linux-kernel - Re: [PATCH v6 0/7] ARM: Fix dma_alloc

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Date:   Wed, 28 Jun 2017 09:33:33 +0200
From:   Benjamin Gaignard <benjamin.gaignard@...aro.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Russell King - ARM Linux <linux@...linux.org.uk>,
        Vladimir Murzin <vladimir.murzin@....com>,
        linux-arm-kernel@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Szemző András <sza@....hu>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexandre Torgue <alexandre.torgue@...com>,
        robin.murphy@....com, kbuild-all@...org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Joerg Roedel <jroedel@...e.de>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Michal Nazarewicz <mina86@...a86.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, Roger Quadros <rogerq@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Doug Ledford <dledford@...hat.com>
Subject: Re: [PATCH v6 0/7] ARM: Fix dma_alloc_coherent() and friends for NOMMU

2017-06-27 19:36 GMT+02:00 Christoph Hellwig <hch@....de>:
> On Tue, Jun 27, 2017 at 05:54:17PM +0100, Russell King - ARM Linux wrote:
>> On Tue, Jun 27, 2017 at 05:27:53PM +0200, Christoph Hellwig wrote:
>> > I've applied patches 1, 3 and 4 to the dma-mapping tree.  2 will need
>> > a respin for less code duplication.  I'd be happy to take 5,6 and 7 if
>> > Russell is fine with that.
>>
>> If Vladimir is okay with those going in without patch 2, then I'm
>> happy - I seem to remember a mail from Vladimir stating that they
>> depended on some of the previous patches, but I don't know which.
>>
>> Acked-by: Russell King <rmk+kernel@...linux.org.uk>
>
> Thanks, I'll add them.  Patch 2 only adds optional mmap functionality,
> so it's not really required.  Although I'd really like to see a fixed
> up version that I can merge anyway.

Without mmap we will have a regression for nommu platform which are using
dma_alloc_coherent and specialy in drm/kms where dumb buffer are allocated
like that.
Even with this problem I think the patches should be merged but we should have
a quick fix for mmap.

Benjamin