linux-kernel - Re: [PATCH 10/11] ST SPEAr: Added default configuration files for SPEAr machines

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Date:	Thu, 11 Mar 2010 20:26:03 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Linus Walleij <linus.ml.walleij@...il.com>
Cc:	Viresh KUMAR <viresh.kumar@...com>, rajeev-dlh.kumar@...com,
	shiraz.hashim@...com, armando.visconti@...com,
	ashish.priyadarshi@...com, linux-kernel@...r.kernel.org,
	vipin.kumar@...com, amit.goel@...com, deepak.sikri@...com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 10/11] ST SPEAr: Added default configuration files for
	SPEAr machines

On Thu, Mar 11, 2010 at 09:18:40PM +0100, Linus Walleij wrote:
> 2010/3/3 Viresh KUMAR <viresh.kumar@...com>:
> > (...)
> > +CONFIG_HAVE_GENERIC_DMA_COHERENT=y
> 
> Not specifically related to this defconfig because hundreds of defconfigs
> use this, but HAVE_GENERIC_DMA_COHERENT is not used in anything but
> a few Kconfig files, all just defining it. No single Makefile, #ifdef
> or anything
> else seems to be using this, so what is it for?? I can't find any use even if I
> go back to kernel 2.6.11 on LXR.

Err...

drivers/base/Makefile:obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o

include/asm-generic/dma-coherent.h:#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT

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