linux-kernel - Re: [rfc 3/6] dma-remap: wire up the atomic pools depending on gfp mask

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Message-ID: <20200305154312.GB5332@lst.de>
Date:   Thu, 5 Mar 2020 16:43:12 +0100
From:   Christoph Hellwig <hch@....de>
To:     David Rientjes <rientjes@...gle.com>
Cc:     Christoph Hellwig <hch@....de>,
        Tom Lendacky <thomas.lendacky@....com>,
        "Singh, Brijesh" <brijesh.singh@....com>,
        "Grimm, Jon" <jon.grimm@....com>, Joerg Roedel <joro@...tes.org>,
        baekhw@...gle.com,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>
Subject: Re: [rfc 3/6] dma-remap: wire up the atomic pools depending on gfp
 mask

On Sun, Mar 01, 2020 at 04:05:16PM -0800, David Rientjes wrote:
> 
> When allocating non-blockable memory, determine the optimal gfp mask of
> the device and use the appropriate atomic pool.
> 
> The coherent DMA mask will remain the same between allocation and free
> and, thus, memory will be freed to the same atomic pool it was allocated
> from.

I think this should go into the previous patch, as it is rather pointless
without the changes in this one.