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

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Message-ID: <20200407072047.GA18532@amd.ucw.cz>
Date:   Tue, 7 Apr 2020 09:20:47 +0200
From:   Pavel Machek <pavel@....cz>
To:     kernel list <linux-kernel@...r.kernel.org>,
        jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, intel-gfx@...ts.freedesktop.org,
        airlied@...hat.com, chris@...is-wilson.co.uk,
        matthew.auld@...el.com,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com
Subject: Linus, please revert 7dc8f11437: regression in 5.7-rc0, hangs while
 attempting to run X


On Fri 2020-04-03 15:00:31, Pavel Machek wrote:
> Hi!
> 
> 7dc8f1143778a35b190f9413f228b3cf28f67f8d
> 
>     drm/i915/gem: Drop relocation slowpath
>     
>     Since the relocations are no longer performed under a global
>     struct_mutex, or any other lock, that is also held by pagefault handlers,
>     we can relax and allow our fast path to take a fault. As we no longer
>     need to abort the fast path for lock avoidance, we no longer need the
>     slow path handling at all.
> 
> causes regression on thinkpad x220: instead of starting X, I'm looking
> at blinking cursor.
> 
> Reverting the patch on too of 919dce24701f7b3 fixes things for me.

I have received no feedback from patch authors, and I believe we don't
want to break boot in -rc1 on Intel hardware... so the commit should
be simply reverted.

Best regards,
								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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