[PATCH v3 0/4] kselftest/arm64: Add coverage for the interaction of vfork() and GCS

[Mark Brown]

I had cause to look at the vfork() support for GCS and realised that we
don't have any direct test coverage, this series does so by adding
vfork() to nolibc and then using that in basic-gcs to provide some
simple vfork() coverage.

Signed-off-by: Mark Brown <broonie at kernel.org>
---
Changes in v3:
- Stylistic nits in the GCS vfork() test.
- SPARC has a non-standard vfork() ABI which needs handling.
- Link to v2: https://lore.kernel.org/r/20250610-arm64-gcs-vfork-exit-v2-0-929443dfcf82@kernel.org

Changes in v2:
- Add replacement of ifdef with if defined() in nolibc since the code
  doesn't reflect the coding style.
- Remove check for arch specific vfork().
- Link to v1: https://lore.kernel.org/r/20250609-arm64-gcs-vfork-exit-v1-0-baad0f085747@kernel.org

---
Mark Brown (4):
      tools/nolibc: Replace ifdef with if defined() in sys.h
      tools/nolibc: Provide vfork()
      kselftest/arm64: Add a test for vfork() with GCS
      selftests/nolibc: Add coverage of vfork()

 tools/include/nolibc/arch-sparc.h             | 16 +++++++
 tools/include/nolibc/sys.h                    | 59 ++++++++++++++++++-------
 tools/testing/selftests/arm64/gcs/basic-gcs.c | 63 +++++++++++++++++++++++++++
 tools/testing/selftests/nolibc/nolibc-test.c  | 23 ++++++++--
 4 files changed, 142 insertions(+), 19 deletions(-)
---
base-commit: 86731a2a651e58953fc949573895f2fa6d456841
change-id: 20250528-arm64-gcs-vfork-exit-4a7daf7652ee

Best regards,
--  
Mark Brown <broonie at kernel.org>