On 08/21, Oleg Nesterov wrote:
>
> static inline bool cmp_xchg(struct callback_head **ptr, void *old, void *new)
> {
> return cmpxchg(ptr, old, new) == old;
> }
>
> int
> task_work_add(struct task_struct *task, struct callback_head *twork, bool
> notify)
> {
> do {
> twork->next = ACCESS_ONCE(task->task_works);
> if (unlikely(twork->next == TWORK_EXITED))
> return -ESRCH;
> } while (cmp_xchg(&task->task_works, twork->next, twork));
^^^^^^^^^^^^^^^
while (!cmp_xchg(...))
Oleg.
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