x86, NMI: NMI-selftest should handle the UP case properly

If no remote cpus are online, then just quietly skip the remote
IPI test for now.

Signed-off-by: Don Zickus <dzickus@redhat.com>
Cc: andi@firstfloor.org
Cc: torvalds@linux-foundation.org
Cc: peterz@infradead.org
Cc: robert.richter@amd.com
Link: http://lkml.kernel.org/r/20111206180859.GR1669@redhat.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/x86/kernel/nmi_selftest.c b/arch/x86/kernel/nmi_selftest.c
index 572adb622251..1e42a23c1f2a 100644
--- a/arch/x86/kernel/nmi_selftest.c
+++ b/arch/x86/kernel/nmi_selftest.c
@@ -90,7 +90,8 @@ static void remote_ipi(void)
 {
         cpumask_copy(to_cpumask(nmi_ipi_mask), cpu_online_mask);
         cpumask_clear_cpu(smp_processor_id(), to_cpumask(nmi_ipi_mask));
-        test_nmi_ipi(to_cpumask(nmi_ipi_mask));
+        if (!cpumask_empty(nmi_ipi_mask))
+                test_nmi_ipi(to_cpumask(nmi_ipi_mask));
 }
 
 static void local_ipi(void)