linux-kernel - Re: [PATCH 1/2] mm/cma: remove unsupported gfp_mask parameter from cma

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Message-ID: <7a7a88e5-e620-914c-3265-1a6383ae1974@suse.cz>
Date:   Mon, 16 Jul 2018 09:45:02 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Marek Szyprowski <m.szyprowski@...sung.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, iommu@...ts.linux-foundation.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Michal Nazarewicz <mina86@...a86.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Christoph Hellwig <hch@....de>, Michal Hocko <mhocko@...e.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Paul Mackerras <paulus@...abs.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Chris Zankel <chris@...kel.net>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Joerg Roedel <joro@...tes.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Robin Murphy <robin.murphy@....com>,
        Laura Abbott <labbott@...hat.com>,
        linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH 1/2] mm/cma: remove unsupported gfp_mask parameter from
 cma_alloc()

On 07/09/2018 02:19 PM, Marek Szyprowski wrote:
> cma_alloc() function doesn't really support gfp flags other than
> __GFP_NOWARN, so convert gfp_mask parameter to boolean no_warn parameter.
> 
> 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@...sung.com>

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