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

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Date:	Mon, 17 Feb 2014 10:18:40 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	Alexander Shiyan <shc_work@...l.ru>,
	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

On Mon, Feb 17, 2014 at 10:02:48AM +0100, Paul Bolle wrote:
> On Mon, 2014-02-17 at 08:43 +0400, Alexander Shiyan wrote:
> > 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.

No. Have a look at arch/arm/tools/mach-types:

mxlads                  MACH_MXLADS             MXLADS	1851
mx1ads                  ARCH_MX1ADS             MX1ADS  160

And what gen-mach-types makes from it:

#ifdef CONFIG_MACH_MXLADS
# ifdef machine_arch_type
#  undef machine_arch_type
#  define machine_arch_type     __machine_arch_type
# else
#  define machine_arch_type     MACH_TYPE_MXLADS
# endif
# define machine_is_mxlads()    (machine_arch_type == MACH_TYPE_MXLADS)
#else
# define machine_is_mxlads()    (0)
#endif

#ifdef CONFIG_ARCH_MX1ADS
# ifdef machine_arch_type
#  undef machine_arch_type
#  define machine_arch_type     __machine_arch_type
# else
#  define machine_arch_type     MACH_TYPE_MX1ADS
# endif
# define machine_is_mx1ads()    (machine_arch_type == MACH_TYPE_MX1ADS)
#else
# define machine_is_mx1ads()    (0)
#endif

So machine_is_mx1ads() can only ever evaluate to true when
CONFIG_ARCH_MX1ADS is set and machine_is_mxlads() can only evaluate to true
when CONFIG_MACH_MXLADS is set.

Whether to use ARCH or MACH simply depends on what Russell has in the
machine registry database for a given board.

Sascha

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