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Date:	Fri, 24 Jan 2014 14:02:51 +0800
From:	Jason Wang <>
Cc:	Jason Wang <>
Subject: [PATCH] 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 <>
Cc: Haiyang Zhang <>
Signed-off-by: Jason Wang <>
 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;
@@ -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;
 const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = {

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