From: Arnd Bergmann <arnd@arndb.de>
To: Tejun Heo <htejun@gmail.com>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>,
hancockrwd@gmail.com, alan@lxorguk.ukuu.org.uk,
flar@allandria.com, schmitz@biophys.uni-duesseldorf.de,
linux-kernel@vger.kernel.org, jgarzik@pobox.com,
linux-ide@vger.kernel.org, takata@linux-m32r.org,
geert@linux-m68k.org, linux-m68k@vger.kernel.org,
ysato@users.sourceforge.jp
Subject: Re: [PATCH] ata: libata depends on HAS_DMA
Date: Fri, 15 May 2009 13:16:30 +0200 [thread overview]
Message-ID: <200905151316.31521.arnd@arndb.de> (raw)
In-Reply-To: <4A0CFE1F.5080409@gmail.com>
On Friday 15 May 2009, Tejun Heo wrote:
> FUJITA Tomonori wrote:
> > Can libata call dma_supported() per device to decide DMA or PIO mode?
> > Then, we can solve this problem by add dummy DMA API (just calls BUG)
> > on such architectures, without Kconfig magic or adding ifdef (like the
> > old ide stack does), I think.
That would be the !CONFIG_PCI half of the old
include/asm-generic/dma-mapping.h file that you just removed,
right?
In general, I'd prefer keeping the asm-generic/dma-mapping-broken.h
implementation that gives us a compile-time error, but maybe there
is an even better option based on the mn10300 implementation which
basically pretends everything works with just page_to_phys() mappings.
> Sure it can. Which specific drivers are we talking about?
The main problem is libata-core.c, which references DMA mapping
API calls that are only implemented on architectures setting
CONFIG_HAS_DMA.
Arnd <><
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next prev parent reply other threads:[~2009-05-15 11:16 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20090511222702.352192505@arndb.de>
2009-05-11 22:38 ` [PATCH] ata: libata depends on HAS_DMA Arnd Bergmann
2009-05-12 0:58 ` Jeff Garzik
2009-05-12 12:40 ` Arnd Bergmann
2009-05-12 13:05 ` Arnd Bergmann
2009-05-12 8:06 ` Alan Cox
2009-05-12 9:23 ` Arnd Bergmann
2009-05-13 3:30 ` Brad Boyer
2009-05-13 4:12 ` Michael Schmitz
2009-05-13 4:34 ` Brad Boyer
2009-05-13 8:51 ` Alan Cox
2009-05-13 8:55 ` Geert Uytterhoeven
2009-05-13 23:57 ` Robert Hancock
2009-05-14 0:18 ` FUJITA Tomonori
2009-05-15 5:31 ` Tejun Heo
2009-05-15 11:16 ` Arnd Bergmann [this message]
2009-05-15 11:21 ` Tejun Heo
2009-05-15 11:55 ` Arnd Bergmann
2009-05-17 9:00 ` Robert Hancock
2009-05-17 19:38 ` Arnd Bergmann
2009-05-17 20:05 ` Jeff Garzik
2009-05-17 22:45 ` [PATCH] asm-generic: add a dma-mapping.h file Arnd Bergmann
2009-05-18 6:03 ` Geert Uytterhoeven
2009-05-18 8:28 ` Arnd Bergmann
2009-05-18 10:45 ` FUJITA Tomonori
2009-05-18 14:45 ` Arnd Bergmann
2009-05-18 22:44 ` FUJITA Tomonori
2009-05-19 16:22 ` Arnd Bergmann
2009-05-19 17:01 ` Grant Grundler
2009-05-19 17:40 ` Arnd Bergmann
2009-05-19 18:08 ` Grant Grundler
2009-05-22 12:12 ` FUJITA Tomonori
2009-05-22 14:07 ` Arnd Bergmann
2009-05-22 14:38 ` FUJITA Tomonori
2009-05-22 15:05 ` Arnd Bergmann
2009-05-26 4:36 ` FUJITA Tomonori
2009-05-18 22:54 ` Jeff Garzik
2009-05-18 23:22 ` FUJITA Tomonori
2009-05-18 10:45 ` [PATCH] ata: libata depends on HAS_DMA FUJITA Tomonori
2009-05-13 10:39 ` Arnd Bergmann
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