Author: jkim
Date: Tue Mar 15 19:47:20 2011
New Revision: 219676
URL: http://svn.freebsd.org/changeset/base/219676
Log:
Do not let machdep.tsc_freq modify tsc_freq itself. It is bad for i386 as
it does not operate atomically. Actually, it serves no purpose.
Noticed by: bde
Modified:
head/sys/x86/x86/tsc.c
Modified: head/sys/x86/x86/tsc.c
==============================================================================
--- head/sys/x86/x86/tsc.c Tue Mar 15 18:09:29 2011 (r219675)
+++ head/sys/x86/x86/tsc.c Tue Mar 15 19:47:20 2011 (r219676)
@@ -263,12 +263,10 @@ sysctl_machdep_tsc_freq(SYSCTL_HANDLER_A
if (tsc_timecounter.tc_frequency == 0)
return (EOPNOTSUPP);
- freq = tsc_freq;
+ freq = tsc_timecounter.tc_frequency;
error = sysctl_handle_64(oidp, &freq, 0, req);
- if (error == 0 && req->newptr != NULL) {
- tsc_freq = freq;
- tsc_timecounter.tc_frequency = tsc_freq;
- }
+ if (error == 0 && req->newptr != NULL)
+ tsc_timecounter.tc_frequency = freq;
return (error);
}
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