Make sure that the processor is actually online or die spectacularly.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index 25762917e822..798fce509398 100644
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -142,6 +142,11 @@ int smp_call_function (void (*func) (void *info), void *info, int retry,
         int i, cpus = num_online_cpus() - 1;
         int cpu = smp_processor_id();
 
+        /*
+         * Can die spectacularly if this CPU isn't yet marked online
+         */
+        BUG_ON(!cpu_online(cpu));
+
         if (!cpus)
                 return 0;