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

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Date:	Wed, 23 Mar 2011 16:30:31 +0800
From:	"Guan Xuetao" <gxt@...c.pku.edu.cn>
To:	"'Stephen Boyd'" <sboyd@...eaurora.org>
Cc:	"'Russell King - ARM Linux'" <linux@....linux.org.uk>,
	<linux-arm-kernel@...ts.infradead.org>,
	"'Arnd Bergmann'" <arnd@...db.de>, <linux-kernel@...r.kernel.org>,
	"'Sam Ravnborg'" <sam@...nborg.org>
Subject: RE: [PATCH] ARM: Use asm-generic/sizes.h



> -----Original Message-----
> From: Stephen Boyd [mailto:sboyd@...eaurora.org]
> Sent: Wednesday, March 23, 2011 11:17 AM
> To: Guan Xuetao
> Cc: 'Russell King - ARM Linux'; linux-arm-kernel@...ts.infradead.org; 'Arnd Bergmann'; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH] ARM: Use asm-generic/sizes.h
> 
> On 03/22/2011 06:29 PM, Guan Xuetao wrote:
> >> -----Original Message-----
> >> From: Stephen Boyd [mailto:sboyd@...eaurora.org]
> >> Sent: Wednesday, March 23, 2011 2:40 AM
> >> To: Guan Xuetao
> >> Cc: 'Arnd Bergmann'; linux-arm-kernel@...ts.infradead.org; 'Russell King - ARM Linux'; linux-kernel@...r.kernel.org
> >> Subject: Re: [PATCH] ARM: Use asm-generic/sizes.h
> >> Ah, I didn't notice this part. SZ_48M is actually used by ARM code so
> >> that would need to be added to the generic header should we go with this
> >> patch.
> > 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?
No.
I just think that power-of-2 sizes are more generic, not compulsively of course.

Sam Ravnborg had introduced a patch set to provide generic support for
architectures that using one-line asm-generic headers.

CC: Sam Ravnborg <sam@...nborg.org>

> 
> Note: SH could also move to this if SZ_26M is put in the generic header.
> 
> --
> Sent by an employee of the Qualcomm Innovation Center, Inc.
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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