linux-kernel - Re: [patch 8/9] Add time_update_mt

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Date:	Thu, 1 Feb 2007 12:28:50 +0100
From:	Andi Kleen <ak@...e.de>
To:	jbohac@...e.cz
Cc:	linux-kernel@...r.kernel.org, Vojtech Pavlik <vojtech@...e.cz>,
	ssouhlal@...ebsd.org, arjan@...radead.org, tglx@...utronix.de,
	johnstul@...ibm.com, zippel@...ux-m68k.org, andrea@...e.de
Subject: Re: [patch 8/9] Add time_update_mt_guess()

On Thursday 01 February 2007 11:00, jbohac@...e.cz wrote:

> Index: linux-2.6.20-rc5/arch/x86_64/kernel/apic.c
> ===================================================================
> --- linux-2.6.20-rc5.orig/arch/x86_64/kernel/apic.c
> +++ linux-2.6.20-rc5/arch/x86_64/kernel/apic.c
> @@ -63,6 +63,9 @@ int using_apic_timer __read_mostly = 0;
>  
>  static void apic_pm_activate(void);
>  
> +extern void time_update_mt_guess(void);

No externs in .c files


> +inline u64 mt_to_nsec(u64 mt)
> +{
> +	u64 ret;
> +	ret  = ((mt & 0xffffff) * vxtime.mt_q) >> 32;
> +	mt >>= 24;
> +	ret += ((mt & 0xffffff) * vxtime.mt_q) >> 8;
> +	mt >>= 24;
> +	ret += ( mt             * vxtime.mt_q) << 16;
> +	return ret;

Why so complicated? Isn't a single multiply good enough?

-Andi
-
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