[powerpc*] vdso: Make vdso32 installation conditional in vdso_install

Closes: #785065

This finally removes the need for the ppc64el compiler to support
32-bit code generation, and removes a useless file from debug
packages on ppc64el.

debian/changelog

@@ -3,6 +3,8 @@ linux (4.19.28-3) UNRELEASED; urgency=medium
   * debian/bin/abiupdate.py: Automatically select the correct archive to fetch
     from
   * debian/bin/abiupdate.py: Change default URLs to use https: scheme
+  * [powerpc*] vdso: Make vdso32 installation conditional in vdso_install
+    (Closes: #785065)
 
  -- Ben Hutchings <ben@decadent.org.uk>  Mon, 18 Mar 2019 22:50:08 +0000
 

debian/patches/bugfix/powerpc/powerpc-vdso-make-vdso32-installation-conditional-in.patch

@@ -0,0 +1,29 @@
+From: Ben Hutchings <ben@decadent.org.uk>
+Date: Fri, 22 Mar 2019 03:30:10 +0000
+Subject: powerpc: vdso: Make vdso32 installation conditional in vdso_install
+Bug-Debian: https://bugs.debian.org/785065
+Forwarded: https://lore.kernel.org/linuxppc-dev/20190322042436.nttfgsdpdshco27y@decadent.org.uk/
+
+The 32-bit vDSO is not needed and not normally built for 64-bit
+little-endian configurations.  However, the vdso_install target still
+builds and installs it.  Add the same config condition as is normally
+used for the build.
+
+Fixes: e0d005916994 ("powerpc/vdso: Disable building the 32-bit VDSO ...")
+Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
+---
+ arch/powerpc/Makefile | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/arch/powerpc/Makefile
++++ b/arch/powerpc/Makefile
+@@ -403,7 +403,9 @@ vdso_install:
+ ifdef CONFIG_PPC64
+ 	$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
+ endif
++ifdef CONFIG_VDSO32
+ 	$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso32 $@
++endif
+ 
+ archclean:
+ 	$(Q)$(MAKE) $(clean)=$(boot)

debian/patches/series

@@ -81,6 +81,7 @@ bugfix/x86/x86-kvmclock-set-offset-for-kvm-unstable-clock.patch
 bugfix/arm/ARM-dts-sun8i-h3-add-sy8106a-to-orange-pi-plus.patch
 bugfix/arm64/arm64-dts-allwinner-a64-Enable-A64-timer-workaround.patch
 bugfix/mips/MIPS-Loongson-Introduce-and-use-loongson_llsc_mb.patch
+bugfix/powerpc/powerpc-vdso-make-vdso32-installation-conditional-in.patch
 
 # Arch features
 features/mips/MIPS-increase-MAX-PHYSMEM-BITS-on-Loongson-3-only.patch