linux-kernel - Re: [PATCH] do not export kernel's NULL #define to userspace

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Message-Id: <201203211417.14306.arnd@arndb.de>
Date:	Wed, 21 Mar 2012 14:17:14 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Lubos Lunak <l.lunak@...e.cz>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] do not export kernel's NULL #define to userspace

On Wednesday 21 March 2012, Lubos Lunak wrote:
> > If so, we might have to replace it with a __KERNEL_NULL constant
> > or something, like we do for the stuff in linux/types.h, so we
> > don't accidentally break user applications that rely on the
> > header files to be self-contained.
> >
> > I think there is at least a NULL usage in linux/wireless.h and some
> > netfilter headers.
> 
>  I see. How about the attached patch then?

Strictly speaking, you should not include standard headers from kernel
provided headers, and the problems would be similar to those before
your patch: anyone who currently doesn't include <stddef.h> but has
their own definition of NULL will still get a conflict from including
a kernel header that includes <linux/stddef.h>.

	Arnd
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