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
<rppt-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>,
Matthias Brugger
<matthias.bgg-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Joonsoo Kim <iamjoonsoo.kim-Hm3cg6mZ9cc@public.gmane.org>,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
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
<mgorman-3eNAlZScCAx27rWaFMvyedHuzzzSOjJt@public.gmane.org>
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.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@infradead.org>
To: Robin Murphy <robin.murphy@arm.com>
Cc: Michal Hocko <mhocko@suse.com>, Will Deacon <will.deacon@arm.com>,
Levin Alexander <Alexander.Levin@microsoft.com>,
linux-mm@kvack.org, Christoph Lameter <cl@linux.com>,
Nicolas Boichat <drinkcat@chromium.org>,
Huaisheng Ye <yehs1@lenovo.com>, Joerg Roedel <joro@8bytes.org>,
Matthew Wilcox <willy@infradead.org>,
Christoph Hellwig <hch@infradead.org>,
Yong Wu <yong.wu@mediatek.com>,
David Rientjes <rientjes@google.com>,
yingjoe.chen@mediatek.com, Vlastimil Babka <vbabka@suse.cz>,
Tomasz Figa <tfiga@google.com>,
Mike Rapoport <rppt@linux.vnet.ibm.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Pekka Enberg <penberg@kernel.org>,
iommu@lists.linux-foundation.org,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@techsingularity.net>
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@arm.com>
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.
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@infradead.org>
To: Robin Murphy <robin.murphy@arm.com>
Cc: Christoph Hellwig <hch@infradead.org>,
Nicolas Boichat <drinkcat@chromium.org>,
Will Deacon <will.deacon@arm.com>, Joerg Roedel <joro@8bytes.org>,
Christoph Lameter <cl@linux.com>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>, Michal Hocko <mhocko@suse.com>,
Mel Gorman <mgorman@techsingularity.net>,
Levin Alexander <Alexander.Levin@microsoft.com>,
Huaisheng Ye <yehs1@lenovo.com>,
Mike Rapoport <rppt@linux.vnet.ibm.com>,
linux-arm-kernel@lists.infradead.org,
iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, Yong Wu <yong.wu@mediatek.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
Tomasz Figa <tfiga@google.com>,
yingjoe.chen@mediatek.com, Matthew Wilcox <willy@infradead.org>
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@arm.com>
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: 75+ 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 ` Nicolas Boichat
2018-12-05 5:48 ` 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 5:48 ` Nicolas Boichat
2018-12-05 5:48 ` Nicolas Boichat
2018-12-05 13:34 ` Vlastimil Babka
2018-12-05 13:34 ` Vlastimil Babka
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
2018-12-05 5:48 ` Nicolas Boichat
2018-12-05 5:48 ` Nicolas Boichat
[not found] ` <20181205054828.183476-3-drinkcat-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2018-12-05 7:25 ` Wei Yang
2018-12-05 7:25 ` Wei Yang
2018-12-05 7:25 ` Wei Yang
2018-12-05 7:39 ` Nicolas Boichat
2018-12-05 7:39 ` Nicolas Boichat
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 9:18 ` Wei Yang
2018-12-05 9:18 ` Wei Yang
2018-12-05 12:18 ` Wei Yang
2018-12-05 12:18 ` Wei Yang
2018-12-05 12:18 ` Wei Yang
2018-12-06 0:41 ` Nicolas Boichat
2018-12-06 0:41 ` Nicolas Boichat
2018-12-06 0:41 ` Nicolas Boichat
2018-12-06 3:32 ` Wei Yang
2018-12-06 3:32 ` Wei Yang
2018-12-06 3:32 ` Wei Yang
2018-12-06 3:55 ` Nicolas Boichat
2018-12-06 3:55 ` Nicolas Boichat
2018-12-06 3:55 ` Nicolas Boichat
2018-12-06 6:29 ` Wei Yang
2018-12-06 6:29 ` Wei Yang
2018-12-06 6:29 ` Wei Yang
2018-12-05 9:55 ` Michal Hocko
2018-12-05 9:55 ` Michal Hocko
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 11:01 ` Nicolas Boichat
2018-12-05 11:01 ` Nicolas Boichat
2018-12-05 11:37 ` Michal Hocko
2018-12-05 11:37 ` Michal Hocko
2018-12-05 11:37 ` Michal Hocko
2018-12-05 13:59 ` Vlastimil Babka
2018-12-05 13:59 ` Vlastimil Babka
2018-12-05 13:59 ` Vlastimil Babka
2018-12-06 3:49 ` Nicolas Boichat
2018-12-06 3:49 ` Nicolas Boichat
2018-12-06 3:49 ` Nicolas Boichat
2018-12-06 9:34 ` Vlastimil Babka
2018-12-06 9:34 ` Vlastimil Babka
2018-12-06 9:34 ` Vlastimil Babka
2018-12-06 10:09 ` Nicolas Boichat
2018-12-06 10:09 ` Nicolas Boichat
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 5:48 ` Nicolas Boichat
2018-12-05 5:48 ` Nicolas Boichat
2018-12-05 13:54 ` Christoph Hellwig
2018-12-05 13:54 ` Christoph Hellwig
2018-12-05 13:54 ` Christoph Hellwig
2018-12-05 14:40 ` Robin Murphy
2018-12-05 14:40 ` Robin Murphy
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 14:43 ` Christoph Hellwig
2018-12-05 14:43 ` Christoph Hellwig
2018-12-05 14:46 ` Will Deacon
2018-12-05 14:46 ` Will Deacon
2018-12-05 14:46 ` Will Deacon
2018-12-05 14:43 ` Vlastimil Babka
2018-12-05 14:43 ` Vlastimil Babka
2018-12-05 14:43 ` Vlastimil Babka
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20181205144308.GA28409@infradead.org \
--to=hch-wegcikhe2lqwvfeawa7xhq@public.gmane.org \
--cc=Alexander.Levin-0li6OtcxBFHby3iVrkZq2A@public.gmane.org \
--cc=akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org \
--cc=cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org \
--cc=drinkcat-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org \
--cc=iamjoonsoo.kim-Hm3cg6mZ9cc@public.gmane.org \
--cc=iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org \
--cc=linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org \
--cc=linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org \
--cc=matthias.bgg-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org \
--cc=mgorman-3eNAlZScCAx27rWaFMvyedHuzzzSOjJt@public.gmane.org \
--cc=mhocko-IBi9RG/b67k@public.gmane.org \
--cc=penberg-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org \
--cc=rientjes-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org \
--cc=robin.murphy-5wv7dgnIgG8@public.gmane.org \
--cc=rppt-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org \
--cc=tfiga-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org \
--cc=vbabka-AlSwsSmVLrQ@public.gmane.org \
--cc=will.deacon-5wv7dgnIgG8@public.gmane.org \
--cc=willy-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org \
--cc=yehs1-6jq1YtArVR3QT0dZR+AlfA@public.gmane.org \
--cc=yingjoe.chen-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.