linux-kernel - Re: asm-x86/* exported headers using CONFIG_X86

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Date:	Tue, 16 Oct 2007 01:01:53 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Arnd Bergmann <arnd@...db.de>
cc:	linux-kernel@...r.kernel.org, Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: asm-x86/* exported headers using CONFIG_X86_32

On Tue, 16 Oct 2007, Arnd Bergmann wrote:
> While looking through the new header files, I noticed lots of occurences
> of #ifdef CONFIG_X86_32 in headers files exported for glibc.
> 
> This is fundamentally broken because user applications including them
> do not know about any CONFIG_* symbols, and if they did, those
> would incorrectly describe the ABI.
> 
> I guess in most cases, the headers that are interesting to user space
> can simply be merged without any such #ifdef remaining, but those
> that are still needed should be converted to use #ifdef __x86_64__,
> which is set by the compiler.
> This is how the other architectures avoid this particular problem.

Yup, they slipped through. I have fixups in my pile already. Will send
them tomorrow when I'm actually awake.

     tglx

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