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

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Date:	Tue, 24 Jun 2008 01:21:49 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Alok Kataria <akataria@...are.com>
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


* 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)

	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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