linux-kernel - Re: [PATCH] Kill dma_is

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Message-ID: <20061123160617.GC8984@flint.arm.linux.org.uk>
Date:	Thu, 23 Nov 2006 16:06:17 +0000
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	James Bottomley <James.Bottomley@...elEye.com>
Cc:	Ralf Baechle <ralf@...ux-mips.org>, Andrew Morton <akpm@...l.org>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH] Kill dma_is_consistent()

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:
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