Merge branch 'selftests-bpf-libarena-cleanup-and-bitmap-struct'

Emil Tsalapatis says:

====================
selftests/bpf: libarena cleanup and bitmap struct

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.
====================

Link: https://patch.msgid.link/20260706181730.21731-1-emil@etsalapatis.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

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