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Date:   Sat, 22 Aug 2020 23:25:41 +0200
From:   Pavel Machek <>
To:     Chris Wilson <>
Cc:     Andrew Morton <>,
        Joerg Roedel <>,,,,
        Linus Torvalds <>,
        Dave Airlie <>,
        Joonas Lahtinen <>,
        Rodrigo Vivi <>,
        David Vrabel <>,
        Joerg Roedel <>,
Subject: Re: [PATCH v2] mm: Track page table modifications in

> > > 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.
> > 
> > There's no description here of the user-visible effects of the bug. 
> > Please always provide this, especially when proposing a -stable
> > backport.  Take pity upon all the downstream kernel maintainers who are
> > staring at this wondering whether they should risk adding it to their
> > kernels.
> The impact appears limited to x86-32, where apply_to_page_range may miss
> updating the PMD. That leads to explosions in drivers like

Is this alone supposed to fix my problems with graphics on Thinkpad
X60? Let me try...

Best regards,
(cesky, pictures)

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