[PATCH v2 0/6] Fix errors when try to build kvm selftests on specified output

[Xiaoyao Li]

I attempted to build KVM selftests on a specified dir, unfortunately
neither	"make O=/path/to/mydir TARGETS=kvm" in tools/testing/selftests, nor
"make OUTPUT=/path/to/mydir" in tools/testing/selftests/kvm work.

This series aims to fix them.

Patch 1 fixes the issue that output directory is not exist.

Patch 2 and 3 are the preparation for kvm to get the right path of
installed linux headers.

Patch 4 and 6 prepare the INSTALL_HDR_PATH to tell sub TARGET where the
linux headers are installed.

Patch 5 fixes the issue that with OUTPUT specified, it still make the
linux tree dirty.

I only test the sub TARGET of kvm.
In theory, it won't break other TARGET of selftests.

Changes in v2:
 - fix the no directory issue in lib.mk
 - make kvm fixes seperate patch
 - Add the patch to fix linux src tree not clean issue

v1:
https://lore.kernel.org/kvm/20200315093425.33600-1-xiaoyao.li@xxxxxxxxx/

Xiaoyao Li (6):
  selftests: Create directory when OUTPUT specified
  selftests: kvm: Include lib.mk earlier
  selftests: kvm: Use the default linux header path only when
    INSTALL_HDR_PATH not defined
  selftests: Create variable INSTALL_HDR_PATH if need to install linux
    headers to $(OUTPUT)/usr
  selftests: Generate build output of linux headers to
    $(OUTPUT)/linux-header-build
  selftests: export INSTALL_HDR_PATH if using "O" to specify output dir

 tools/testing/selftests/Makefile     |  6 +++++-
 tools/testing/selftests/kvm/Makefile |  9 +++++----
 tools/testing/selftests/lib.mk       | 19 ++++++++++++++++++-
 3 files changed, 28 insertions(+), 6 deletions(-)

-- 
2.20.1