[PATCH dwarves v4 0/6] btf_encoder: emit type tags for bpf_arena pointers

[Ihor Solodrai <ihor.solodrai@linux.dev>]

This patch series implements emitting appropriate BTF type tags for
argument and return types of kfuncs marked with KF_ARENA_* flags.

For additional context see the description of BPF patch
"bpf: define KF_ARENA_* flags for bpf_arena kfuncs" [1].

The feature depends on recent changes in libbpf [2].

[1] https://lore.kernel.org/bpf/20250206003148.2308659-1-ihor.solodrai@linux.dev/
[2] https://lore.kernel.org/bpf/20250130201239.1429648-1-ihor.solodrai@linux.dev/

v3->v4:
  * Add a patch (#2) replacing compile-time libbpf version checks with
    runtime checks for symbol availablility
  * Add a patch (#3) bumping libbpf submodule commit to latest master
  * Modify "btf_encoder: emit type tags for bpf_arena pointers"
    (#2->#4) to not use compile time libbpf version checks

v2->v3:
  * Nits in patch #1

v1->v2:
  * Rewrite patch #1 refactoring btf_encoder__tag_kfuncs(): now the
    post-processing step is removed entirely, and kfuncs are tagged in
    btf_encoder__add_func().
  * Nits and renames in patch #2
  * Add patch #4 editing man pages

v2: https://lore.kernel.org/dwarves/20250212201552.1431219-1-ihor.solodrai@linux.dev/
v1: https://lore.kernel.org/dwarves/20250207021442.155703-1-ihor.solodrai@linux.dev/

Ihor Solodrai (6):
  btf_encoder: refactor btf_encoder__tag_kfuncs()
  btf_encoder: use __weak declarations of version-dependent libbpf API
  pahole: sync with libbpf mainline
  btf_encoder: emit type tags for bpf_arena pointers
  pahole: introduce --btf_feature=attributes
  man-pages: describe attributes and remove reproducible_build

 btf_encoder.c      | 328 ++++++++++++++++++++++-----------------------
 dwarves.h          |  13 +-
 lib/bpf            |   2 +-
 man-pages/pahole.1 |   7 +-
 pahole.c           |  11 +-
 5 files changed, 188 insertions(+), 173 deletions(-)

-- 
2.48.1