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

Browse source

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>

...

This commit is contained in:

Andrii Nakryiko 2026-07-30 12:48:13 -07:00

parent fdec474c65 140a3479ef

commit 2659f94ed3

5 changed files with 181 additions and 109 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

10

drivers/hid/bpf/hid_bpf_dispatch.c

View file

279

tools/bpf/resolve_btfids/main.c

View file

2

tools/lib/bpf/btf.h

View file

1

tools/lib/bpf/libbpf.map

View file

2

tools/lib/bpf/libbpf_internal.h

View file