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| author | Waiman Long <longman@redhat.com> | 2023-02-03 13:18:49 -0500 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2023-02-13 16:36:14 +0100 |
| commit | df14b7f9efcda35e59bb6f50351aac25c50f6e24 (patch) | |
| tree | 15208c11d770890acf940a2aac92d5838d8761a9 /kernel | |
| parent | eedeb787ebb53de5c5dcf7b7b39d01bf1b0f037d (diff) | |
| download | lwn-df14b7f9efcda35e59bb6f50351aac25c50f6e24.tar.gz lwn-df14b7f9efcda35e59bb6f50351aac25c50f6e24.zip | |
sched/core: Fix a missed update of user_cpus_ptr
Since commit 8f9ea86fdf99 ("sched: Always preserve the user requested
cpumask"), a successful call to sched_setaffinity() should always save
the user requested cpu affinity mask in a task's user_cpus_ptr. However,
when the given cpu mask is the same as the current one, user_cpus_ptr
is not updated. Fix this by saving the user mask in this case too.
Fixes: 8f9ea86fdf99 ("sched: Always preserve the user requested cpumask")
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20230203181849.221943-1-longman@redhat.com
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched/core.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index e838feb6adc5..2a4918a1faa9 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2951,8 +2951,11 @@ static int __set_cpus_allowed_ptr_locked(struct task_struct *p, } if (!(ctx->flags & SCA_MIGRATE_ENABLE)) { - if (cpumask_equal(&p->cpus_mask, ctx->new_mask)) + if (cpumask_equal(&p->cpus_mask, ctx->new_mask)) { + if (ctx->flags & SCA_USER) + swap(p->user_cpus_ptr, ctx->user_mask); goto out; + } if (WARN_ON_ONCE(p == current && is_migration_disabled(p) && |