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Date: Tue, 10 Jul 2018 11:50:56 +0200
From: Michal Hocko <mhocko@kernel.org>
Subject: Re: [PATCH 1/2] mm/cma: remove unsupported gfp_mask parameter from
 cma_alloc()
Message-ID: <20180710095056.GE14284@dhcp22.suse.cz>
References: <CGME20180709122019eucas1p2340da484acfcc932537e6014f4fd2c29@eucas1p2.samsung.com>
 <20180709121956.20200-1-m.szyprowski@samsung.com>
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To: Joonsoo Kim <js1304@gmail.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>, Linux Memory Management List <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>, linux-arm-kernel@lists.infradead.org, linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, iommu@lists.linux-foundation.org, Andrew Morton <akpm@linux-foundation.org>, Michal Nazarewicz <mina86@mina86.com>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Vlastimil Babka <vbabka@suse.cz>, Christoph Hellwig <hch@lst.de>, 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

On Tue 10-07-18 16:19:32, Joonsoo Kim wrote:
> Hello, Marek.
> 
> 2018-07-09 21:19 GMT+09:00 Marek Szyprowski <m.szyprowski@samsung.com>:
> > cma_alloc() function doesn't really support gfp flags other than
> > __GFP_NOWARN, so convert gfp_mask parameter to boolean no_warn parameter.
> 
> Although gfp_mask isn't used in cma_alloc() except no_warn, it can be used
> in alloc_contig_range(). For example, if passed gfp mask has no __GFP_FS,
> compaction(isolation) would work differently. Do you have considered
> such a case?

Does any of cma_alloc users actually care about GFP_NO{FS,IO}?
-- 
Michal Hocko
SUSE Labs