Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/Documentation/process/adding-syscalls.rst b/Documentation/process/adding-syscalls.rst
index 0d4f29b..1c3a840 100644
--- a/Documentation/process/adding-syscalls.rst
+++ b/Documentation/process/adding-syscalls.rst
@@ -1,3 +1,6 @@
+
+.. _addsyscalls:
+
 Adding a New System Call
 ========================
 
@@ -232,7 +235,7 @@
    by the option.
  - Make the option depend on EXPERT if it should be hidden from normal users.
  - Make any new source files implementing the function dependent on the CONFIG
-   option in the Makefile (e.g. ``obj-$(CONFIG_XYZZY_SYSCALL) += xyzzy.c``).
+   option in the Makefile (e.g. ``obj-$(CONFIG_XYZZY_SYSCALL) += xyzzy.o``).
  - Double check that the kernel still builds with the new CONFIG option turned
    off.