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Date:   Thu, 5 Mar 2020 16:43:12 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     David Rientjes <rientjes@google.com>
Cc:     Christoph Hellwig <hch@lst.de>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        "Singh, Brijesh" <brijesh.singh@amd.com>,
        "Grimm, Jon" <jon.grimm@amd.com>, Joerg Roedel <joro@8bytes.org>,
        baekhw@google.com,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "iommu@lists.linux-foundation.org" <iommu@lists.linux-foundation.org>
Subject: Re: [rfc 3/6] dma-remap: wire up the atomic pools depending on gfp
 mask
Message-ID: <20200305154312.GB5332@lst.de>
References: <alpine.DEB.2.21.1912311738130.68206@chino.kir.corp.google.com> <b22416ec-cc28-3fd2-3a10-89840be173fa@amd.com> <alpine.DEB.2.21.2002280118461.165532@chino.kir.corp.google.com> <alpine.DEB.2.21.2003011535510.213582@chino.kir.corp.google.com> <alpine.DEB.2.21.2003011537220.213582@chino.kir.corp.google.com>
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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.