linux-kernel - Re: [PATCH] x86: traps.c declare functions before they get used

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Date:	Thu, 18 Dec 2008 15:33:35 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jaswinder Singh <jaswinderlinux@...il.com>
Cc:	Jaswinder Singh <jaswinder@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH] x86: traps.c declare functions before they get used


* Jaswinder Singh <jaswinderlinux@...il.com> wrote:

> Hello Ingo,
> 
> On Wed, Dec 17, 2008 at 1:49 AM, Ingo Molnar <mingo@...e.hu> wrote:
> >> +#ifndef CONFIG_MATH_EMULATION
> >>  asmlinkage void math_emulate(long);
> >>  #endif
> >
> > uhm, shouldnt that #ifndef CONFIG_MATH_EMULATION be #ifdef
> > CONFIG_MATH_EMULATION?
> >
> 
> Sorry, but it seems correct to me in traps case will be opposite.
> 
> If someone tries to access math_emulate() and MATH_EMULATION is not 
> defined then he will be trapped ;-)

you should build-test your patch with MATH_EMULATION enabled.

	Ingo
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