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

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Message-Id: <20200821133548.be58a3b0881b41a32759fa04@linux-foundation.org>
Date:   Fri, 21 Aug 2020 13:35:48 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Joerg Roedel <joro@...tes.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Chris Wilson <chris@...is-wilson.co.uk>,
        intel-gfx@...ts.freedesktop.org, Pavel Machek <pavel@....cz>,
        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()

On Fri, 21 Aug 2020 14:37:46 +0200 Joerg Roedel <joro@...tes.org> wrote:

> 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.