linux-kernel - Re: Confusion in usr/include/asm-generic/fcntl.h

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Date:	Wed, 21 Jan 2009 16:46:11 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	John David Anglin <dave@...uly1.hia.nrc.ca>
CC:	Grant Grundler <grundler@...isc-linux.org>, arnd@...db.de,
	davem@...emloft.net, jaswinder@...nel.org, mingo@...e.hu,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	linux-parisc@...r.kernel.org
Subject: Re: Confusion in usr/include/asm-generic/fcntl.h

John David Anglin wrote:
>>> CONFIG_64BIT on parisc user space looks very wrong.
>> This shouldn't be exported to user space. Is that what you meant?
> 
> This does get exported to user space as applications sometimes need
> to know whether they are running under a 32 or 64-bit kernel.  See
> config.guess.  However, it certainly would be wrong to use this
> to make decisions about user space.
> 

CONFIG_* macros are not (or at least should not) be exported to 
userspace!  Userspace should not make compile-time decisions based on 
kernel configuration -- a runtime property!

	-hpa

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