d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Remove duplicate cpufreq levels, i.e. ones that are within 25 Mhz of each

Browse Source 
other.  The first one survives, the rest are removed.  So far, it appears
only some acpi_perf(4) BIOS tables have these invalid states, but address
this in the core to be sure to handle other potential driver data.

PR:		kern/114722
Tested by:	stefan.lambrev / moneybookers.com
MFC after:	3 days
This commit is contained in:
Nate Lawson 2008-01-16 01:05:21 +00:00
parent c833fdd83f
commit e1f13773ec
1 changed files with 11 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
sys/kern/kern_cpu.c
View File

@ -606,6 +606,17 @@ cf_levels_method(device_t dev, struct cf_level *levels, int *count)
/* Finally, output the list of levels. */
i = 0;
TAILQ_FOREACH(lev, &sc->all_levels, link) {
/*
* Skip levels that are too close in frequency to the
* previous levels. Some systems report bogus duplicate
* settings (i.e., for acpi_perf).
*/
if (i > 0 && CPUFREQ_CMP(lev->total_set.freq,
levels[i - 1].total_set.freq)) {
sc->all_count--;
continue;
}
/* Skip levels that have a frequency that is too low. */
if (lev->total_set.freq < cf_lowest_freq) {
sc->all_count--;