diff options
Diffstat (limited to 'arch/x86/kernel/apic_64.c')
| -rw-r--r-- | arch/x86/kernel/apic_64.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c index 85bd3d4..a7a38c9 100644 --- a/arch/x86/kernel/apic_64.c +++ b/arch/x86/kernel/apic_64.c @@ -81,6 +81,8 @@ static struct clock_event_device lapic_clockevent = { }; static DEFINE_PER_CPU(struct clock_event_device, lapic_events); +static unsigned long apic_phys; + /* * Get the LAPIC version */ @@ -525,6 +527,11 @@ void clear_local_APIC(void) int maxlvt = lapic_get_maxlvt(); u32 v; + /* APIC hasn't been mapped yet */ + if (!apic_phys) + return; + + maxlvt = lapic_get_maxlvt(); /* * Masking an LVT entry can trigger a local APIC error * if the vector is zero. Mask LVTERR first to prevent this. @@ -859,8 +866,6 @@ static int __init detect_init_APIC(void) */ void __init init_apic_mappings(void) { - unsigned long apic_phys; - /* * If no local APIC can be found then set up a fake all * zeroes page to simulate the local APIC and another |