linux-kernel - Re: [RFC] x86: merge nmi

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Date:	Sat, 17 May 2008 21:52:27 +0100 (BST)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Tom Spink <tspink@...il.com>
cc:	Cyrill Gorcunov <gorcunov@...il.com>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Slaby <jirislaby@...il.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [RFC] x86: merge nmi_32-64 to nmi.c

On Sat, 17 May 2008, Tom Spink wrote:

> static inline unsigned int get_nmi_count(int cpu)
> {
> #ifdef CONFIG_X86_64
>         return cpu_pda(cpu)->__nmi_count;
> #else
>         return nmi_count(cpu);
> #endif
> }
> 
> I know it introduces a lot of these conditionals, but at least there
> is one place to look for the get_nmi_count function, instead of
> searching for all variants of the function.

 Well, I suppose some header should provide a definition like:

#ifdef CONFIG_X86_64
#define cpu_x86_64 1
#else
#define cpu_x86_64 0
#endif

and the you can remove the horrible #ifdef clutter and make the quoted 
function look like:

static inline unsigned int get_nmi_count(int cpu)
{
	return cpu_x86_64 ? cpu_pda(cpu)->__nmi_count : nmi_count(cpu);
}

Much better -- isn't it?

  Maciej
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