linux-kernel - Re: [RFC PATCH] x86:Use cpu_khz for loops_per

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Date:	Mon, 23 Jun 2008 16:34:30 -0700
From:	Alok Kataria <akataria@...are.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Daniel Hecht <dhecht@...are.com>, Tim Mann <mann@...are.com>,
	Zach Amsden <zach@...are.com>, Sahil Rihan <srihan@...are.com>
Subject: Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculation

On Mon, 2008-06-23 at 16:21 -0700, Ingo Molnar wrote:
> * Alok Kataria <akataria@...are.com> wrote:
> 
> > +     lpj = ((u64)tsc_khz * 1000);
> > +     do_div(lpj, HZ);
> > +     lpj_tsc = lpj;
> 
> this needed the fix below.
> 
> but there's another problem as well: why are generic files
> (init/calibrate.c and include/linux/delay.h) using something that is
> named in an x86-specific way - lpj_tsc ? (TSC is an x86 concept)
> 

calibrate_delay_direct was using some variables with "tsc" as the prefix
(tsc_rate_min/max) ...so i thought of using lpj_tsc. And also IMO,
lpj_tsc explains how is this variable initialized. But thinking about
it, maybe we should rename it to "lpj_timer" ?

Also, i still haven't got to testing today's tip tree in my environment,
will let you know as soon as i have done it. 

Thanks,
Alok
>         Ingo
> 
> ------------>
> commit 5cd5a41ea6f4363b03156e2208dd0d2266f0d67d
> Author: Ingo Molnar <mingo@...e.hu>
> Date:   Tue Jun 24 01:19:49 2008 +0200
> 
>     x86: fix "x86: use cpu_khz for loops_per_jiffy calculation"
> 
>     fix:
> 
>     arch/x86/kernel/tsc_32.c: In function ‘tsc_init':
>     arch/x86/kernel/tsc_32.c:421: error: ‘lpj_tsc' undeclared (first use in this function)
>     arch/x86/kernel/tsc_32.c:421: error: (Each undeclared identifier is reported only once
>     arch/x86/kernel/tsc_32.c:421: error: for each function it appears in.)
> 
>     Signed-off-by: Ingo Molnar <mingo@...e.hu>
> 
> diff --git a/arch/x86/kernel/tsc_32.c b/arch/x86/kernel/tsc_32.c
> index 4adac0d..bfb9193 100644
> --- a/arch/x86/kernel/tsc_32.c
> +++ b/arch/x86/kernel/tsc_32.c
> @@ -1,6 +1,7 @@
>  #include <linux/sched.h>
>  #include <linux/clocksource.h>
>  #include <linux/workqueue.h>
> +#include <linux/delay.h>
>  #include <linux/cpufreq.h>
>  #include <linux/jiffies.h>
>  #include <linux/init.h>

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