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Subject: Re: [PATCH 2/2] dma: remove unsupported gfp_mask parameter from
 dma_alloc_from_contiguous()
To:     Marek Szyprowski <m.szyprowski@samsung.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linuxppc-dev@lists.ozlabs.org, iommu@lists.linux-foundation.org
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Michal Nazarewicz <mina86@mina86.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Christoph Hellwig <hch@lst.de>, Michal Hocko <mhocko@suse.com>,
        Russell King <linux@armlinux.org.uk>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Paul Mackerras <paulus@ozlabs.org>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Chris Zankel <chris@zankel.net>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Joerg Roedel <joro@8bytes.org>,
        Sumit Semwal <sumit.semwal@linaro.org>,
        Robin Murphy <robin.murphy@arm.com>,
        Laura Abbott <labbott@redhat.com>,
        linaro-mm-sig@lists.linaro.org
References: <20180709121956.20200-1-m.szyprowski@samsung.com>
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From:   Vlastimil Babka <vbabka@suse.cz>
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Date:   Mon, 16 Jul 2018 09:45:31 +0200
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On 07/09/2018 02:19 PM, Marek Szyprowski wrote:
> The CMA memory allocator doesn't support standard gfp flags for memory
> allocation, so there is no point having it as a parameter for
> dma_alloc_from_contiguous() function. Replace it by a boolean no_warn
> argument, which covers all the underlaying cma_alloc() function supports.
> 
> This will help to avoid giving false feeling that this function supports
> standard gfp flags and callers can pass __GFP_ZERO to get zeroed buffer,
> what has already been an issue: see commit dd65a941f6ba ("arm64:
> dma-mapping: clear buffers allocated with FORCE_CONTIGUOUS flag").
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>

Acked-by: Vlastimil Babka <vbabka@suse.cz>