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

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Message-ID: <20201024075959.GA4285@infradead.org>
Date:   Sat, 24 Oct 2020 08:59:59 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Roman Gushchin <guro@...com>
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()

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.