From: Arnd Bergmann <arnd@arndb.de>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Marek Szyprowski <m.szyprowski@samsung.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-media@vger.kernel.org, linux-mm@kvack.org,
linaro-mm-sig@lists.linaro.org,
Michal Nazarewicz <mina86@mina86.com>,
Kyungmin Park <kyungmin.park@samsung.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Daniel Walker <dwalker@codeaurora.org>,
Mel Gorman <mel@csn.ul.ie>,
Jesse Barker <jesse.barker@linaro.org>,
Jonathan Corbet <corbet@lwn.net>,
Shariq Hasnain <shariq.hasnain@linaro.org>,
Chunsang Jeong <chunsang.jeong@linaro.org>,
Dave Hansen <dave@linux.vnet.ibm.com>,
Benjamin Gaignard <benjamin.gaignard@linaro.org>,
Rob Clark <rob.clark@linaro.org>,
Ohad Ben-Cohen <ohad@wizery.com>
Subject: Re: [PATCHv22 14/16] X86: integrate CMA with DMA-mapping subsystem
Date: Wed, 22 Feb 2012 13:36:09 +0000 [thread overview]
Message-ID: <201202221336.09808.arnd@arndb.de> (raw)
In-Reply-To: <20120222090930.GS22562@n2100.arm.linux.org.uk>
On Wednesday 22 February 2012, Russell King - ARM Linux wrote:
> On Tue, Feb 21, 2012 at 04:18:02PM -0800, Andrew Morton wrote:
> > After a while I got it to compile for i386. arm didn't go so well,
> > partly because arm allmodconfig is presently horked (something to do
> > with Kconfig not setting PHYS_OFFSET) and partly because arm defconfig
> > doesn't permit CMA to be set. Got bored, gave up.
>
> That's not going to get fixed, unfortunately. It requires us to find
> some way to force various options to certain states on all*config
> builds, because not surprisingly a value of 'y', 'm' or 'n' doesn't
> work for integer or hex config options.
>
> So the only way all*config can be used on ARM is with a seed config file
> to force various options to particular states to ensure that we end up
> with a sane configuration that avoids crap like that.
>
> Alternatively, we need a way to tell kconfig that various options are to
> be set in certain ways in the Kconfig files for all*config to avoid it
> wanting values for hex or int options.
I usually set KCONFIG_ALLCONFIG to a file containing the extra options
I want, for another reason: As long as we are building platforms
separately, all{no,yes,mod}config and randconfig will always build
for the versatile platform instead of something more modern.
We could change that and make mach-vexpress the default, but we can
also wait until we have the initial multiplatform support done and
then use that one.
Building vexpress_defconfig (or most other defconfig, I would expect)
works fine with the CMA series applied. This should also work,
but there a few bugs in unrelated device drivers that would need to get
fixed first.
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- -sj3 allmodconfig \
KCONFIG_ALLCONFIG=$PWD/arch/arm/configs/vexpress_defconfig
Arnd
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next prev parent reply other threads:[~2012-02-22 13:36 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-17 19:30 [PATCHv22 00/16] Contiguous Memory Allocator Marek Szyprowski
2012-02-17 19:30 ` [PATCHv22 01/16] mm: page_alloc: remove trailing whitespace Marek Szyprowski
2012-02-17 19:30 ` [PATCHv22 02/16] mm: compaction: introduce isolate_migratepages_range() Marek Szyprowski
2012-02-17 19:30 ` [PATCHv22 03/16] mm: compaction: introduce map_pages() Marek Szyprowski
2012-02-17 19:30 ` [PATCHv22 04/16] mm: compaction: introduce isolate_freepages_range() Marek Szyprowski
2012-02-17 19:30 ` [PATCHv22 05/16] mm: compaction: export some of the functions Marek Szyprowski
2012-02-17 19:30 ` [PATCHv22 06/16] mm: page_alloc: introduce alloc_contig_range() Marek Szyprowski
2012-02-17 19:30 ` [PATCHv22 07/16] mm: page_alloc: change fallbacks array handling Marek Szyprowski
2012-02-17 19:30 ` [PATCHv22 08/16] mm: mmzone: MIGRATE_CMA migration type added Marek Szyprowski
2012-02-17 19:30 ` [PATCHv22 09/16] mm: page_isolation: MIGRATE_CMA isolation functions added Marek Szyprowski
2012-02-17 19:30 ` [PATCHv22 10/16] mm: Serialize access to min_free_kbytes Marek Szyprowski
2012-02-17 19:30 ` [PATCHv22 11/16] mm: extract reclaim code from __alloc_pages_direct_reclaim() Marek Szyprowski
2012-02-17 19:30 ` [PATCHv22 12/16] mm: trigger page reclaim in alloc_contig_range() to stabilise watermarks Marek Szyprowski
2012-02-17 19:30 ` [PATCHv22 13/16] drivers: add Contiguous Memory Allocator Marek Szyprowski
2012-02-21 21:30 ` Aaro Koskinen
2012-02-22 16:26 ` Marek Szyprowski
2012-02-17 19:30 ` [PATCHv22 14/16] X86: integrate CMA with DMA-mapping subsystem Marek Szyprowski
2012-02-22 0:18 ` Andrew Morton
2012-02-22 9:09 ` Russell King - ARM Linux
2012-02-22 13:36 ` Arnd Bergmann [this message]
2012-02-22 16:36 ` Marek Szyprowski
2012-02-17 19:30 ` [PATCHv22 15/16] ARM: " Marek Szyprowski
2012-02-17 19:30 ` [PATCHv22 16/16] ARM: Samsung: use CMA for 2 memory banks for s5p-mfc device Marek Szyprowski
2012-02-18 0:23 ` [PATCHv22 00/16] Contiguous Memory Allocator Anca Emanuel
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