Re: [PATCH v4 1/3] task_work_add: generic process-context callbacks

[Oleg Nesterov]

probably I should also comment this part...

On 04/13, Linus Torvalds wrote:
>
> Alternatively, you must make the rule be that the data can only be
> freed by the caller *if* it was returned from "task_work_cancel()".

Exactly.

Once the caller does task_work_add(twork), it no longer "owns" this
twork.

But, if task_work_cancel() succeeds - you own it again.

> But then you can't allocate it on the stack any more, and have to
> allocate it separately.

Yes, unless you do task_work_add/cancel(current).

Oleg.

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