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authorDaniel Walker <dwalker@mvista.com>2007-05-02 13:27:18 -0400
committerAndi Kleen <andi@basil.nowhere.org>2007-05-02 13:27:18 -0400
commitdf3624aa293dfa2d46089747d919711089a702eb (patch)
tree548cd81bdec5ec348d744fa9b6767e8e2ed030db /arch/i386/kernel/tsc.c
parent62918a036148230ba1ad175dc8a0952e3752ac57 (diff)
[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>
Diffstat (limited to 'arch/i386/kernel/tsc.c')
-rw-r--r--arch/i386/kernel/tsc.c8
1 files changed, 1 insertions, 7 deletions
diff --git a/arch/i386/kernel/tsc.c b/arch/i386/kernel/tsc.c
index 755209dc93e..f64b81f3033 100644
--- a/arch/i386/kernel/tsc.c
+++ b/arch/i386/kernel/tsc.c
@@ -200,13 +200,10 @@ time_cpufreq_notifier(struct notifier_block *nb, unsigned long val, void *data)
200{ 200{
201 struct cpufreq_freqs *freq = data; 201 struct cpufreq_freqs *freq = data;
202 202
203 if (val != CPUFREQ_RESUMECHANGE && val != CPUFREQ_SUSPENDCHANGE)
204 write_seqlock_irq(&xtime_lock);
205
206 if (!ref_freq) { 203 if (!ref_freq) {
207 if (!freq->old){ 204 if (!freq->old){
208 ref_freq = freq->new; 205 ref_freq = freq->new;
209 goto end; 206 return 0;
210 } 207 }
211 ref_freq = freq->old; 208 ref_freq = freq->old;
212 loops_per_jiffy_ref = cpu_data[freq->cpu].loops_per_jiffy; 209 loops_per_jiffy_ref = cpu_data[freq->cpu].loops_per_jiffy;
@@ -237,9 +234,6 @@ time_cpufreq_notifier(struct notifier_block *nb, unsigned long val, void *data)
237 } 234 }
238 } 235 }
239 } 236 }
240end:
241 if (val != CPUFREQ_RESUMECHANGE && val != CPUFREQ_SUSPENDCHANGE)
242 write_sequnlock_irq(&xtime_lock);
243 237
244 return 0; 238 return 0;
245} 239}