Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/arm/include/asm/ptdump.h b/arch/arm/include/asm/ptdump.h
index 3ebf971..0c2d3d0 100644
--- a/arch/arm/include/asm/ptdump.h
+++ b/arch/arm/include/asm/ptdump.h
@@ -21,13 +21,10 @@
 
 void ptdump_walk_pgd(struct seq_file *s, struct ptdump_info *info);
 #ifdef CONFIG_ARM_PTDUMP_DEBUGFS
-int ptdump_debugfs_register(struct ptdump_info *info, const char *name);
+void ptdump_debugfs_register(struct ptdump_info *info, const char *name);
 #else
-static inline int ptdump_debugfs_register(struct ptdump_info *info,
-					const char *name)
-{
-	return 0;
-}
+static inline void ptdump_debugfs_register(struct ptdump_info *info,
+					   const char *name) { }
 #endif /* CONFIG_ARM_PTDUMP_DEBUGFS */
 
 void ptdump_check_wx(void);