Re: [2.6 patch] kill include/linux/platform.h

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Date:	Mon, 3 Oct 2005 23:50:53 +0200
To: Tony Luck <tony.luck@gmail.com>

On Mon, Oct 03, 2005 at 02:07:12PM -0700, Tony Luck wrote:
> > The default_idle() prototype should stay inside some header file.
>
> That would be best, yes.
>
> > @Patrick:
> > Any suggestion where it should move to?
>
> Of the include files already included directly by arch/ia64/kernel/setup.c,
> <linux/sched.h> looks the most promising. There's lots of .*idle.* things
> already in there.
>
> Looking at existing precedent: ppc64 has a definition of default_idle()
> in <asm/machdep.h>

The question whether linux/ or asm/ is the best place for the definition
boils down to the question whether it is expected that default_idle() is
present on all architectures or whether it's an architecture-specific
implementation detail.

In the first case, I'm surprised that there is no platform independent
code using it.

In the second case, it seems we can kill the default_idle() functions on
mips (empty) and parisk.

> i396, cris and um already have gone along the route of adding extern
> definitions for default_idle() to ".c" files ... so cleanup creates more
> opportunities for cleanup (but you are probably very experienced in
> this phenomenom :-)

I stumbled across the question whether include/linux/platform.h is still
required by cleaning up warnings with the -Wmissing-prototypes compiler
flag I plan to add to the kernel CFLAGS soon that generates warnings
for such extern constructs...

> -Tony

cu
Adrian

-- 
       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed
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