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| author | Jeff Garzik <jeff@garzik.org> | 2006-02-27 11:33:51 -0500 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2006-02-27 11:33:51 -0500 |
| commit | dbfedbb98145375106cee7ec7269611d553819dc (patch) | |
| tree | 81d2a6de51b1bb3c704e5385dbc90ca79efa69bc /arch/x86_64/kernel/apic.c | |
| parent | 7b0386921db20add25afd8678ed34a9253e512fc (diff) | |
| parent | e95a9ec1bb66e07b138861c743192f06e7b3e4de (diff) | |
Merge branch 'master'
Diffstat (limited to 'arch/x86_64/kernel/apic.c')
| -rw-r--r-- | arch/x86_64/kernel/apic.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c index e5b14c57eaa..d70605eda33 100644 --- a/arch/x86_64/kernel/apic.c +++ b/arch/x86_64/kernel/apic.c @@ -962,12 +962,14 @@ void smp_apic_timer_interrupt(struct pt_regs *regs) irq_exit(); } +int __initdata unsync_tsc_on_multicluster; + /* * oem_force_hpet_timer -- force HPET mode for some boxes. * * Thus far, the major user of this is IBM's Summit2 series: * - * Clustered boxes may have unsynced TSC problems if they are + * Some clustered boxes may have unsynced TSC problems if they are * multi-chassis. Use available data to take a good guess. * If in doubt, go HPET. */ @@ -977,6 +979,11 @@ __cpuinit int oem_force_hpet_timer(void) unsigned id; DECLARE_BITMAP(clustermap, NUM_APIC_CLUSTERS); + /* Only do this check on IBM machines - big Unisys systems + use multiple clusters too, but have synchronized TSC */ + if (!unsync_tsc_on_multicluster) + return 0; + bitmap_zero(clustermap, NUM_APIC_CLUSTERS); for (i = 0; i < NR_CPUS; i++) { |