linux-kernel - Re: [PATCH 2/7] xen/gntdev,x86: Remove apply_to_page

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Message-ID: <20210412082640.GB4372@lst.de>
Date:   Mon, 12 Apr 2021 10:26:40 +0200
From:   Christoph Hellwig <hch@....de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        boris.ostrovsky@...cle.com, jgross@...e.com,
        sstabellini@...nel.org, x86@...nel.org,
        jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, chris@...is-wilson.co.uk,
        intel-gfx@...ts.freedesktop.org, linux-mm@...ck.org,
        keescook@...omium.org, hch@....de
Subject: Re: [PATCH 2/7] xen/gntdev,x86: Remove apply_to_page_range() use
 from module

On Mon, Apr 12, 2021 at 10:00:14AM +0200, Peter Zijlstra wrote:
> Instead of relying on apply_to_page_range() being available to
> modules, move its use into core kernel code and export it's
> application.

This doesn't exactly look great, but at least it contains the damage..

> 
> NOTE: ideally we do: use_ptemod = !auto_translate_physmap &&
> gnttab_map_avail_bits and remove this hack.

Given how much pain the !auto_translate_physmap case causes all over
the kernel I wonder what a realistic timeline might be for dropping
support for this case might be..