init: Avoid ABI change for build salt

debian/changelog

@@ -14,6 +14,7 @@ linux (4.17.6-2) UNRELEASED; urgency=medium
     - kbuild: Add build salt to the kernel and modules
     - [arm64,powerpc,x86] Add build salt to the vDSO
     - Set BUILD_SALT equal to the release string
+  * init: Avoid ABI change for build salt
 
   [ Vagrant Cascadian ]
   * [riscv64] Build linux-libc-dev (Closes: #886440).

debian/patches/debian/init-avoid-abi-change-for-build-salt.patch

@@ -0,0 +1,24 @@
+From: Ben Hutchings <ben@decadent.org.uk>
+Date: Sun, 15 Jul 2018 23:44:02 +0100
+Subject: init: Avoid ABI change for build salt
+Forwarded: not-needed
+
+<linux/build-salt.h> indirectly includes <linux/elf.h>, which
+apparently adds some type definitions that change the symbol
+version for init_uts_ns.
+
+Hide this change from genksyms.
+
+---
+--- a/init/version.c
++++ b/init/version.c
+@@ -7,7 +7,9 @@
+  */
+ 
+ #include <generated/compile.h>
++#ifndef __GENKSYMS__
+ #include <linux/build-salt.h>
++#endif
+ #include <linux/export.h>
+ #include <linux/uts.h>
+ #include <linux/utsname.h>

debian/patches/series

@@ -161,3 +161,4 @@ debian/wireless-disable-regulatory.db-direct-loading.patch
 # ABI maintenance
 debian/hid-avoid-abi-change-in-4.17.6.patch
 debian/dax-avoid-abi-change-in-4.17.6.patch
+debian/init-avoid-abi-change-for-build-salt.patch