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sched/core: Fix a missed update of user_cpus_ptr
Since commit8f9ea86fdf
("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:8f9ea86fdf
("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
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1 changed files with 4 additions and 1 deletions
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@ -2951,8 +2951,11 @@ static int __set_cpus_allowed_ptr_locked(struct task_struct *p,
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}
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if (!(ctx->flags & SCA_MIGRATE_ENABLE)) {
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if (cpumask_equal(&p->cpus_mask, ctx->new_mask))
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if (cpumask_equal(&p->cpus_mask, ctx->new_mask)) {
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if (ctx->flags & SCA_USER)
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swap(p->user_cpus_ptr, ctx->user_mask);
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goto out;
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}
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if (WARN_ON_ONCE(p == current &&
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is_migration_disabled(p) &&
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