x86: don't disable the APIC if it hasn't been mapped yet

[deliverable/linux.git] / arch / x86 / kernel / apic_32.c

diff --git a/arch/x86/kernel/apic_32.c b/arch/x86/kernel/apic_32.c
index d07a603807d19e55e83d42119ba20010847025b1..35a568ea8400269f4fde96377e76e1013fc5c3e3 100644 (file)
--- a/arch/x86/kernel/apic_32.c
+++ b/arch/x86/kernel/apic_32.c
@@ -99,6 +99,8 @@ static DEFINE_PER_CPU(struct clock_event_device, lapic_events);
 /* Local APIC was disabled by the BIOS and enabled by the kernel */
 static int enabled_via_apicbase;
 
+static unsigned long apic_phys;
+
 /*
  * Get the LAPIC version
  */
@@ -631,9 +633,14 @@ int setup_profiling_timer(unsigned int multiplier)
  */
 void clear_local_APIC(void)
 {
-       int maxlvt = lapic_get_maxlvt();
+       int 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.
@@ -1120,8 +1127,6 @@ no_apic:
  */
 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