Commit-ID: ca3ba2a2f4a49a308e7d78c784d51b2332064f15 Gitweb: http://git.kernel.org/tip/ca3ba2a2f4a49a308e7d78c784d51b2332064f15 Author: Jason Wang <jasowang@xxxxxxxxxx> AuthorDate: Fri, 28 Feb 2014 11:30:29 +0800 Committer: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx> CommitDate: Thu, 27 Mar 2014 11:02:45 -0700 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. [ hpa: I would prefer to not defer things to "the future" in the future... ] 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> Link: http://lkml.kernel.org/r/1393558229-14755-1-git-send-email-jasowang@xxxxxxxxxx Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx> --- 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 = { -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html