linux-kernel - [PATCH 00/10] selftests: Fix separate output directory builds

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Date:   Tue, 18 Jan 2022 16:28:59 +0500
From:   Muhammad Usama Anjum <usama.anjum@...labora.com>
To:     Shuah Khan <shuah@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Darren Hart <dvhart@...radead.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        André Almeida <andrealmeid@...labora.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Mickaël Salaün <mic@...ikod.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        chiminghao <chi.minghao@....com.cn>,
        linux-kselftest@...r.kernel.org (open list:KERNEL SELFTEST FRAMEWORK),
        linux-kernel@...r.kernel.org (open list),
        kvm@...r.kernel.org (open list:KERNEL VIRTUAL MACHINE (KVM)),
        linux-security-module@...r.kernel.org (open list:LANDLOCK SECURITY
        MODULE), netdev@...r.kernel.org (open list:NETWORKING [GENERAL]),
        mptcp@...ts.linux.dev (open list:NETWORKING [MPTCP]),
        linux-mm@...ck.org (open list:MEMORY MANAGEMENT)
Cc:     Muhammad Usama Anjum <usama.anjum@...labora.com>,
        kernel@...labora.com
Subject: [PATCH 00/10] selftests: Fix separate output directory builds

Build of several selftests fail if separate output directory is
specified by the following methods:
1) make -C tools/testing/selftests O=<build_dir>
2) export KBUILD_OUTPUT="build_dir"; make -C tools/testing/selftests

Build fails because of several reasons:
1) The kernel headers aren't found.
2) The path of output objects is wrong and hence unaccessible.

These problems can be solved by:
1) Including the correct path of uapi header files
2) By setting the BUILD variable correctly inside Makefile

Following different build scnerios have been tested after making these
changes:
make -C tools/testing/selftests
make -C tools/testing/selftests O=build
make -C tools/testing/selftests o=/opt/build
export KBUILD_OUTPUT="/opt/build"; make -C tools/testing/selftests
export KBUILD_OUTPUT="build"; make -C tools/testing/selftests
cd <any_dir>; make -C <src_path>/tools/testing/selftests
cd <any_dir>; make -C <src_path>/tools/testing/selftests O=build

Muhammad Usama Anjum (10):
  selftests: set the BUILD variable to absolute path
  selftests: Add and export a kernel uapi headers path
  selftests: Correct the headers install path
  selftests: futex: Add the uapi headers include variable
  selftests: kvm: Add the uapi headers include variable
  selftests: landlock: Add the uapi headers include variable
  selftests: net: Add the uapi headers include variable
  selftests: mptcp: Add the uapi headers include variable
  selftests: vm: Add the uapi headers include variable
  selftests: vm: remove dependecy from internal kernel macros

 tools/testing/selftests/Makefile              | 32 +++++++++++++------
 .../selftests/futex/functional/Makefile       |  5 ++-
 tools/testing/selftests/kvm/Makefile          |  6 ++--
 tools/testing/selftests/landlock/Makefile     | 11 ++-----
 tools/testing/selftests/net/Makefile          |  2 +-
 tools/testing/selftests/net/mptcp/Makefile    |  3 +-
 tools/testing/selftests/vm/Makefile           |  2 +-
 tools/testing/selftests/vm/userfaultfd.c      |  3 ++
 8 files changed, 35 insertions(+), 29 deletions(-)

-- 
2.30.2