linux-ext4 - Re: [PATCH v1 00/12] MEMORY_DEVICE_COHERENT for CPU-accessible coherent device memory

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Date:   Tue, 12 Oct 2021 16:24:25 -0400
From:   Felix Kuehling <felix.kuehling@....com>
To:     Matthew Wilcox <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Alex Sierra <alex.sierra@....com>, linux-mm@...ck.org,
        rcampbell@...dia.com, linux-ext4@...r.kernel.org,
        linux-xfs@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, hch@....de, jgg@...dia.com,
        jglisse@...hat.com, apopple@...dia.com
Subject: Re: [PATCH v1 00/12] MEMORY_DEVICE_COHERENT for CPU-accessible
 coherent device memory


Am 2021-10-12 um 3:11 p.m. schrieb Matthew Wilcox:
> 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.

Maybe we should split the first two patches into a separate series, and
get it merged first, while the more controversial stuff is still under
review?

Thanks,
  Felix