perf_counter tools: Rename cache events to remove $

[linux-block.git] / arch / x86 / kernel / smp.c

diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c
index f6db48c405b81fca925988fa0fc408f078793722..ec1de97600e70638bcfdcb53da52a83bc1288829 100644 (file)
--- a/arch/x86/kernel/smp.c
+++ b/arch/x86/kernel/smp.c
@@ -150,14 +150,40 @@ void native_send_call_func_ipi(const struct cpumask *mask)
  * this function calls the 'stop' function on all other CPUs in the system.
  */
 
+asmlinkage void smp_reboot_interrupt(void)
+{
+       ack_APIC_irq();
+       irq_enter();
+       stop_this_cpu(NULL);
+       irq_exit();
+}
+
 static void native_smp_send_stop(void)
 {
        unsigned long flags;
+       unsigned long wait;
 
        if (reboot_force)
                return;
 
-       smp_call_function(stop_this_cpu, NULL, 0);
+       /*
+        * Use an own vector here because smp_call_function
+        * does lots of things not suitable in a panic situation.
+        * On most systems we could also use an NMI here,
+        * but there are a few systems around where NMI
+        * is problematic so stay with an non NMI for now
+        * (this implies we cannot stop CPUs spinning with irq off
+        * currently)
+        */
+       if (num_online_cpus() > 1) {
+               apic->send_IPI_allbutself(REBOOT_VECTOR);
+
+               /* Don't wait longer than a second */
+               wait = USEC_PER_SEC;
+               while (num_online_cpus() > 1 && wait--)
+                       udelay(1);
+       }
+
        local_irq_save(flags);
        disable_local_APIC();
        local_irq_restore(flags);
@@ -172,6 +198,9 @@ void smp_reschedule_interrupt(struct pt_regs *regs)
 {
        ack_APIC_irq();
        inc_irq_stat(irq_resched_count);
+       /*
+        * KVM uses this interrupt to force a cpu out of guest mode
+        */
 }
 
 void smp_call_function_interrupt(struct pt_regs *regs)