linux-kernel - Re: [RFC] asm-generic/{unistd,types,posix

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Message-ID: <49D3DABA.2050001@zytor.com>
Date:	Wed, 01 Apr 2009 14:20:58 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Will Newton <will.newton@...il.com>,
	Geert Uytterhoeven <geert.uytterhoeven@...il.com>,
	michal.simek@...alogix.com,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linux-arch@...r.kernel.org, linux-api@...r.kernel.org,
	Chen Liqin <liqin.chen@...plusct.com>
Subject: Re: [RFC] asm-generic/{unistd,types,posix_types}.h for new arch

Arnd Bergmann wrote:
> 
> Unfortunately, there is no generic way to detect the word size yet,
> but every architecture uses its own preprocessor macro (__x86_64__,
> __s390x__, __ppc64__). We also can't use CONFIG_64BIT in an user-exported
> interface header file, because the use space can also be compiled for
> 32 bits when the kernel uses 64 bits.
> 

Actually, gcc does have the _LP64 and __SIZEOF_POINTER__ macros (as well 
as __CHAR_BIT__), although I don't know how far back it does have that. 
     If it has been with us for long enough it might be possible to 
switch over to using panarch macros.

	-hpa

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