From: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
To: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
Cc: Michal Hocko <mhocko-IBi9RG/b67k@public.gmane.org>,
Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>,
Levin Alexander
<Alexander.Levin-0li6OtcxBFHby3iVrkZq2A@public.gmane.org>,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
Christoph Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>,
Nicolas Boichat
<drinkcat-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
Huaisheng Ye <yehs1-6jq1YtArVR3QT0dZR+AlfA@public.gmane.org>,
Matthew Wilcox <willy-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
David Rientjes <rientjes-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
yingjoe.chen-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org,
Vlastimil Babka <vbabka-AlSwsSmVLrQ@public.gmane.org>,
Tomasz Figa <tfiga-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Mike Rapoport
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Joonsoo Kim <iamjoonsoo.kim-Hm3cg6mZ9cc@public.gmane.org>,
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Pekka Enberg <penberg-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
Mel Gorman
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Subject: Re: [PATCH v4 3/3] iommu/io-pgtable-arm-v7s: Request DMA32 memory, and improve debugging
Date: Wed, 5 Dec 2018 06:43:08 -0800 [thread overview]
Message-ID: <20181205144308.GA28409@infradead.org> (raw)
In-Reply-To: <1d211576-9153-cca1-5cd0-8c9881bd3fa4-5wv7dgnIgG8@public.gmane.org>
On Wed, Dec 05, 2018 at 02:40:06PM +0000, Robin Murphy wrote:
> 32-bit Arm doesn't have ZONE_DMA32, but has (or at least had at the time) a
> 2GB ZONE_DMA. Whether we actually need that or not depends on how this all
> interacts with LPAE and highmem, but I'm not sure of those details off-hand.
Well, arm32 can't address more than 32-bits in the linear kernel
mapping, so GFP_KERNEL should be perfectly fine there if the limit
really is 32-bits and not 31 or smaller because someone stole a bit
or two somewhere.
next prev parent reply other threads:[~2018-12-05 14:43 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-05 5:48 [PATCH v4 0/3] iommu/io-pgtable-arm-v7s: Use DMA32 zone for page tables Nicolas Boichat
2018-12-05 5:48 ` [PATCH v4 1/3] mm: slab/slub: Add check_slab_flags function to check for valid flags Nicolas Boichat
2018-12-05 13:34 ` Vlastimil Babka
[not found] ` <20181205054828.183476-1-drinkcat-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2018-12-05 5:48 ` [PATCH v4 2/3] mm: Add support for kmem caches in DMA32 zone Nicolas Boichat
[not found] ` <20181205054828.183476-3-drinkcat-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2018-12-05 7:25 ` Wei Yang
2018-12-05 7:39 ` Nicolas Boichat
[not found] ` <CANMq1KCi-k_4-66pMfvByzsjpf1H6_bvC82Ow0b_jEH6B3LHwA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-12-05 9:18 ` Wei Yang
2018-12-05 12:18 ` Wei Yang
2018-12-06 0:41 ` Nicolas Boichat
2018-12-06 3:32 ` Wei Yang
2018-12-06 3:55 ` Nicolas Boichat
2018-12-06 6:29 ` Wei Yang
2018-12-05 9:55 ` Michal Hocko
[not found] ` <20181205095557.GE1286-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2018-12-05 11:01 ` Nicolas Boichat
2018-12-05 11:37 ` Michal Hocko
2018-12-05 13:59 ` Vlastimil Babka
2018-12-06 3:49 ` Nicolas Boichat
2018-12-06 9:34 ` Vlastimil Babka
2018-12-06 10:09 ` Nicolas Boichat
2018-12-05 5:48 ` [PATCH v4 3/3] iommu/io-pgtable-arm-v7s: Request DMA32 memory, and improve debugging Nicolas Boichat
2018-12-05 13:54 ` Christoph Hellwig
2018-12-05 14:40 ` Robin Murphy
[not found] ` <1d211576-9153-cca1-5cd0-8c9881bd3fa4-5wv7dgnIgG8@public.gmane.org>
2018-12-05 14:43 ` Christoph Hellwig [this message]
2018-12-05 14:46 ` Will Deacon
2018-12-05 14:43 ` Vlastimil Babka
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