1 files changed, 22 insertions, 3 deletions
diff --git a/arch/i386/kernel/io_apic.c b/arch/i386/kernel/io_apic.c
index f2dd218d88cb..39d9a5fa907e 100644
--- a/arch/i386/kernel/io_apic.c
+++ b/arch/i386/kernel/io_apic.c
@@ -51,6 +51,8 @@ static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
 static DEFINE_SPINLOCK(ioapic_lock);
+int timer_over_8254 __initdata = 1;
 /*
 *      Is the SiS APIC rmw bug present ?
 *      -1 = don't know, 0 = no, 1 = yes
@@ -2267,7 +2269,8 @@ static inline void check_timer(void)
        apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
        init_8259A(1);
        timer_ack = 1;
-        enable_8259A_irq(0);
+        if (timer_over_8254 > 0)
+                enable_8259A_irq(0);
        pin1  = find_isa_irq_pin(0, mp_INT);
        apic1 = find_isa_irq_apic(0, mp_INT);
@@ -2392,6 +2395,20 @@ void __init setup_IO_APIC(void)
                print_IO_APIC();
 }
+static int __init setup_disable_8254_timer(char *s)
+{
+        timer_over_8254 = -1;
+        return 1;
+}
+static int __init setup_enable_8254_timer(char *s)
+{
+        timer_over_8254 = 2;
+        return 1;
+}
+__setup("disable_8254_timer", setup_disable_8254_timer);
+__setup("enable_8254_timer", setup_enable_8254_timer);
 /*
 *      Called after all the initialization is done. If we didnt find any
 *      APIC bugs then we can allow the modify fast path
@@ -2566,8 +2583,10 @@ int __init io_apic_get_unique_id (int ioapic, int apic_id)
                spin_unlock_irqrestore(&ioapic_lock, flags);
                /* Sanity check */
-                if (reg_00.bits.ID != apic_id)
+                if (reg_00.bits.ID != apic_id) {
-                        panic("IOAPIC[%d]: Unable change apic_id!\n", ioapic);
+                        printk("IOAPIC[%d]: Unable to change apic_id!\n", ioapic);
+                        return -1;
+                }
        }
        apic_printk(APIC_VERBOSE, KERN_INFO