linux-kernel - Re: [PATCH v1 1/2] mm: cma: introduce cma_release

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Message-ID: <20201027195619.GD827280@carbon.dhcp.thefacebook.com>
Date:   Tue, 27 Oct 2020 12:56:19 -0700
From:   Roman Gushchin <guro@...com>
To:     Christoph Hellwig <hch@...radead.org>
CC:     Andrew Morton <akpm@...ux-foundation.org>, Zi Yan <ziy@...dia.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        <saberlily.xia@...ilicon.com>, <linux-kernel@...r.kernel.org>,
        <linux-mm@...ck.org>, <kernel-team@...com>
Subject: Re: [PATCH v1 1/2] mm: cma: introduce cma_release_nowait()

On Sat, Oct 24, 2020 at 08:59:59AM +0100, Christoph Hellwig wrote:
> Btw, I think we also need to use this nonblocking version from
> dma_free_contiguous.  dma_free* is defined to not block.  In practice
> callers mostly care if they also did GFP_ATOMIC allocations, which
> don't dip into CMA, but I think we do have a problem.

It's a good point!
Do you mind mastering a patch? I can include it into the patchset.

Thanks!