linux-kernel - Re: m68k Kconfig undefined symbol in 2.6.23.

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Date:	Thu, 11 Oct 2007 08:05:42 -0400 (EDT)
From:	"Robert P. J. Day" <rpjday@...dspring.com>
To:	Rob Landley <rob@...dley.net>
cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-kernel@...r.kernel.org
Subject: Re: m68k Kconfig undefined symbol in 2.6.23.

On Wed, 10 Oct 2007, Rob Landley wrote:

> The m68k Kconfig tries to select a symbol (APM_EMULATION) that doesn't exist.
>
> I did this to fix it, without really understanding the larger problem.  (Did
> APM go away?)  Just FYI...
>
> Rob
>
> diff -r 79f0ea1e0e70 drivers/macintosh/Kconfig
> --- a/drivers/macintosh/Kconfig	Tue Oct 09 21:00:40 2007 +0000
> +++ b/drivers/macintosh/Kconfig	Wed Oct 10 17:17:07 2007 -0500
> @@ -116,11 +116,6 @@ config PMAC_SMU
>  	  on the "SMU" system control chip which replaces the old PMU.
>  	  If you don't know, say Y.
>
> -config PMAC_APM_EMU
> -	tristate "APM emulation"
> -	select APM_EMULATION
> -	depends on ADB_PMU && PM && PPC32
> -
>  config PMAC_MEDIABAY
>  	bool "Support PowerBook hotswap media bay"
>  	depends on PPC_PMAC && PPC32

the obvious problem with the above is that APM_EMULATION is defined in
kernel/power/Kconfig arch-independently thusly:

config APM_EMULATION
        tristate "Advanced Power Management Emulation"
        depends on PM && SYS_SUPPORTS_APM_EMULATION
        help
        ... blah blah ...

but the Kconfig variable SYS_SUPPORTS_APM_EMULATION is defined for
only a small subset of architectures:

$ grep "config SYS_SUPPORTS_APM_EMULATION" $(find . -name Kconfig*)
./arch/mips/Kconfig:config SYS_SUPPORTS_APM_EMULATION
./arch/sh/Kconfig:config SYS_SUPPORTS_APM_EMULATION
./arch/arm/Kconfig:config SYS_SUPPORTS_APM_EMULATION
./arch/powerpc/Kconfig:config SYS_SUPPORTS_APM_EMULATION

  so there's a good chance that doing a kernel config with any other
arch than those listed above that supports PM is going to generate the
same warning.

rday
-- 
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

http://crashcourse.ca
========================================================================
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