[Xen-changelog] Occasionally large smp machines fail to reboot properly and die under

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID a898a6510c5db4e3d1f69d40fcacb540643b0f22
# Parent  e42ed43320535a13005c5cce7f3afb382d9c2af5
Occasionally large smp machines fail to reboot properly and die under
an IPI storm of smp_call_function() to machine_reboot.  Only the boot
processor needs to run machine_restart, so send an IPI to CPU0.

Original patch by: Ryan Harper <ryanh@xxxxxxxxxx>

Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>

diff -r e42ed4332053 -r a898a6510c5d xen/arch/x86/shutdown.c
--- a/xen/arch/x86/shutdown.c   Thu Apr 27 09:49:48 2006 +0100
+++ b/xen/arch/x86/shutdown.c   Thu Apr 27 09:56:21 2006 +0100
@@ -218,7 +218,9 @@ void machine_restart(char * __unused)
     /* Ensure we are the boot CPU. */
     if ( GET_APIC_ID(apic_read(APIC_ID)) != boot_cpu_physical_apicid )
     {
-        smp_call_function((void *)machine_restart, NULL, 1, 0);
+        /* Send IPI to the boot CPU (logical cpu 0). */
+        on_selected_cpus(cpumask_of_cpu(0), (void *)machine_restart,
+                         NULL, 1, 0);
         for ( ; ; )
             safe_halt();
     }

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