[PATCH RESEND bpf-next v3 0/6] selftests/bpf: libarena cleanup and bitmap struct

[Emil Tsalapatis <emil@etsalapatis.com>]

Cleanup patches for libarena, along with a new bitmap data type that is
in use by sched-ext. Patch 1 is an NFC that properly renames the buddy
selftests for consistency. Patch 2 fixes the zero variable used in
libarena for can_loop based looping, and afterwrds removes all bpf_for()
instances from the code. Patch 3 fixes an (untriggered) edge case that 
could cause spurious selftest failures. Finally, patches 4 to 6
introduce the bitmap data structure along with selftests.

Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>

CHANGELOG
=========

v3 was resent as the first submission was missing the first patch.

v2 -> v3: (https://lore.kernel.org/bpf/20260701185235.4516-1-emil@etsalapatis.com)
- Remove unused macros and fix typo in commit message (AI)

v1 -> v2: (https://lore.kernel.org/bpf/20260618085626.19633-1-emil@etsalapatis.com)

- Added acks by Ihor and Eduard
- Fix missing commit message (Ihor)
- Enforce 64 bits per cell with BITS_TO_LONG_LONG (Sashiko)
- Add test for bmp_copy (Ihor)
- Add atomic versions of _set() and _clear() (Ihor) and add a parallel
  selftest for them.


Emil Tsalapatis (6):
  selftests/bpf: libarena: Replace leftover st_ prefix with test_
  selftests/bpf: libarena: Fix can-loop zero variable definition
  selftests/bpf: libarena: Clean up allocation state before buddy tests
  selftests/bpf: Add arena-based bitmap data structure
  selftests/bpf: libarena: Add bitmap selftests
  selftests/bpf: libarena: Add parallel bitmap selftest

 .../bpf/libarena/include/libarena/bitmap.h    |  34 ++
 .../bpf/libarena/include/libarena/common.h    |   2 +-
 ...asan_buddy.bpf.c => test_asan_buddy.bpf.c} |  10 +-
 .../{st_asan_common.h => test_asan_common.h}  |   0
 .../bpf/libarena/selftests/test_bitmap.bpf.c  | 394 ++++++++++++++++++
 .../{st_buddy.bpf.c => test_buddy.bpf.c}      |   8 +-
 .../selftests/test_parallel_bitmap.bpf.c      | 190 +++++++++
 .../selftests/test_parallel_spmc.bpf.c        |   9 +-
 .../selftests/bpf/libarena/src/bitmap.bpf.c   | 245 +++++++++++
 .../selftests/bpf/libarena/src/common.bpf.c   |   9 +-
 .../selftests/bpf/prog_tests/libarena.c       |   8 +-
 .../selftests/bpf/prog_tests/libarena_asan.c  |   8 +-
 12 files changed, 900 insertions(+), 17 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/libarena/include/libarena/bitmap.h
 rename tools/testing/selftests/bpf/libarena/selftests/{st_asan_buddy.bpf.c => test_asan_buddy.bpf.c} (98%)
 rename tools/testing/selftests/bpf/libarena/selftests/{st_asan_common.h => test_asan_common.h} (100%)
 create mode 100644 tools/testing/selftests/bpf/libarena/selftests/test_bitmap.bpf.c
 rename tools/testing/selftests/bpf/libarena/selftests/{st_buddy.bpf.c => test_buddy.bpf.c} (97%)
 create mode 100644 tools/testing/selftests/bpf/libarena/selftests/test_parallel_bitmap.bpf.c
 create mode 100644 tools/testing/selftests/bpf/libarena/src/bitmap.bpf.c

-- 
2.54.0