Include <linux/cpu.h> to make sure arch_cpu_idle_dead() matches its
prototype going forward.

Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
---
 arch/alpha/kernel/process.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/alpha/kernel/process.c b/arch/alpha/kernel/process.c
index 0eddd22c6212..4813172547b5 100644
--- a/arch/alpha/kernel/process.c
+++ b/arch/alpha/kernel/process.c
@@ -9,6 +9,7 @@
  * This file handles the architecture-dependent parts of process handling.
  */
 
+#include <linux/cpu.h>
 #include <linux/errno.h>
 #include <linux/module.h>
 #include <linux/sched.h>
-- 
2.39.0