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sched/core: Fix a missed update of user_cpus_ptr 

Since commit 8f9ea86fdf ("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
This commit is contained in:
Waiman Long 2023-02-03 13:18:49 -05:00 committed by Peter Zijlstra
parent eedeb787eb
commit df14b7f9ef
1 changed files with 4 additions and 1 deletions
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5
kernel/sched/core.c
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@ -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) &&