linux-kernel - Re: [PATCH] dma-pool: Do not allocate pool memory from CMA

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Message-ID: <alpine.DEB.2.23.453.2007091447240.972523@chino.kir.corp.google.com>
Date:   Thu, 9 Jul 2020 14:47:38 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
cc:     Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        linux-rpi-kernel@...ts.infradead.org, jeremy.linton@....com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dma-pool: Do not allocate pool memory from CMA

On Wed, 8 Jul 2020, Nicolas Saenz Julienne wrote:

> There is no guarantee to CMA's placement, so allocating a zone specific
> atomic pool from CMA might return memory from a completely different
> memory zone. So stop using it.
> 
> Fixes: c84dc6e68a1d ("dma-pool: add additional coherent pools to map to gfp mask")
> Reported-by: Jeremy Linton <jeremy.linton@....com>
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>

Acked-by: David Rientjes <rientjes@...gle.com>

Thanks Nicolas!