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

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Date:   Tue, 10 Jul 2018 11:50:56 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Joonsoo Kim <js1304@...il.com>
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        iommu@...ts.linux-foundation.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Nazarewicz <mina86@...a86.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Christoph Hellwig <hch@....de>,
        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 Tue 10-07-18 16:19:32, Joonsoo Kim wrote:
> Hello, Marek.
> 
> 2018-07-09 21:19 GMT+09:00 Marek Szyprowski <m.szyprowski@...sung.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