diff options
| author | Avi Weiss <thnkslprpt@gmail.com> | 2026-10-20 15:55:18 +0300 |
|---|---|---|
| committer | Frederic Weisbecker <frederic@kernel.org> | 2026-10-25 19:53:54 +0100 |
| commit | 78ff77ded78f2d3d6040705a3ab5a83cc45275e3 (patch) | |
| tree | e73b0408b830e1c81aac4d92b21424382e77c63e /kernel | |
| parent | c03c1a14507dfaf8b856c2608f9ac216021fc222 (diff) | |
kthread: Fall back when no preferred housekeeping CPU is online
kthread_fetch_affinity() falls back to the housekeeping mask
only when the intersection with the preferred mask is empty.
If the intersection contains only offline CPUs,
set_cpus_allowed_ptr() returns -EINVAL and the kthread keeps
its previous affinity, which may still include an isolated CPU.
Check whether the intersection contains an online CPU instead.
Fall back to the full housekeeping mask when none are online.
Fixes: e894f6339808 ("kthread: Honour kthreads preferred affinity after cpuset changes")
Signed-off-by: Avi Weiss <thnkslprpt@gmail.com>
Reviewed-by: Bradley Morgan <brads@mainlining.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/kthread.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/kthread.c b/kernel/kthread.c index a3f95c90456b..0dbff3b68ffb 100644 --- a/kernel/kthread.c +++ b/kernel/kthread.c @@ -343,7 +343,7 @@ static void kthread_fetch_affinity(struct kthread *kthread, struct cpumask *cpum } cpumask_and(cpumask, pref, housekeeping_cpumask(HK_TYPE_DOMAIN)); - if (cpumask_empty(cpumask)) + if (!cpumask_intersects(cpumask, cpu_online_mask)) cpumask_copy(cpumask, housekeeping_cpumask(HK_TYPE_DOMAIN)); } |