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SubjectRe: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculation

* Alok Kataria <> 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)


commit 5cd5a41ea6f4363b03156e2208dd0d2266f0d67d
Author: Ingo Molnar <>
Date: Tue Jun 24 01:19:49 2008 +0200

x86: fix "x86: use cpu_khz for loops_per_jiffy calculation"


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 <>

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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