6 files changed, 37 insertions, 7 deletions

diff --git a/arch/x86/include/asm/entry_arch.h b/arch/x86/include/asm/entry_arch.h
index 4cdcf5a3c96b..69f886805ecb 100644
--- a/arch/x86/include/asm/entry_arch.h
+++ b/arch/x86/include/asm/entry_arch.h
@@ -14,6 +14,7 @@ BUILD_INTERRUPT(reschedule_interrupt,RESCHEDULE_VECTOR)
 BUILD_INTERRUPT(call_function_interrupt,CALL_FUNCTION_VECTOR)
 BUILD_INTERRUPT(call_function_single_interrupt,CALL_FUNCTION_SINGLE_VECTOR)
 BUILD_INTERRUPT(irq_move_cleanup_interrupt,IRQ_MOVE_CLEANUP_VECTOR)
+BUILD_INTERRUPT(reboot_interrupt,REBOOT_VECTOR)
 
 BUILD_INTERRUPT3(invalidate_interrupt0,INVALIDATE_TLB_VECTOR_START+0,
                  smp_invalidate_interrupt)
diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index 4e59197e29ba..1c8f28a63058 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -45,6 +45,7 @@ extern void invalidate_interrupt6(void);
 extern void invalidate_interrupt7(void);
 
 extern void irq_move_cleanup_interrupt(void);
+extern void reboot_interrupt(void);
 extern void threshold_interrupt(void);
 
 extern void call_function_interrupt(void);
diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h
index 68f7cf84a333..28477e4f2d49 100644
--- a/arch/x86/include/asm/irq_vectors.h
+++ b/arch/x86/include/asm/irq_vectors.h
@@ -88,12 +88,7 @@
 #define CALL_FUNCTION_SINGLE_VECTOR     0xfb
 #define THERMAL_APIC_VECTOR             0xfa
 #define THRESHOLD_APIC_VECTOR           0xf9
-
-#ifdef CONFIG_X86_32
-/* 0xf8 : free */
-#else
-# define UV_BAU_MESSAGE                 0xf8
-#endif
+#define REBOOT_VECTOR                   0xf8
 
 /* f0-f7 used for spreading out TLB flushes: */
 #define INVALIDATE_TLB_VECTOR_END       0xf7
@@ -117,6 +112,8 @@
  */
 #define GENERIC_INTERRUPT_VECTOR        0xed
 
+#define UV_BAU_MESSAGE                  0xec
+
 /*
  * Self IPI vector for machine checks
  */
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 711c130a8411..4234b1235652 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -976,6 +976,8 @@ END(\sym)
 #ifdef CONFIG_SMP
 apicinterrupt IRQ_MOVE_CLEANUP_VECTOR \
         irq_move_cleanup_interrupt smp_irq_move_cleanup_interrupt
+apicinterrupt REBOOT_VECTOR \
+        reboot_interrupt smp_reboot_interrupt
 #endif
 
 #ifdef CONFIG_X86_UV
diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c
index 441f6ec6e9d4..4a69ec55be3d 100644
--- a/arch/x86/kernel/irqinit.c
+++ b/arch/x86/kernel/irqinit.c
@@ -173,6 +173,9 @@ static void __init smp_intr_init(void)
         /* Low priority IPI to cleanup after moving an irq */
         set_intr_gate(IRQ_MOVE_CLEANUP_VECTOR, irq_move_cleanup_interrupt);
         set_bit(IRQ_MOVE_CLEANUP_VECTOR, used_vectors);
+
+        /* IPI used for rebooting/stopping */
+        alloc_intr_gate(REBOOT_VECTOR, reboot_interrupt);
 #endif
 #endif /* CONFIG_SMP */
 }
diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c
index f6db48c405b8..bf1831aa14fa 100644
--- 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);