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Date:   Tue, 25 Aug 2020 15:26:12 +0200
From:   Christoph Hellwig <>
To:     Marek Szyprowski <>
Cc:     Christoph Hellwig <>,
        Mauro Carvalho Chehab <>,
        Thomas Bogendoerfer <>,
        "James E.J. Bottomley" <>,
        Joonyoung Shim <>,
        Seung-Woo Kim <>,
        Kyungmin Park <>,
        Ben Skeggs <>,
        Pawel Osciak <>,
        Matt Porter <>,,
        Tom Lendacky <>,,,,,,,,,,,,,,
Subject: Re: a saner API for allocating DMA addressable pages

On Tue, Aug 25, 2020 at 01:30:41PM +0200, Marek Szyprowski wrote:
> I really wonder what is the difference between this new API and 
> alloc_pages(GFP_DMA, n). Is this API really needed? I thought that this 
> is legacy thing to be removed one day...

The difference is that the pages returned are guranteed to be addressable
by the devie.  This is a very important difference that matters for
a lot of use cases.

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