1 files changed, 4 insertions, 0 deletions

diff --git a/arch/i386/kernel/smp.c b/arch/i386/kernel/smp.c
index 31e5c6573aae..9827cf927ecb 100644
--- a/arch/i386/kernel/smp.c
+++ b/arch/i386/kernel/smp.c
@@ -699,6 +699,10 @@ int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
                 put_cpu();
                 return -EBUSY;
         }
+
+        /* Can deadlock when called with interrupts disabled */
+        WARN_ON(irqs_disabled());
+
         spin_lock_bh(&call_lock);
         __smp_call_function_single(cpu, func, info, nonatomic, wait);
         spin_unlock_bh(&call_lock);