Update Linux to v5.4.148

Sourced from [1]

[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.4.148.tar.gz

Change-Id: Ib3d26c5ba9b022e2e03533005c4fed4d7c30b61b
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/include/linux/oom.h b/include/linux/oom.h
index c696c26..2db9a14 100644
--- a/include/linux/oom.h
+++ b/include/linux/oom.h
@@ -48,13 +48,14 @@
 	/* Used by oom implementation, do not set */
 	unsigned long totalpages;
 	struct task_struct *chosen;
-	unsigned long chosen_points;
+	long chosen_points;
 
 	/* Used to print the constraint info. */
 	enum oom_constraint constraint;
 };
 
 extern struct mutex oom_lock;
+extern struct mutex oom_adj_mutex;
 
 static inline void set_current_oom_origin(void)
 {
@@ -107,7 +108,7 @@
 
 bool __oom_reap_task_mm(struct mm_struct *mm);
 
-extern unsigned long oom_badness(struct task_struct *p,
+long oom_badness(struct task_struct *p,
 		unsigned long totalpages);
 
 extern bool out_of_memory(struct oom_control *oc);