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Subject: Re: [PATCH v2] mm: Track page table modifications in __apply_to_page_range()
From:   Chris Wilson <chris@chris-wilson.co.uk>
Cc:     linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        intel-gfx@lists.freedesktop.org, Pavel Machek <pavel@ucw.cz>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Dave Airlie <airlied@redhat.com>,
        Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@intel.com>,
        David Vrabel <david.vrabel@citrix.com>,
        Joerg Roedel <jroedel@suse.de>, stable@vger.kernel.org
To:     Andrew Morton <akpm@linux-foundation.org>,
        Joerg Roedel <joro@8bytes.org>
Date:   Fri, 21 Aug 2020 19:51:42 +0100
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Quoting Joerg Roedel (2020-08-21 13:37:46)
> From: Joerg Roedel <jroedel@suse.de>
> 
> 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@chris-wilson.co.uk> #x86-32
> Cc: <stable@vger.kernel.org> # v5.8+
> Signed-off-by: Joerg Roedel <jroedel@suse.de>

I've doubled check that this patch by itself fixes our x86-32 vmapping
issue. Thanks,
-Chris