Test report before applying this patchset. Note that empty lines (or
empty lines with "-") has been added to make it easier to run vimdiff.

** Tags added: 4.15 bionic

** Tags added: ubuntu-kernel-selftests

** Description changed:

  [Impact]
  With 4.15 kernel, not all binary files inside a subtest directory in 
tools/testing/selftests of a kernel tree can be built with command:
    make TARGETS=$subtest
  
  For example, the following tests in net directory won't be built:
   * reuseport_bpf
   * reuseport_bpf_cpu
   * reuseport_dualstack
   * reuseaddr_conflict
   * reuseport_bpf_numa
  
  They can be build with:
    make TARGETS=net run_tests
  
  However, this will also start all of the tests in this subset, which is
  not ideal for the granularity improvement.
  
  [Fix]
  1. 14f1889f selftests: Fix loss of test output in run_kselftests.sh
  2. 44f01352 selftests: Makefile set KSFT_TAP_LEVEL to prevent nested TAP 
headers
  3. 8ce72dc3 selftests: fix headers_install circular dependency
  4. 27d79a2b selftests: fix bpf build/test workflow regression when 
KBUILD_OUTPUT is set
  5. e2e88325 selftests: vm: Fix test build failure when built by itself
  
  The 2nd needs to be backported with some context adjustment.
  The 3rd and 4th patch would need to be applied with -C2, the other two can be 
cherry-picked for Bionic.
  
  The third patch (8ce72dc3) is the fix for this issue. The 4th (27d79a2b)
  and the 5th (e2e88325) have been marked as a fix for 8ce72dc3.
  
  [Test]
- Tested on a baremetal node "glameow" with 4.15.0-159-generic, the test cases 
number and results are identical before and after applying this change.
+ Tested on a baremetal node "glameow" with 4.15.0-159-generic, the test cases 
number and results are identical before and after applying this change 
(compared side-by-side).
+ 
+ Please find attachment in the bug report for the test result.
  
  [Where problems could occur]
  As this is just tested with generic Bionic 4.15 kernel on a bare-metal 
system, it's is possible to see other issues on different variants. If this 
change is incorrect it will cause issue to our automated-testing and 
regression-testing, but it won't affect the real kernel functionality.

** Attachment added: "original-test-report.log"
   
https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1949889/+attachment/5538394/+files/original-test-report.log

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https://bugs.launchpad.net/bugs/1949889

Title:
  Unable to build net/reuseport_bpf and other tests in
  ubuntu_kernel_selftests on Bionic with make command

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Bionic:
  New

Bug description:
  [Impact]
  With 4.15 kernel, not all binary files inside a subtest directory in 
tools/testing/selftests of a kernel tree can be built with command:
    make TARGETS=$subtest

  For example, the following tests in net directory won't be built:
   * reuseport_bpf
   * reuseport_bpf_cpu
   * reuseport_dualstack
   * reuseaddr_conflict
   * reuseport_bpf_numa

  They can be build with:
    make TARGETS=net run_tests

  However, this will also start all of the tests in this subset, which
  is not ideal for the granularity improvement.

  [Fix]
  1. 14f1889f selftests: Fix loss of test output in run_kselftests.sh
  2. 44f01352 selftests: Makefile set KSFT_TAP_LEVEL to prevent nested TAP 
headers
  3. 8ce72dc3 selftests: fix headers_install circular dependency
  4. 27d79a2b selftests: fix bpf build/test workflow regression when 
KBUILD_OUTPUT is set
  5. e2e88325 selftests: vm: Fix test build failure when built by itself

  The 2nd needs to be backported with some context adjustment.
  The 3rd and 4th patch would need to be applied with -C2, the other two can be 
cherry-picked for Bionic.

  The third patch (8ce72dc3) is the fix for this issue. The 4th
  (27d79a2b) and the 5th (e2e88325) have been marked as a fix for
  8ce72dc3.

  [Test]
  Tested on a baremetal node "glameow" with 4.15.0-159-generic, the test cases 
number and results are identical before and after applying this change 
(compared side-by-side).

  Please find attachment in the bug report for the test result.

  [Where problems could occur]
  As this is just tested with generic Bionic 4.15 kernel on a bare-metal 
system, it's is possible to see other issues on different variants. If this 
change is incorrect it will cause issue to our automated-testing and 
regression-testing, but it won't affect the real kernel functionality.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1949889/+subscriptions


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