linux-kernel - Re: [PATCH 3/3] task_work: use TIF

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Date:   Sat, 03 Oct 2020 03:49:00 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Oleg Nesterov <oleg@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
        io-uring@...r.kernel.org, peterz@...radead.org
Subject: Re: [PATCH 3/3] task_work: use TIF_TASKWORK if available

On Fri, Oct 02 2020 at 17:38, Oleg Nesterov wrote:
> On 10/02, Thomas Gleixner wrote:
>>
>> I think it's fundamentaly wrong that we have several places and several
>> flags which handle task_work_run() instead of having exactly one place
>> and one flag.
>
> Damn yes, agreed.

Actually there are TWO places, but they don't interfere:

   1) exit to user

   2) enter guest

>From the kernel POV they are pretty much the same as both are leaving
the kernel domain. But they have a few subtle different requirements
what has to be done or not.

So any change to that logic needs to fixup both places,

Thanks,

        tglx