[PATCH bpf-next v2 0/2] Add resolve_btfids support for __arena kfunc suffix

[Kumar Kartikeya Dwivedi <memxor@gmail.com>]

Use __arena/__arena__nullable suffixes to emit address_space(1)
annotations on kfunc definitions in vmlinux.h. See commits for details.

Changelog:
----------
v1 -> v2
v1: https://lore.kernel.org/bpf/20260809085155.3305519-1-memxor@gmail.com

 * Avoid enumerating all the ways resolve_btfids can emit the
   "address_space(1)" attribute in its header comment and in kfuncs.rst.
   (Ihor)
 * Drop the kfunc_has_arena_arg() helper: add_arena_tagged_proto()
   returns the original prototype when nothing needs tagging, so it can
   be invoked unconditionally for every kfunc. (Ihor)
 * Add resolve_btfids selftest cases with mixed tagged and untagged
   arguments, and a kfunc that combines the KF_ARENA_RET flag with
   suffixed arena arguments. (Ihor)

Kumar Kartikeya Dwivedi (2):
  resolve_btfids: Emit arena attributes from kfunc parameter suffixes
  selftests/bpf: Test resolve_btfids arena argument suffixes

 Documentation/bpf/kfuncs.rst                  |  4 +-
 tools/bpf/resolve_btfids/main.c               | 72 +++++++++++++------
 .../selftests/bpf/prog_tests/resolve_btfids.c | 41 ++++++-----
 tools/testing/selftests/bpf/progs/btf_data.c  | 20 ++++++
 4 files changed, 99 insertions(+), 38 deletions(-)


base-commit: 3a59f11e0f989bdd637c87151992605a6559a7cb
-- 
2.53.0