linux-kernel - Re: [PATCH V2 5/6] x86: add CONFIG_ARM

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Message-ID: <CACRpkdZLGhgpUJy_3QGYvGRqyxMkkPPSdyP==h5YurWqKnctBw@mail.gmail.com>
Date:	Sun, 5 Aug 2012 22:28:36 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Alim Akhtar <alim.akhtar@...il.com>,
	Kukjin Kim <kgene.kim@...sung.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Alessandro Rubini <rubini@...dd.com>, hpa@...or.com,
	linux-kernel@...r.kernel.org, giancarlo.asnaghi@...com,
	alan@...ux.intel.com, x86@...nel.org, gregkh@...uxfoundation.org,
	linux-arm-kernel@...ts.infradead.org, linux-serial@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH V2 5/6] x86: add CONFIG_ARM_AMBA, selected by STA2X11

On Tue, Jul 3, 2012 at 9:34 PM, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Tue, Jul 03, 2012 at 01:19:40PM +0000, Arnd Bergmann wrote:
>> On Tuesday 03 July 2012, Alessandro Rubini wrote:
>> >    drivers/dma/amba-pl08x.c: needs <asm/hardware/pl080.h>
>> >      proposed fix: move pl080.h to include/linux
>>
>> Note that there is already an include/linux/amba/pl08x.h.
>> I would just move the few parts of pl080.h that are actually
>> needed with global visibility there, and move the rest
>> to drivers/dma/.
>
> NAK.  It's the entire register definitions for the PL08x, which we really
> should not be exporting to common code.

The major reason why that file is there is that there is *another*
PL080 driver in arch/arm/mach-s3c64xx/dma.c which I repeatedly
asked the Samsung people to replace with the
drivers/dma/amba-pl08x.c driver. :-(

When I worked on the PL08x driver in drivers/dma I reused
this header to avoid code duplication.

Now that thing is stranding in the way. Alim, Kukjin, what's happening?

I feel tempted to update Alim's patch myself and push it on you
soon...

> Please wait until _after_ my DMA engine stuff (which is now in linux-next)
> makes its way upstream before touching any of this stuff, otherwise there's
> going to be conflicts.

That stuff is in now, looking real good. Good work on this!

> As part of my patch series, this gets rid of a number of uses of it in
> arch/arm, but there's still the .cctl_memcpy initializer which does. I've
> not yet checked whether all implementations use the same value (they
> probably do), and if so then it should be eliminated from platform code
> and moved into the driver.

Sounds like a plan. If we just get rid of the duplicate implementation
we're going somewhere.

Yours,
Linus Walleij
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