Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h
index 4a6582c..6c8512d 100644
--- a/include/linux/sched/isolation.h
+++ b/include/linux/sched/isolation.h
@@ -16,9 +16,10 @@
 };
 
 #ifdef CONFIG_CPU_ISOLATION
-DECLARE_STATIC_KEY_FALSE(housekeeping_overriden);
+DECLARE_STATIC_KEY_FALSE(housekeeping_overridden);
 extern int housekeeping_any_cpu(enum hk_flags flags);
 extern const struct cpumask *housekeeping_cpumask(enum hk_flags flags);
+extern bool housekeeping_enabled(enum hk_flags flags);
 extern void housekeeping_affine(struct task_struct *t, enum hk_flags flags);
 extern bool housekeeping_test_cpu(int cpu, enum hk_flags flags);
 extern void __init housekeeping_init(void);
@@ -35,6 +36,11 @@
 	return cpu_possible_mask;
 }
 
+static inline bool housekeeping_enabled(enum hk_flags flags)
+{
+	return false;
+}
+
 static inline void housekeeping_affine(struct task_struct *t,
 				       enum hk_flags flags) { }
 static inline void housekeeping_init(void) { }
@@ -43,7 +49,7 @@
 static inline bool housekeeping_cpu(int cpu, enum hk_flags flags)
 {
 #ifdef CONFIG_CPU_ISOLATION
-	if (static_branch_unlikely(&housekeeping_overriden))
+	if (static_branch_unlikely(&housekeeping_overridden))
 		return housekeeping_test_cpu(cpu, flags);
 #endif
 	return true;