Bump ABI to 2

- Drop ABI reference files and ABI maintenance patch
- Delete claim that ignoring ABI changes is a build fix

debian/changelog

@@ -154,10 +154,11 @@ linux (4.18.9-1) UNRELEASED; urgency=medium
     group specified, to fix reproducibility issues.
 
   [ Ben Hutchings ]
-  * drivers/net/ethernet: Ignore ABI changes (fixes FTBFS on arm64, armhf)
+  * drivers/net/ethernet: Ignore ABI changes
   * [arm64] ACPI: Change ACPI_NFIT from built-in to module
   * [i386/686] Enable MGEODE_LX instead of M686 (regression in 4.16)
     - x86-32: Disable 3D-Now in generic config
+  * Bump ABI to 2
 
   [ Yves-Alexis Perez ]
   * [x86] enable PINCTRL_AMD for touchpad support on Lenovo IdeaPad.

debian/config/defines

@@ -1,5 +1,5 @@
 [abi]
-abiname: 1
+abiname: 2
 ignore-changes:
  __cpuhp_*
  __xive_vm_h_*

debian/patches/debian/abi/mm-avoid-abi-change-in-4.18.7.patch

@@ -1,30 +0,0 @@
-From: Ben Hutchings <ben@decadent.org.uk>
-Date: Mon, 17 Sep 2018 01:11:22 +0100
-Subject: mm: Avoid ABI change in 4.18.7
-Forwarded: not-needed
-
-Commit 8bfd9029bc79 "powerpc/64s: Fix page table fragment refcount race
-vs speculative references" introduced a union with another alternate use
-for one of the words in struct page.
-
-The layout of the structure is unchanged, and this use is private to
-the powerpc page table allocator, so it's not actually an ABI change.
-Therefore hide it from genksyms.
----
---- a/include/linux/mm_types.h
-+++ b/include/linux/mm_types.h
-@@ -139,10 +139,14 @@ struct page {
- 			unsigned long _pt_pad_1;	/* compound_head */
- 			pgtable_t pmd_huge_pte; /* protected by page->ptl */
- 			unsigned long _pt_pad_2;	/* mapping */
-+#ifndef __GENKSYMS__
- 			union {
- 				struct mm_struct *pt_mm; /* x86 pgds only */
- 				atomic_t pt_frag_refcount; /* powerpc */
- 			};
-+#else
-+			struct mm_struct *pt_mm; /* x86 pgds only */
-+#endif
- #if ALLOC_SPLIT_PTLOCKS
- 			spinlock_t *ptl;
- #else

debian/patches/series

@@ -168,4 +168,3 @@ bugfix/all/usbip-fix-misuse-of-strncpy.patch
 debian/wireless-disable-regulatory.db-direct-loading.patch
 
 # ABI maintenance
-debian/abi/mm-avoid-abi-change-in-4.18.7.patch