linux-kernel - Re: [PATCH] ARM: Use asm-generic/sizes.h

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Date:	Wed, 23 Mar 2011 13:07:04 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Guan Xuetao <gxt@...c.pku.edu.cn>,
	"'Russell King - ARM Linux'" <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org,
	"'Arnd Bergmann'" <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: Use asm-generic/sizes.h

On Tue, Mar 22, 2011 at 08:16:38PM -0700, Stephen Boyd wrote:
> On 03/22/2011 06:29 PM, Guan Xuetao wrote:
> > IMO, the content of asm-generic/sizes.h should only include
> > power-of-2 sizes definitions.  And SZ_48M could be replaced by
> > (SZ_32M | SZ_16M) or (SZ_32M + SZ_16M), or added to arch-specific
> > headers.
> 
> I'm hoping that kbuild gets asm-generic support sometime soon so files
> with only a "#include <asm-generic/*>" are generated instead of living
> in the tree. In that case I'd rather have the non power of 2 constants
> added to the generic sizes.h and be done with it. There isn't any strong
> technical reason to deny power of 2 constants from the generic header,
> right?
> 
> Note: SH could also move to this if SZ_26M is put in the generic header.
> 
I since dropped it and just open-coded it in the one place it was being
used. If it had been used in more places I would have stubbed it in the
asm/ version after the asm-generic include.

I'd say the simplest is to stay with powers of 2 unless you have a size
that is used in more than one place. If ARM uses SZ_48M commonly then
there's certainly a good case for adding it generically.
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