Revert "arm64/mm: Limit TASK_SIZE_64 ..." and add breaks on incompatible mozjs

mozjs assumed VAs would never be wider than 47 bits.  Add Breaks to
force upgrades of those packages.  For mozjs 1.8.5 the fix requires an
ABI change so this is unversioned; for mozjs 24 there was no ABI
change so this is versioned.

(luajit has the same problem but only the experimental version
supports arm64.  I assume this will be fixed before it goes into
unstable, so we don't need it in Breaks.)

debian/changelog

@@ -18,6 +18,8 @@ linux (4.9-1~exp1) UNRELEASED; urgency=medium
   * [armhf] gpio: Enable GPIO_MCP23S08 as module (Closes: #845064)
   * aufs: Update support patchset to aufs4.9-20161219
   * Use debhelper compatibility level 9
+  * [arm64] Revert "arm64/mm: Limit TASK_SIZE_64 ..." and add breaks on
+    incompatible mozjs
 
   [ Uwe Kleine-König ]
   * enable `perf data' support; patch by Sebastian Andrzej Siewior

debian/config/arm64/defines

@@ -10,6 +10,7 @@ vdso: true
 
 [image]
 install-stem: vmlinuz
+breaks: libmozjs185-1.0, libmozjs-24-0 (<< 24.2.0-5.1~)
 
 [arm64_description]
 hardware: 64-bit ARMv8 machines

debian/patches/bugfix/arm64/arm64-mm-limit-task_size_64-for-compatibility.patch

@@ -1,27 +0,0 @@
-From: Ben Hutchings <ben@decadent.org.uk>
-Date: Fri, 16 Sep 2016 16:32:23 +0100
-Subject: arm64/mm: Limit TASK_SIZE_64 for compatibility
-
-Some programs assume they can use 17 tag bits in a 64-bit pointer,
-which works on most other 64-bit architectures but not on arm64 with
-CONFIG_ARM64_VA_BITS_48.  To maintain compatibility with these
-programs, limit TASK_SIZE_64 to a maximum of 1 << 47.
-
-Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
----
-
---- a/arch/arm64/include/asm/memory.h
-+++ b/arch/arm64/include/asm/memory.h
-@@ -74,7 +74,12 @@
- #define PCI_IO_END		(VMEMMAP_START - SZ_2M)
- #define PCI_IO_START		(PCI_IO_END - PCI_IO_SIZE)
- #define FIXADDR_TOP		(PCI_IO_START - SZ_2M)
-+#if VA_BITS <= 47
- #define TASK_SIZE_64		(UL(1) << VA_BITS)
-+#else
-+/* User-space might use up to 17 tag bits in 64-bit pointers */
-+#define TASK_SIZE_64		(UL(1) << 47)
-+#endif
- 
- #ifdef CONFIG_COMPAT
- #define TASK_SIZE_32		UL(0x100000000)

debian/patches/series

@@ -46,7 +46,6 @@ bugfix/x86/viafb-autoload-on-olpc-xo1.5-only.patch
 debian/fanotify-taint-on-use-of-fanotify_access_permissions.patch
 
 # Arch bug fixes
-bugfix/arm64/arm64-mm-limit-task_size_64-for-compatibility.patch
 bugfix/powerpc/powerpc-boot-request-no-dynamic-linker-for-boot-wrap.patch
 
 # Arch features