Messages in this thread Patch in this message | | | Subject | [PATCH] add write_seqlock to cpufreq change notifier for TSC | From | Stephen Hemminger <> | Date | 18 Mar 2003 15:00:18 -0800 |
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The CPU frequency change detection code can change the values used to compute time of day with TSC; but there was no locking around it.
--- timer_tsc.c.orig 2003-03-18 14:52:25.000000000 -0800 +++ timer_tsc.c 2003-03-18 14:55:13.000000000 -0800 @@ -213,6 +213,7 @@ { struct cpufreq_freqs *freq = data; + write_seqlock(&xtime_lock); if (!ref_freq) { ref_freq = freq->old; loops_per_jiffy_ref = cpu_data[freq->cpu].loops_per_jiffy; @@ -232,6 +233,7 @@ } #endif } + write_sequnlock(&xtime_lock); return 0; }
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