From: Russell King <rmk+lkml@arm.linux.org.uk>
To: James Bottomley <James.Bottomley@SteelEye.com>
Cc: Ralf Baechle <ralf@linux-mips.org>, Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: Re: [PATCH] Kill dma_is_consistent()
Date: Thu, 23 Nov 2006 16:06:17 +0000 [thread overview]
Message-ID: <20061123160617.GC8984@flint.arm.linux.org.uk> (raw)
In-Reply-To: <1164297574.2829.9.camel@mulgrave.il.steeleye.com>
On Thu, Nov 23, 2006 at 09:59:33AM -0600, James Bottomley wrote:
> On Thu, 2006-11-23 at 15:03 +0000, Ralf Baechle wrote:
> > dma_is_consistent() is ill-designed in that it does not have a struct device
> > argument which makes proper support for systems that consist of a mix of
> > coherent and non-coherent DMA devices hard.
>
> At the time the interface was designed, the general consensus was that
> it was easier to recognise incoherent memory regions by their address
> range than by which device they came from. The main proponent of this
> being arm, if I remember rightly.
I don't remember that being particularly discussed, and it seems that
no one has implemented it (but possibly implemented their own stuff
in arch private code.)
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of:
next prev parent reply other threads:[~2006-11-23 16:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-23 15:03 [PATCH] Kill dma_is_consistent() Ralf Baechle
2006-11-23 15:59 ` James Bottomley
2006-11-23 16:06 ` Russell King [this message]
2006-11-23 17:24 ` [PATCH] Add struct dev pointer to dma_is_consistent() Ralf Baechle
-- strict thread matches above, loose matches on Subject: below --
2006-11-23 15:04 [PATCH] Kill dma_is_consistent() Ralf Baechle
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