linux-kernel - [PATCH bpf-next v2 0/4] resolve_btfids: Support for BTF modifications

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Message-ID: <20251127185242.3954132-1-ihor.solodrai@linux.dev>
Date: Thu, 27 Nov 2025 10:52:38 -0800
From: Ihor Solodrai <ihor.solodrai@...ux.dev>
To: Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas.schier@...ux.dev>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Alan Maguire <alan.maguire@...cle.com>,
	Donglin Peng <dolinux.peng@...il.com>
Cc: bpf@...r.kernel.org,
	dwarves@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-kbuild@...r.kernel.org
Subject: [PATCH bpf-next v2 0/4] resolve_btfids: Support for BTF modifications

This series changes resolve_btfids and kernel build scripts to enable
BTF transformations in resolve_btfids. Main motivation for enhancing
resolve_btfids is to reduce dependency of the kernel build on pahole
capabilities [1] and enable BTF features and optimizations [2][3]
particular to the kernel.

Patches #1-#3 in the series are non-functional refactoring in
resolve_btfids. The last patch (#4) makes significant changes in
resolve_btfids and introduces scripts/gen-btf.sh. Implementation
changes are described in detail in the patch description.

[1] https://lore.kernel.org/dwarves/ba1650aa-fafd-49a8-bea4-bdddee7c38c9@linux.dev/
[2] https://lore.kernel.org/bpf/20251029190113.3323406-1-ihor.solodrai@linux.dev/
[3] https://lore.kernel.org/bpf/20251119031531.1817099-1-dolinux.peng@gmail.com/

---

v1->v2:
  - gen-btf.sh and other shell script fixes (Donglin)
  - update selftests build (Donglin)
  - generate .BTF.base only when KBUILD_EXTMOD is set (Alan)
  - proper endianness handling for cross-compilation
  - change elf_begin mode from ELF_C_RDWR_MMAP to ELF_C_READ_MMAP_PRIVATE
  - remove compressed_section_fix()
  - nit NULL check in patch #3 (suggested by AI)

v1: https://lore.kernel.org/bpf/20251126012656.3546071-1-ihor.solodrai@linux.dev/

Ihor Solodrai (4):
  resolve_btfids: rename object btf field to btf_path
  resolve_btfids: factor out load_btf()
  resolve_btfids: introduce enum btf_id_kind
  resolve_btfids: change in-place update with raw binary output

 MAINTAINERS                          |   1 +
 scripts/Makefile.modfinal            |   5 +-
 scripts/gen-btf.sh                   | 167 ++++++++++++++
 scripts/link-vmlinux.sh              |  42 +---
 tools/bpf/resolve_btfids/main.c      | 331 +++++++++++++++++----------
 tools/testing/selftests/bpf/Makefile |   5 +
 6 files changed, 395 insertions(+), 156 deletions(-)
 create mode 100755 scripts/gen-btf.sh

-- 
2.52.0