From: Christoph Hellwig <hch@lst.de>
To: Joonsoo Kim <js1304@gmail.com>
Cc: Michal Hocko <mhocko@kernel.org>,
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
Subject: Re: [PATCH 1/2] mm/cma: remove unsupported gfp_mask parameter from cma_alloc()
Date: Thu, 12 Jul 2018 09:15:36 +0200 [thread overview]
Message-ID: <20180712071536.GA15506@lst.de> (raw)
In-Reply-To: <CAAmzW4M3KADCZD9+B2h7=WsYksGtg-GzYRCJjbqK5Scceynrrg@mail.gmail.com>
On Thu, Jul 12, 2018 at 11:48:47AM +0900, Joonsoo Kim wrote:
> One of existing user is general DMA layer and it takes gfp flags that is
> provided by user. I don't check all the DMA allocation sites but how do
> you convince that none of them try to use anything other
> than GFP_KERNEL [|__GFP_NOWARN]?
They use a few others things still like __GFP_COMP, __GPF_DMA or
GFP_HUGEPAGE. But all these are bogus as we have various implementations
that can't respect them. I plan to get rid of the gfp_t argument
in the dma_map_ops alloc method in a few merge windows because of that,
but it needs further implementation consolidation first.
next prev parent reply other threads:[~2018-07-12 7:13 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20180709121956.20200-1-m.szyprowski@samsung.com>
[not found] ` <CGME20180709122019eucas1p2340da484acfcc932537e6014f4fd2c29@eucas1p2.samsung.com>
2018-07-09 12:19 ` [PATCH 1/2] mm/cma: remove unsupported gfp_mask parameter from cma_alloc() Marek Szyprowski
2018-07-09 13:09 ` Michal Hocko
2018-07-09 17:27 ` Laura Abbott
2018-07-10 7:19 ` Joonsoo Kim
2018-07-10 9:50 ` Michal Hocko
2018-07-11 7:35 ` Joonsoo Kim
2018-07-11 8:54 ` Michal Hocko
2018-07-12 2:48 ` Joonsoo Kim
2018-07-12 7:15 ` Christoph Hellwig [this message]
2018-07-13 6:29 ` Joonsoo Kim
2018-07-16 7:45 ` Vlastimil Babka
2018-07-17 15:08 ` Christoph Hellwig
[not found] ` <CGME20180709122020eucas1p21a71b092975cb4a3b9954ffc63f699d1@eucas1p2.samsung.com>
2018-07-09 12:19 ` [PATCH 2/2] dma: remove unsupported gfp_mask parameter from dma_alloc_from_contiguous() Marek Szyprowski
2018-07-16 7:45 ` Vlastimil Babka
2018-07-17 15:08 ` Christoph Hellwig
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