linux-kernel - Re: Linus, please revert 7dc8f11437: regression in 5.7-rc0, hangs while attempting to run X

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Date:   Fri, 10 Apr 2020 13:25:47 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Pavel Machek <pavel@....cz>
Cc:     Chris Wilson <chris@...is-wilson.co.uk>,
        Dave Airlie <airlied@...hat.com>,
        intel-gfx@...ts.freedesktop.org,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        kernel list <linux-kernel@...r.kernel.org>,
        matthew.auld@...el.com, Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Peter Anvin <hpa@...or.com>
Subject: Re: Linus, please revert 7dc8f11437: regression in 5.7-rc0, hangs
 while attempting to run X

On Tue, Apr 7, 2020 at 12:48 AM Pavel Machek <pavel@....cz> wrote:
>
> >
> > Beyond the fix already submitted?
>
> I did not get that one, can I have a pointer?

What's the status of this one?

I'm assuming the fix is commit 721017cf4bd8 ("drm/i915/gem: Ignore
readonly failures when updating relics"), but didn't see a reply to
the query or a confirmation of things working..

Btw, Chris, that __put_user() not testing the error should at least
have a comment. We don't have a working "__must_check" for those
things (because they are subtle macros, not functions), but if we did,
we'd get a compiler warning for not checking the error value.

            Linus