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

David Miller
2009-01-21T00:16:39Z

From: Jaswinder Singh Rajput <jaswinder@kernel.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.