linux-kernel - Re: [PATCH] arm: imx: remove MACH

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Date:	Mon, 17 Feb 2014 08:43:07 +0400
From:	Alexander Shiyan <shc_work@...l.ru>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	Russell King <linux@....linux.org.uk>,
	Richard Weinberger <richard@....at>,
	linux-kernel@...r.kernel.org,
	Sascha Hauer <kernel@...gutronix.de>,
	Shawn Guo <shawn.guo@...aro.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm: imx: remove MACH_MXLADS

Воскресенье, 16 февраля 2014, 21:35 +01:00 от Paul Bolle <pebolle@...cali.nl>:
> On Sun, 2014-02-16 at 23:21 +0400, Alexander Shiyan wrote:
> > Воскресенье, 16 февраля 2014, 20:12 +01:00 от Paul Bolle
> <pebolle@...cali.nl>:
> > > On Sun, 2014-02-16 at 23:06 +0400, Alexander Shiyan wrote:
> > > > Kconfig selects MACH_MXLADS, this enables machine_arch_type
> > > > from include/generated/mach-types.h which used for machine_is_xx()
> macro,
> > > > so if multiple boards is defined in the kernel, this cause to incorrect
> > > matching.
> > > 
> > > But, as I stated in the commit explanation, there are no users of
> > > machine_is_mxlads().
> > 
> > If you have MXLADS and FOO boards support in the kernel (for example)
> > and you want to start MXLADS version, your machine_is_FOO() will be
> positive,
> > since machine_arch_type will be constant value FOO in this case.
> 
> I think it might be helpful - for people trying to understand this
> thread - to add a quote from https://lkml.org/lkml/2013/3/8/473 :
> So, the result is that:
> - de-selected platforms have their if (machine_is_xxx()) { } optimised
> out of the kernel.
> - for a kernel built targetting one platform, all the
> if (machine_is_xxx()) tests are optimised away, leaving only the
> relevant code behind.
> - otherwise, we get the _appropriate_ conditional code for the
> configuration generated.
> 
> Back to the issue at hand: without my patch ARCH_MX1ADS selects
> MACH_MXLADS. So it seems in this case people will have to select
> ARCH_MX1ADS besides selecting FOO. Wouldn't that solve this problem?
> Note that the MACH_MXLADS is now basically meant to be selected by
> ARCH_MX1ADS and not set directly anyway.

It seems that even in the current state, Kconfig for i.MX contains an error.
As a start, we should rename ARCH_MX1ADS to MACH_MX1ADS first.

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