> -----Original Message----- > From: Jason Wang [mailto:jasowang@xxxxxxxxxx] > Sent: Thursday, February 27, 2014 7:30 PM > To: KY Srinivasan; Haiyang Zhang; tglx@xxxxxxxxxxxxx; mingo@xxxxxxxxxx; > hpa@xxxxxxxxx; x86@xxxxxxxxxx; devel@xxxxxxxxxxxxxxxxxxxxxx; linux- > kernel@xxxxxxxxxxxxxxx > Cc: Jason Wang; stable@xxxxxxxxxxxxxxx > Subject: [PATCH RESEND] x86, hyperv: bypass the timer_irq_works() check > > This patch bypass the timer_irq_works() check for hyperv guest since: > > - It was guaranteed to work. > - timer_irq_works() may fail sometime due to the lpj calibration were > inaccurate > in a hyperv guest or a buggy host. > > In the future, we should get the tsc frequency from hypervisor and use > preset lpj instead. > > Cc: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> > Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > Acked-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> > Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx> > --- > arch/x86/kernel/cpu/mshyperv.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/arch/x86/kernel/cpu/mshyperv.c > b/arch/x86/kernel/cpu/mshyperv.c index 9f7ca26..832d05a 100644 > --- a/arch/x86/kernel/cpu/mshyperv.c > +++ b/arch/x86/kernel/cpu/mshyperv.c > @@ -26,6 +26,7 @@ > #include <asm/irq_regs.h> > #include <asm/i8259.h> > #include <asm/apic.h> > +#include <asm/timer.h> > > struct ms_hyperv_info ms_hyperv; > EXPORT_SYMBOL_GPL(ms_hyperv); > @@ -105,6 +106,11 @@ static void __init ms_hyperv_init_platform(void) > > if (ms_hyperv.features & > HV_X64_MSR_TIME_REF_COUNT_AVAILABLE) > clocksource_register_hz(&hyperv_cs, NSEC_PER_SEC/100); > + > +#ifdef CONFIG_X86_IO_APIC > + no_timer_check = 1; > +#endif > + > } > > const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = { Peter, Please let us know if you have any issues with this patch. Regards, K. Y > -- > 1.8.3.2 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
