Re: [PATCH 00/12] selftests: Miscellaneous fixes

[Masahiro Yamada]

On Mon, Jan 14, 2019 at 10:52 PM Geert Uytterhoeven
<geert+renesas@xxxxxxxxx> wrote:
>
>         Hi all,
>
> This patch series contains several build fixes and cleanups for issues I
> encountered when trying to cross-build an rtctest binary in a separate
> output directory (like I use for all my kernel builds).

Geert,
Thanks for working on this!


My fundamental question is,
why did tools/ opt out Kbuild?

I think lots of mess comes in
in order to support
  cd tools/gpio; make

instead of

  make tools/gpio/


Lots of files are duplicated in tools/build/
in order to invent a different build system for tools/


Similar, but not exactly the same files. For example,

diff -u scripts/basic/fixdep.c tools/build/fixdep.c




> Most patches are independent. Exceptions are:
>   - Patch 3 depends on patch 2,
>   - Patch 7 depends on patch 6,
>   - Patch 11 depends on patches 2 and 3,
>
> This has been tested with native (amd64):
>   - make kselftest-build
>   - make -C tools/testing/selftests
>   - make O=/tmp/kselftest kselftest-build
>   - make O=/tmp/kselftest -C tools/testing/selftests
> and cross-builds (arm):
>   - make kselftest-build (from a separate output directory).
>
> Known remaining issues (not introduced by this patch series):
>   - tools/lib/bpf fails to build in some cases (cfr.
>     https://lore.kernel.org/lkml/CAMuHMdXRN=mSKTjZNBSxQi-pkgSrKqeANxD-GB+hqC8pDjx7nQ@xxxxxxxxxxxxxx/),
>   - tools/gpio is not always built correctly,
>   - When building in a separate output directory, there are still files
>     created in the source directory under:
>         - arch/x86/include/generated/,
>         - arch/x86/tools/,
>         - include/generated/uapi/linux,
>         - scripts (fixdep and unifdef),
>   - Some tests may fail to find the installed header files,
>   - There may be^H^H^H^H^H^Hare more.
>
> Thanks for your comments!
>
> Geert Uytterhoeven (12):
>   selftests: gpio-mockup-chardev: Check asprintf() for error
>   selftests: Fix output directory with O=
>   selftests: Fix header install directory with O=
>   selftests: android: ion: Fix ionmap_test dependencies
>   selftests: seccomp: Fix test dependencies and rules
>   selftests: lib.mk: Add rule to build object file from C source file
>   selftests: memfd: Fix build with O=
>   selftests: timestamping: Remove superfluous rules
>   selftests: sparc64: Remove superfluous rules
>   selftests: intel_pstate: Remove unused header dependency rule
>   selftests: Add kselftest-build target
>   [RFC] selftests: gpio: Fix building tools/gpio from kselftests
>
>  Documentation/dev-tools/kselftest.rst             |  4 ++++
>  Makefile                                          |  9 +++++++--
>  tools/testing/selftests/android/ion/Makefile      |  6 +-----
>  tools/testing/selftests/gpio/Makefile             | 12 +++++++-----
>  .../testing/selftests/gpio/gpio-mockup-chardev.c  |  9 ++++++---
>  tools/testing/selftests/intel_pstate/Makefile     |  2 --
>  tools/testing/selftests/lib.mk                    |  4 ++++
>  tools/testing/selftests/memfd/Makefile            |  8 +++-----
>  .../selftests/networking/timestamping/Makefile    |  5 -----
>  tools/testing/selftests/seccomp/Makefile          | 15 +++------------
>  tools/testing/selftests/sparc64/drivers/Makefile  |  4 ----
>  11 files changed, 35 insertions(+), 43 deletions(-)
>
> --
> 2.17.1
>
> Gr{oetje,eeting}s,
>
>                                                 Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                                             -- Linus Torvalds



-- 
Best Regards
Masahiro Yamada