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Date:   Sun, 23 Aug 2020 12:44:59 +0200
From:   Pavel Machek <>
To:     Joerg Roedel <>
Cc:     Andrew Morton <>,,,
        Chris Wilson <>,,
        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.
> Tested-by: Chris Wilson <> #x86-32
> Cc: <> # v5.8+
> Signed-off-by: Joerg Roedel <>

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 <>

Thanks and best regards,
(cesky, pictures)

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