Re: [PATCH AUTOSEL 4.18 08/27] Input: evdev - add a schedule point in evdev_write()

[Sasha Levin]

On Mon, Oct 22, 2018 at 10:02:44AM -0700, Dmitry Torokhov wrote:
> Hi Sasha,
>
> On Mon, Oct 22, 2018 at 06:19:05AM -0400, Sasha Levin wrote:
> > From: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
> >
> > [ Upstream commit 36d2582ff235b4e01ad64a734c877a52dc762d9c ]
> >
> > Large writes to evdev interface may cause rcu stalls. Let's add
> > cond_resched() to the loop to avoid this.
>
> This is not needed in stable:
>
> - the interfaces are not accessible for unprivileged users so there is
>  no DOS concerns
> - the issue can only happen on non-preemptible kernels
> - the issue only showed up with synthetic test and not real life use
>  cases
> - this is not a regression
>
> The same goes to similar patches to mousedev, joydev and uinput that you
> autoselected.

Dropped, thanks!

--
Thanks,
Sasha