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

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Message-Id: <20090120.161626.93641145.davem@davemloft.net>
Date:	Tue, 20 Jan 2009 16:16:26 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	jaswinder@...nel.org
Cc:	mingo@...e.hu, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: Confusion in usr/include/asm-generic/fcntl.h

From: Jaswinder Singh Rajput <jaswinder@...nel.org>
Date: Wed, 21 Jan 2009 05:34:17 +0530

> usr/include/asm-generic/fcntl.h is giving 2 'make headers_check' warnings:
>  usr/include/asm-generic/fcntl.h:127: leaks CONFIG_64BIT to userspace where it is not valid
>  usr/include/asm-generic/fcntl.h:149: leaks CONFIG_64BIT to userspace where it is not valid
> 
> usr/include/asm-generic/fcntl.h:
...
> #ifndef CONFIG_64BIT will always be true for userspace. So what is the use of #ifndef CONFIG_64BIT ?

Good catch.

This file needs to test for 64-bit'ness using some non-CONFIG_*
test.  And the standard built-in CPP macros which can be used
to check for that are different on every platform.
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