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[Bug 1808318] Re: powerpc test in ubuntu_kernel_selftest failed on Cosmic P8/P9

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https://bugs.launchpad.net/bugs/1808318

Title:
  powerpc test in ubuntu_kernel_selftest failed on Cosmic P8/P9

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Cosmic:
  Fix Released

Bug description:
  == Justification ==
  Commit b2d35fa5fc80 ("selftests: add headers_install to lib.mk")
  introduced a requirement that Makefiles more than one level below the
  selftests directory need to define top_srcdir, but it didn't update
  any of the powerpc Makefiles.

  This broke building all the powerpc selftests with eg:

    make[1]: Entering directory '/src/linux/tools/testing/selftests/powerpc'
    BUILD_TARGET=/src/linux/tools/testing/selftests/powerpc/alignment; mkdir -p $BUILD_TARGET; make OUTPUT=$BUILD_TARGET -k -C alignment all
    make[2]: Entering directory '/src/linux/tools/testing/selftests/powerpc/alignment'
    ../../lib.mk:20: ../../../../scripts/subarch.include: No such file or directory
    make[2]: *** No rule to make target '../../../../scripts/subarch.include'.
    make[2]: Failed to remake makefile '../../../../scripts/subarch.include'.
    Makefile:38: recipe for target 'alignment' failed

  == Fix ==
  7e0cf1c983b5 (selftests/powerpc: Fix Makefiles for headers_install change)
  It can be cherry-picked for Cosmic. And it's already landed in Disco.

  == Regression Potential ==
  None, this just fixes the broken build issue for the test. Nothing else will be affected.

  
  ===
  This test passed with 4.18.0-12 on the last cycle [1]
  But failed with the proposed 4.18.0-13 this time.

  Test failed to build because of a missing include file:
  50.	../../lib.mk:20: ../../../../scripts/subarch.include: No such file or directory

  Tried to reproduce this cycle with 4.18.0-12 first and this can be
  reproduced as well.

  39.	make: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc'
  40.	BUILD_TARGET=/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/alignment; mkdir -p $BUILD_TARGET; make OUTPUT=$BUILD_TARGET -k -C alignment all
  41.	make[1]: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/alignment'
  42.	gcc -std=gnu99 -O2 -Wall -Werror -DGIT_VERSION='"Ubuntu-4.18.0-12.13-0-g3d21f8e15-dirty"' -I/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/include copy_unaligned.c ../harness.c ../utils.c copy_paste_unaligned_common.c -o /home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/alignment/copy_unaligned
  43.	gcc -std=gnu99 -O2 -Wall -Werror -DGIT_VERSION='"Ubuntu-4.18.0-12.13-0-g3d21f8e15-dirty"' -I/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/include copy_first_unaligned.c ../harness.c ../utils.c copy_paste_unaligned_common.c -o /home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/alignment/copy_first_unaligned
  44.	gcc -std=gnu99 -O2 -Wall -Werror -DGIT_VERSION='"Ubuntu-4.18.0-12.13-0-g3d21f8e15-dirty"' -I/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/include paste_unaligned.c ../harness.c ../utils.c copy_paste_unaligned_common.c -o /home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/alignment/paste_unaligned
  45.	gcc -std=gnu99 -O2 -Wall -Werror -DGIT_VERSION='"Ubuntu-4.18.0-12.13-0-g3d21f8e15-dirty"' -I/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/include paste_last_unaligned.c ../harness.c ../utils.c copy_paste_unaligned_common.c -o /home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/alignment/paste_last_unaligned
  46.	gcc -std=gnu99 -O2 -Wall -Werror -DGIT_VERSION='"Ubuntu-4.18.0-12.13-0-g3d21f8e15-dirty"' -I/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/include alignment_handler.c ../harness.c ../utils.c copy_paste_unaligned_common.c -o /home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/alignment/alignment_handler
  47.	make[1]: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/alignment'
  48.	make: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc'
  49.	stderr:
  50.	../../lib.mk:20: ../../../../scripts/subarch.include: No such file or directory
  51.	make[1]: *** No rule to make target '../../../../scripts/subarch.include'.
  52.	make[1]: Failed to remake makefile '../../../../scripts/subarch.include'.
  53.	make: *** [Makefile:38: alignment] Error 2

  [1] http://10.246.72.4/test-
  results/4.18.0-12.13-generic/entei__4.18.0-12.13__2018-11-15_16-03-00/ubuntu_kernel_selftests/results/ubuntu_kernel_selftests.powerpc/debug/ubuntu_kernel_selftests.powerpc.DEBUG.html

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.18.0-12-generic 4.18.0-12.13
  ProcVersionSignature: Ubuntu 4.18.0-12.13-generic 4.18.17
  Uname: Linux 4.18.0-12-generic ppc64le
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Dec 13 10:20 seq
   crw-rw---- 1 root audio 116, 33 Dec 13 10:20 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.10-0ubuntu13.1
  Architecture: ppc64el
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CurrentDmesg:
   [ 1446.852560] cfg80211: Loading compiled-in X.509 certificates for regulatory database
   [ 1446.855825] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
  Date: Thu Dec 13 10:44:35 2018
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  PciMultimedia:

  ProcFB: 0 astdrmfb
  ProcKernelCmdLine: root=UUID=6525e2fe-bc80-40f5-b02a-e96f41545ae3 ro console=hvc0
  ProcLoadAvg: 0.48 0.57 0.47 1/1187 25045
  ProcLocks:
   1: POSIX  ADVISORY  WRITE 1528 00:17:430 0 EOF
   2: FLOCK  ADVISORY  WRITE 3335 00:17:716 0 EOF
   3: POSIX  ADVISORY  WRITE 3336 00:17:695 0 EOF
  ProcSwaps:
   Filename				Type		Size	Used	Priority
   /swap.img                               file		8388544	0	-2
  ProcVersion: Linux version 4.18.0-12-generic (buildd@bos02-ppc64el-005) (gcc version 8.2.0 (Ubuntu 8.2.0-7ubuntu1)) #13-Ubuntu SMP Wed Nov 14 15:15:47 UTC 2018
  RelatedPackageVersions:
   linux-restricted-modules-4.18.0-12-generic N/A
   linux-backports-modules-4.18.0-12-generic  N/A
   linux-firmware                             1.175.1
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  VarLogDump_list: total 0
  cpu_cores: Number of cores present = 16
  cpu_coreson: Number of cores online = 16
  cpu_dscr: DSCR is 0
  cpu_freq:
   min:	3.869 GHz (cpu 127)
   max:	3.869 GHz (cpu 1)
   avg:	3.869 GHz
  cpu_runmode:
   Could not retrieve current diagnostics mode,
   No kernel interface to firmware
  cpu_smt: SMT=8

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