce798da14c50f6 (patch) | |
| tree | 45321068344164befe88639a54e09c949cb8ef02 /kernel/time | |
| parent | b2cf7507e18649a30512515ec0ca89f26b2c2d0f (diff) | |
| download | linux-56c2cb10120894be40c40a9bf0ce798da14c50f6.tar.gz linux-56c2cb10120894be40c40a9bf0ce798da14c50f6.tar.bz2 linux-56c2cb10120894be40c40a9bf0ce798da14c50f6.zip | |
hrtimer: Select housekeeping CPU during migration
During CPU-down hotplug, hrtimers may migrate to isolated CPUs,
compromising CPU isolation.
Address this issue by masking valid CPUs for hrtimers using
housekeeping_cpumask(HK_TYPE_TIMER).
Suggested-by: Waiman Long <longman@redhat.com>
Signed-off-by: Costa Shulyupin <costa.shul@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Waiman Long <longman@redhat.com>
Link: https://lore.kernel.org/r/20240222200856.569036-1-costa.shul@redhat.com
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/hrtimer.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c index 5a98b35b0576..1fd106af747d 100644 --- a/kernel/time/hrtimer.c +++ b/kernel/time/hrtimer.c @@ -38,6 +38,7 @@ #include <linux/sched/deadline.h> #include <linux/sched/nohz.h> #include <linux/sched/debug.h> +#include <linux/sched/isolation.h> #include <linux/timer.h> #include <linux/freezer.h> #include <linux/compat.h> @@ -2225,8 +2226,8 @@ static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base, int hrtimers_cpu_dying(unsigned int dying_cpu) { + int i, ncpu = cpumask_any_and(cpu_active_mask, housekeeping_cpumask(HK_TYPE_TIMER)); struct hrtimer_cpu_base *old_base, *new_base; - int i, ncpu = cpumask_first(cpu_active_mask); tick_cancel_sched_timer(dying_cpu); |