diff --git a/arch/x86/kernel/apic_32.c b/arch/x86/kernel/apic_32.c index cbcf72cde956f4d9494ebaab30d5a0ee6b3948ba..20d4dbc42e6ef2ce54fbdf8d668bf3f0bc9f4460 100644 --- a/arch/x86/kernel/apic_32.c +++ b/arch/x86/kernel/apic_32.c @@ -470,6 +470,19 @@ void __init setup_boot_APIC_clock(void) local_apic_timer_verify_ok = 1; + /* + * Do a sanity check on the APIC calibration result + */ + if (calibration_result < (1000000 / HZ)) { + local_irq_enable(); + printk(KERN_WARNING + "APIC frequency too slow, disabling apic timer\n"); + /* No broadcast on UP ! */ + if (num_possible_cpus() > 1) + setup_APIC_timer(); + return; + } + /* We trust the pm timer based calibration */ if (!pm_referenced) { apic_printk(APIC_VERBOSE, "... verify APIC timer\n"); diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c index d1a696673d9d7132f5bf0729bae111b5c73a4c1d..731b48660fc4385249fb305afbbe023947331785 100644 --- a/arch/x86/kernel/apic_64.c +++ b/arch/x86/kernel/apic_64.c @@ -383,6 +383,18 @@ void __init setup_boot_APIC_clock(void) printk(KERN_INFO "Using local APIC timer interrupts.\n"); calibrate_APIC_clock(); + /* + * Do a sanity check on the APIC calibration result + */ + if (calibration_result < (1000000 / HZ)) { + printk(KERN_WARNING + "APIC frequency too slow, disabling apic timer\n"); + /* No broadcast on UP ! */ + if (num_possible_cpus() > 1) + setup_APIC_timer(); + return; + } + /* * If nmi_watchdog is set to IO_APIC, we need the * PIT/HPET going. Otherwise register lapic as a dummy