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[PATCH] fix cpu frequency detection in arch/i386/kernel/timers/timer_tsc.c::recalibrate_cpu_khz() 

When we re-calibrate the frequency, it is likely that an interrupt (as for
example the main system clock) will be triggered by the system.  Therefore
the calibration may not be accurate.  This will also provide a fix to bug
#5266.

Many thanks to Larry Finger for helping resolving this issue.

Signed-off-by: Bruno Ducrot <ducrot@poupinou.org>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Larry Finger 2006-01-06 00:12:17 -08:00 committed by Linus Torvalds
parent 3841b0a173
commit bcf0f0d233
1 changed files with 2 additions and 0 deletions
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2
arch/i386/kernel/timers/timer_tsc.c
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@ -330,7 +330,9 @@ int recalibrate_cpu_khz(void)
unsigned int cpu_khz_old = cpu_khz; unsigned int cpu_khz_old = cpu_khz;
if (cpu_has_tsc) { if (cpu_has_tsc) {
local_irq_disable();
init_cpu_khz(); init_cpu_khz();
local_irq_enable();
cpu_data[0].loops_per_jiffy = cpu_data[0].loops_per_jiffy =
cpufreq_scale(cpu_data[0].loops_per_jiffy, cpufreq_scale(cpu_data[0].loops_per_jiffy,
cpu_khz_old, cpu_khz_old,