linux-kernel - Re: [PATCH] task_work: remove fifo ordering guarantee

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Date:	Fri, 28 Aug 2015 20:19:42 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Maciej Żenczykowski <maze@...gle.com>
Subject: Re: [PATCH] task_work: remove fifo ordering guarantee

On Fri, Aug 28, 2015 at 7:42 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> We could add yet another cond_resched() in the reverse loop, or we
> can simply remove the reversal, as I do not think anything
> would depend on order of task_work_add() submitted works.

So I think this should be ok, with things like file closing not really
caring about ordering as far as I can tell.

However, has anybody gone through all the task-work users? I looked
quickly at the task_work_add() cases, and didn't see anything that
looked like it would care, but others should look too. In the vfs,
theres' the delayed fput and mnt freeing, and there's a keyring
installation one.

The threaded irq handlers use it as that exit-time hack, which
certainly shouldn't care, and there's some uprobe thing.

Can anybody see anything fishy?

               Linus
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