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Date:   Tue, 12 Oct 2021 20:11:14 +0100
From:   Matthew Wilcox <>
To:     Andrew Morton <>
Cc:     Alex Sierra <>,,,,,,,,,,,
Subject: Re: [PATCH v1 00/12] MEMORY_DEVICE_COHERENT for CPU-accessible
 coherent device memory

On Tue, Oct 12, 2021 at 11:39:57AM -0700, Andrew Morton wrote:
> Because I must ask: if this feature is for one single computer which
> presumably has a custom kernel, why add it to mainline Linux?

I think in particular patch 2 deserves to be merged because it removes
a ton of cruft from every call to put_page() (at least if you're using
a distro config).  It makes me nervous, but I think it's the right
thing to do.  It may well need more fixups after it has been merged,
but that's life.

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