[PATCH] i386: remove xtime_lock'ing around cpufreq notifier
The locking of the xtime_lock around the cpu notifier is unessesary now. At one time the tsc was used after a frequency change for timekeeping, but the re-write of timekeeping no longer uses the TSC unless the frequency is constant. The variables that are changed in this section of code had also once been used for timekeeping, but not any longer .. Signed-off-by: Daniel Walker <dwalker@mvista.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Andi Kleen <ak@suse.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: john stultz <johnstul@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -200,13 +200,10 @@ time_cpufreq_notifier(struct notifier_block *nb, unsigned long val, void *data)
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{
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struct cpufreq_freqs *freq = data;
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if (val != CPUFREQ_RESUMECHANGE && val != CPUFREQ_SUSPENDCHANGE)
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write_seqlock_irq(&xtime_lock);
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if (!ref_freq) {
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if (!freq->old){
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ref_freq = freq->new;
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goto end;
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return 0;
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}
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ref_freq = freq->old;
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loops_per_jiffy_ref = cpu_data[freq->cpu].loops_per_jiffy;
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@ -237,9 +234,6 @@ time_cpufreq_notifier(struct notifier_block *nb, unsigned long val, void *data)
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}
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}
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}
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end:
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if (val != CPUFREQ_RESUMECHANGE && val != CPUFREQ_SUSPENDCHANGE)
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write_sequnlock_irq(&xtime_lock);
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return 0;
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}
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