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x86: fix call to set_cyc2ns_scale() from time_cpufreq_notifier() 

In time_cpufreq_notifier() the cpu id to act upon is held in freq->cpu. Use it
instead of smp_processor_id() in the call to set_cyc2ns_scale().
This makes the preempt_*able() unnecessary and lets set_cyc2ns_scale() update
the intended cpu's cyc2ns.

Related mail/thread: http://lkml.org/lkml/2007/12/7/130

Signed-off-by: Karsten Wiese <fzu@wemgehoertderstaat.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Karsten Wiese 2008-04-07 12:14:45 +02:00 committed by Ingo Molnar
parent 5b13d86357
commit 4f41c94d5c
2 changed files with 2 additions and 6 deletions
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4
arch/x86/kernel/tsc_32.c
View File

@ -256,9 +256,7 @@ time_cpufreq_notifier(struct notifier_block *nb, unsigned long val, void *data)
ref_freq, freq->new);
if (!(freq->flags & CPUFREQ_CONST_LOOPS)) {
tsc_khz = cpu_khz;
preempt_disable();
set_cyc2ns_scale(cpu_khz, smp_processor_id());
preempt_enable();
set_cyc2ns_scale(cpu_khz, freq->cpu);
/*
* TSC based sched_clock turns
* to junk w/ cpufreq

4
arch/x86/kernel/tsc_64.c
View File

@ -148,9 +148,7 @@ static int time_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
mark_tsc_unstable("cpufreq changes");
}
preempt_disable();
set_cyc2ns_scale(tsc_khz_ref, smp_processor_id());
preempt_enable();
set_cyc2ns_scale(tsc_khz_ref, freq->cpu);
return 0;
}