[PATCH RFC 0/6] enable O and KBUILD_OUTPUT for kselftest

[<bamvor.zhangjian@huawei.com>]

From: Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>

Here is my first version for enabling the KBUILD_OUTPUT for kselftest.
I fix and test all the TARGET in tools/testing/selftest/Makefile. For
ppc, I test through fake target.

There are six patches in these series. And five of them clean up the
existing code. I split the clean up patches into five, hope it is easy
to review.

selftests: remove duplicated all and clean target
selftests: remove useless TEST_DIRS
selftests: add pattern rules
selftests: remove CROSS_COMPILE in dedicated Makefile
selftests: add EXTRA_CLEAN for clean target
selftests: enable O and KBUILD_OUTPUT

In the first patch, I split the test files into two types:
TEST_GEN_XXX means such file is generated during compiling. TEST_XXX
means there is no need to compile before use. The main reason of this
is the enablement of KBUILD_OUTPUT only need to care about TEST_GEN_XXX.
I wanted to copy all the TEST_XXX with TEST_GEN_XXX, but I give up this
idea in the end. Because people may puzzle why copy the file before
installation.

Because of the introducing of TEST_GEN_XXX, I update the top-level
Makefile and lib.mk selftests directory. After introduce TEST_GEN_XXX I
could remove all the unnecessary all and clean targets.

The second patch remove TEST_DIRS variable. And third patch add the
pattern for compiling the c sourc code. The fourth patch remove the
useless CROSS_COMPILE variable as it aleady exists in
"tools/testing/selftests/lib.mk".

Further more, The fifth patch add the EXTRA_CLEAN variable to clean up
the duplicated clean target

The last patch introduces the KBUILD_OUTPUT and O for kselftest instead
using the existing kbuild system because user may compile kselftest
directly (make -C tools/testing/selftests).

Bamvor Jian Zhang (6):
  selftests: remove duplicated all and clean target
  selftests: remove useless TEST_DIRS
  selftests: add default rules for c source file
  selftests: remove CROSS_COMPILE in dedicated Makefile
  selftests: add EXTRA_CLEAN for clean target
  selftests: enable O and KBUILD_OUTPUT

 Documentation/kselftest.txt                        | 13 ++++++++
 tools/testing/selftests/Makefile                   | 39 +++++++++++++++++-----
 tools/testing/selftests/breakpoints/Makefile       |  8 ++---
 tools/testing/selftests/capabilities/Makefile      | 11 ++----
 tools/testing/selftests/efivarfs/Makefile          |  8 +----
 tools/testing/selftests/exec/Makefile              | 32 ++++++++----------
 tools/testing/selftests/ftrace/Makefile            |  6 ++--
 tools/testing/selftests/futex/Makefile             | 21 +++++++++---
 tools/testing/selftests/futex/functional/Makefile  | 12 ++-----
 tools/testing/selftests/ipc/Makefile               |  7 +---
 tools/testing/selftests/kcmp/Makefile              |  6 ++--
 tools/testing/selftests/lib.mk                     | 36 ++++++++++++++++----
 tools/testing/selftests/membarrier/Makefile        |  6 +---
 tools/testing/selftests/memfd/Makefile             | 15 ++-------
 tools/testing/selftests/mount/Makefile             |  7 +---
 tools/testing/selftests/mqueue/Makefile            |  6 +---
 tools/testing/selftests/net/Makefile               | 10 +-----
 tools/testing/selftests/powerpc/Makefile           | 14 +++++---
 tools/testing/selftests/powerpc/alignment/Makefile |  9 ++---
 .../testing/selftests/powerpc/benchmarks/Makefile  | 15 ++++-----
 .../selftests/powerpc/context_switch/Makefile      |  9 ++---
 tools/testing/selftests/powerpc/copyloops/Makefile | 19 +++++------
 tools/testing/selftests/powerpc/dscr/Makefile      | 13 +++-----
 tools/testing/selftests/powerpc/math/Makefile      | 27 +++++++--------
 tools/testing/selftests/powerpc/mm/Makefile        | 18 ++++------
 tools/testing/selftests/powerpc/pmu/Makefile       | 26 +++++++--------
 tools/testing/selftests/powerpc/pmu/ebb/Makefile   | 15 +++------
 .../testing/selftests/powerpc/primitives/Makefile  |  9 ++---
 .../testing/selftests/powerpc/stringloops/Makefile |  9 ++---
 .../selftests/powerpc/switch_endian/Makefile       | 17 ++++------
 tools/testing/selftests/powerpc/syscalls/Makefile  |  9 ++---
 tools/testing/selftests/powerpc/tm/Makefile        | 19 +++++------
 tools/testing/selftests/powerpc/vphn/Makefile      | 10 ++----
 tools/testing/selftests/pstore/Makefile            |  4 +--
 tools/testing/selftests/ptrace/Makefile            |  8 +----
 tools/testing/selftests/seccomp/Makefile           |  6 +---
 tools/testing/selftests/sigaltstack/Makefile       |  5 +--
 tools/testing/selftests/size/Makefile              | 10 ++----
 tools/testing/selftests/timers/Makefile            | 10 ++----
 tools/testing/selftests/vm/Makefile                | 29 +++++++---------
 tools/testing/selftests/x86/Makefile               | 17 ++++++----
 tools/testing/selftests/zram/Makefile              |  3 +-
 42 files changed, 250 insertions(+), 323 deletions(-)

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1.8.4.5