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x86, vmi: TSC going backwards check in vmi clocksource

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Impact: fix time warps under vmware

Similar to the check for TSC going backwards in the TSC clocksource,
we also need this check for VMI clocksource.

Signed-off-by: Alok N Kataria <akataria@vmware.com>
Cc: Zachary Amsden <zach@vmware.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: stable@kernel.org
This commit is contained in:
Alok N Kataria 2009-02-18 12:33:55 -08:00 committed by Ingo Molnar
parent 402a917aca
commit 48ffc70b67
1 changed files with 4 additions and 1 deletions
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5
arch/x86/kernel/vmiclock_32.c
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@ -283,10 +283,13 @@ void __devinit vmi_time_ap_init(void)
#endif
/** vmi clocksource */
static struct clocksource clocksource_vmi;
static cycle_t read_real_cycles(void)
{
return vmi_timer_ops.get_cycle_counter(VMI_CYCLES_REAL);
cycle_t ret = (cycle_t)vmi_timer_ops.get_cycle_counter(VMI_CYCLES_REAL);
return ret >= clocksource_vmi.cycle_last ?
ret : clocksource_vmi.cycle_last;
}
static struct clocksource clocksource_vmi = {