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SubjectRe: [PATCH 01/23] tref: Implement task references.
Oleg Nesterov wrote:
>
> void put_pid_ref(struct pid_ref *ref)
> {
> if (!ref || !atomic_dec_and_test(&ref->count))
> return;
>
> write_lock_irq(&tasklist_lock);
> if (!atomic_read(&ref->count)) {

Ok, this is racy, but the fix is possible.

Oleg.
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