linux-kernel - RE: [PATCH] asm-generic headers: modify stat.h in include/asm-generic to be applicable to more architectures

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Date:	Mon, 10 Jan 2011 21:58:02 +0800
From:	"Guan Xuetao" <guanxuetao@...c.pku.edu.cn>
To:	"'Arnd Bergmann'" <arnd@...db.de>
Cc:	<linux-arch@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] asm-generic headers: modify stat.h in include/asm-generic to be applicable to more architectures

IMO, asm-generic headers should be used in more architectures as far as possible.
The patch of stat.h could be split into two parts to discuss.
Firstly,  STAT64_HAS_BROKEN_ST_INO is defined in most architecture's asm/stat.h,
and it should be considered as the part in asm-generic/stat.h.
Secondly, STAT64_PAD_BEFORE_* are misunderstanding definitions, and perhaps
it should use STAT64_ST_SIZE_NEED_ALIGN_64.
Indeed, the macros are used for compatibility, but most architectures could make full use of
asm-generic headers, and new architectures could just follow the default values.

Guan Xuetao

> -----Original Message-----
> From: Arnd Bergmann [mailto:arnd@...db.de]
> Sent: Sunday, January 09, 2011 8:28 AM
> To: Guan Xuetao
> Cc: linux-arch@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH] asm-generic headers: modify stat.h in include/asm-generic to be applicable to more architectures
> 
> On Saturday 08 January 2011, Guan Xuetao wrote:
> > From: Guan Xuetao <guanxuetao@...c.pku.edu.cn>
> >
> >  This patch modifies stat.h in include/asm-generic to be applicable to more architectures.
> >  STAT64_HAS_BROKEN_ST_INO is defined in most architecture's asm/stat.h, and it need
> >  32-bit __st_ino member to be defined in different position of 64-bit st_ino member.
> >  STAT64_PAD_BEFORE_ST_SIZE is the pad before st_size member, with default value 8 bytes.
> >  STAT64_PAD_BEFORE_ST_BLOCKS is the pad before st_blocks member, with default value
> >  4 bytes to align the following member to 64-bit.
> 
> I'd prefer not to apply this patch. It makes the generic header
> significantly more complex, and I can't see a significant benefit.
> 
> The existing architectures would all still have to define the macros
> you test and also keep defining stuff like __old_kernel_stat, while
> risking to introduce bugs while changing to the common header. We've
> done similar tricks in other places, where the differences between
> architectures are smaller, but this one doesn't seem worth it
> unless we can get to the point where we can define struct stat in
> linux/stat.h for everyone and only do the macros for the architectures
> that need it.
> 
> 	Arnd

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