The file refers to in_interrupt() so hardirq.h must be included.

Signed-off-by: Johannes Weiner <jw@emlix.com>
---
 arch/xtensa/kernel/traps.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -25,6 +25,7 @@
 
 #include <linux/kernel.h>
 #include <linux/sched.h>
+#include <linux/hardirq.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/stringify.h>

-- 

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