linux-kernel - Re: [PATCH v2] mm: Track page table modifications in __apply_to_page

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Date:   Sun, 23 Aug 2020 12:44:59 +0200
From:   Pavel Machek <pavel@....cz>
To:     Joerg Roedel <joro@...tes.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Chris Wilson <chris@...is-wilson.co.uk>,
        intel-gfx@...ts.freedesktop.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Dave Airlie <airlied@...hat.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Vrabel <david.vrabel@...rix.com>,
        Joerg Roedel <jroedel@...e.de>, stable@...r.kernel.org
Subject: Re: [PATCH v2] mm: Track page table modifications in
 __apply_to_page_range()

Hi!

> The __apply_to_page_range() function is also used to change and/or
> allocate page-table pages in the vmalloc area of the address space.
> Make sure these changes get synchronized to other page-tables in the
> system by calling arch_sync_kernel_mappings() when necessary.
> 
> Tested-by: Chris Wilson <chris@...is-wilson.co.uk> #x86-32
> Cc: <stable@...r.kernel.org> # v5.8+
> Signed-off-by: Joerg Roedel <jroedel@...e.de>

This seems to solve screen blinking problems on Thinkpad X60. (It
already survived few unison runs, which would usually kill it.).

Tested-by: Pavel Machek <pavel@....cz>

Thanks and 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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