linux-kernel - Re: [bisected] Re: 7dc8f11437: regression in 5.7-rc0, hangs while attempting to run X

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Message-ID: <20200403130031.GA4107@duo.ucw.cz>
Date:   Fri, 3 Apr 2020 15:00:31 +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: Re: [bisected] Re: 7dc8f11437: regression in 5.7-rc0, hangs while
 attempting to run X

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.

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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