[PATCH v4 0/8] tests: Allow tests to append tunables

[Yury Khrustalev]

The commit message in the 1st patch explains why and how. We plan
to use ability to combine test tunables to validate memory tagging
implementation in malloc: this will required added existing test
tunables to the memtag tunable.

Additionally, after this change testing for GCS and BTI support
will have significantly increased coverage becaused we will be able
to use ambient tunable to activate both BTI and GCS for most tests
except those that use their specific tunables by using:

  GLIBC_TUNABLES=glibc.cpu.aarch64_bti=1:glibc.cpu.aarch64_gcs=2 \
    make check

Passes regression on aarch64 and x86-64. OK for trunk?

---
Changes in v4:
 - Use '$(subst $(empty) ,:,$(strip $(FOO)))' instead of 'defined'
   makefile macro to avoid issues with variable expantion.
 - Fixed grammar in the comment message.
 - Fixed tests that would fail if ambient GLIBC_TUNABLES env
   variable is be used with the aarch64_gcs tunable.
 - v3: https://patchwork.sourceware.org/project/glibc/list/?series=59873

Changes in v3:
 - Reworked the whole thing to use *-TUNABLES += tunable=value
   instead of +$(eval $(call tunable-add,...,tunable=value))
   which wasn't ideal.
 - Updated makefiles that use GLIBC_TUNABLES for tests. Not all
   of them, since the old mechanism still works.
 - v2: https://patchwork.sourceware.org/project/glibc/list/?series=59742

Changes in v2:
 - Rebased.
 - v1: https://patchwork.sourceware.org/project/glibc/list/?series=59144

---
base-commit: e3e8f814e5

---

Yury Khrustalev (8):
  tests: Allow tests to append tunables
  tests: elf: Use new tunable handling
  tests: gmon: Use new tunable handling
  tests: misc: Use new tunable handling
  tests: nptl: Use new tunable handling
  tests: nptl: Remove unused code from makefile
  tests: time: Use new tunable handling
  tests: misc: Use new tunable handling for BTI and GCS tests

 Rules                                         |  32 ++++-
 benchtests/Makefile                           |   2 +-
 elf/Makefile                                  |   8 +-
 gmon/Makefile                                 |   4 +-
 malloc/Makefile                               |  10 +-
 misc/Makefile                                 |   4 +-
 nptl/Makefile                                 |   4 -
 sysdeps/pthread/Makefile                      |   2 +-
 sysdeps/unix/sysv/linux/Makefile              |   4 +-
 sysdeps/unix/sysv/linux/aarch64/Makefile      | 129 +++++++++---------
 .../linux/aarch64/tst-gcs-audit-skeleton.c    |   2 +-
 time/Makefile                                 |   2 +-
 12 files changed, 110 insertions(+), 93 deletions(-)

-- 
2.47.3