linux-kernel - Re: [PATCH 1/8 v3] DMA: PL330: use prefix in reg names to build under x86

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Date:	Wed, 28 Nov 2012 17:15:39 +0100
From:	Davide Ciminaghi <ciminaghi@...dd.com>
To:	Jassi Brar <jaswinder.singh@...aro.org>
Cc:	Alessandro Rubini <rubini@...dd.com>, viresh.linux@...il.com,
	giancarlo.asnaghi@...com, rajeev-dlh.kumar@...com,
	linux@....linux.org.uk, nico@...xnic.net, vinod.koul@...el.com,
	linus.walleij@...aro.org, hpa@...or.com,
	linux-kernel@...r.kernel.org, grant.likely@...retlab.ca,
	wim@...ana.be, mingo@...hat.com, ben-linux@...ff.org, djbw@...com,
	tglx@...utronix.de, cjb@...top.org,
	linux-arm-kernel@...ts.infradead.org, davidb@...eaurora.org
Subject: Re: [PATCH 1/8 v3] DMA: PL330: use prefix in reg names to build under x86

On Sat, Nov 24, 2012 at 04:35:37PM +0530, Jassi Brar wrote:
> On 24 November 2012 12:33, Alessandro Rubini <rubini@...dd.com> wrote:
> > My patch:
> >>> This driver would not compile if ARM_AMBA is selected under x86,
> >>> because "CS" and "DS" are already defined there.  But AMBA
> >>> is used in the x86 world by a PCI-to-AMBA bridge, to be submitted.
> >>>
> >>> The patch just adds the "PL330_" prefix to all register and bit fields,
> >>> so it can be built by randomconfig after ARM_AMBA appears within x86.
> >
> > Jassy Brar:
> >> Prefixing only CS and DS should be do the job.
> >> Why do we have to make every symbol noisy with PL330_ ?
> >
> > For internal consistency. I attacked this problem in July. This is
> > what you wrote:
> >
> >    I fully agree with your point and IIRC I always add some prefix to
> >    definitions in header files.
> >    Private defines in a .c file, without redundant prefixes, sounded like
> >    safe to me at the time, but perhaps I was wrong.
> >
> >    (references: http://lkml.org/lkml/2012/7/1/56)
> >
> > So I made the changes overall.  I dislike needless long patches, but
> > picking symbols to work around the conflict of the day while
> > introducing inconsistent naming doesn't look good to me.
> >
> Sorry if I gave the wrong impression. I didn't agree (and IIRC nobody
> suggested) we prefix _every_ symbol in the driver now. Just CS, DS, ES
> and maybe SA, DA, CC too for some consistency. IOW, only regs, not
> bit-fields.
>
Hi Jassi,

I've changed the patch to have registers only prefixed with PL300_ (no
prefix for bitfields).
Will send the new version in a few days (I'm still waiting for comments on
the other patches of the set).

Thanks and regards
Davide
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