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

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Message-Id: <200901211313.17394.arnd@arndb.de>
Date:	Wed, 21 Jan 2009 13:13:16 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Helge Deller <deller@....de>, David Miller <davem@...emloft.net>,
	jaswinder@...nel.org, mingo@...e.hu, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-parisc@...r.kernel.org,
	Kyle McMartin <kyle@...artin.ca>
Subject: Re: Confusion in usr/include/asm-generic/fcntl.h

On Wednesday 21 January 2009, Sam Ravnborg wrote:
> Could we add a new symbol for this?
> We know we are going to use this in several places so a simpler variant
> would be more readable.
> 
> Something like:
> 
> #ifdef __64BIT
> ...
> #endif
> 
> When we define __64BIT we would use the  __BITS_PER_LONG == 64 check.

I would prefer using the __BITS_PER_LONG == 64 check directly, because
it gives you a warning when __BITS_PER_LONG is undefined, whereas the
#ifdef check gets easily fooled by include order problems. Note that
this is not a problem in the kernel for CONFIG_* symbols which are
always defined before the first #include.

	Arnd <><
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