task_stack.h: add missing include

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

diff --git a/include/linux/sched/task_stack.h b/include/linux/sched/task_stack.h
index f158b025c175093154fceac4db260378c40b5d97..ccd72b978e1fc7104ea7a7279513eb12a5feadcd 100644 (file)
--- a/include/linux/sched/task_stack.h
+++ b/include/linux/sched/task_stack.h
@@ -8,6 +8,7 @@
 
 #include <linux/sched.h>
 #include <linux/magic.h>
+#include <linux/refcount.h>
 
 #ifdef CONFIG_THREAD_INFO_IN_TASK