Merge branch 'resolve_btfids-discover-kfuncs-from-btf-id-sets'

Ihor Solodrai says:

====================
resolve_btfids: Discover kfuncs from BTF ID sets

This series develops resolve_btfids in preparation for bringing
kernel-specific BTF transformations in tree, which will reduce kbuild
dependency on pahole's features.

resolve_btfids currently identifies kfuncs by reading the "bpf_kfunc"
decl tags pahole emits into vmlinux BTF. The series switches the
source of truth to the BTF ID sets registered with
BTF_KFUNCS_START()/END() in the kernel, which is the mechanism BPF
verifier uses.

The series is based on patches #5 and #6 from the original
"resolve_btfids: Implement BTF tags emission for kfuncs" series [1],
and includes a few significant additions. Particularly the build time
enforcement of kfunc flags consistency [2].

The series consists of:
  - patches #1-#3 implement supporting infrastructure for the proper
    kfunc discovery and deduplication
  - patches #4-#5 expose btf__find_by_name_kind_own() and use it to
    fix a latent bug in _impl func lookup
  - patch #6 fixes inconsistent kfunc flags for HID kfuncs
  - patch #7 implements kfunc discovery from BTF ID sets
  - patch #8 adds enforcement of kfunc flags consistency

The resolve_btfids selftests patches have landed earlier [3].

[1] https://lore.kernel.org/bpf/20260601221805.821394-1-ihor.solodrai@linux.dev/
[2] https://lore.kernel.org/bpf/9b2196dd-443b-4632-ae11-030cdbdc59b4@linux.dev/
[3] https://lore.kernel.org/bpf/20260617210619.1562858-1-ihor.solodrai@linux.dev/
Tested-by: Alan Maguire <alan.maguire@oracle.com>
---

Changes compared to [1]:
  - Drop the idempotency (ensure_*) machinery: assume valid input BTF (Andrii)
  - Use rbtree to store the kfuncs (Andrii)
  - Enforce full KF_* flag consistency as a build error (Eduard)
  - Various cleanups and nits (Andrii, Emil, Jiri)

---
====================

Link: https://patch.msgid.link/20260722233518.778854-1-ihor.solodrai@linux.dev
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

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