From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-177.mta1.migadu.com (out-177.mta1.migadu.com [95.215.58.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C1D1534DB6F for ; Fri, 19 Dec 2025 18:13:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.177 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766168042; cv=none; b=ebshiTFnzXVd38AwQSInt6QDUPnHARunJlYwDj8/tj1C49bs1VboIQRTVoj9l47RoVmyf7dxOJ4hdLIu8TQJpWjjNyKEFMrqmyO+U+KnTbO55Zjp+J8T2fcEttQSuY3Lui3QTj52MAu4kOOel92K1v94wZ2KJu4J+Trf98Glq00= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766168042; c=relaxed/simple; bh=f/9WlNlDvz+RKHyGglF9xjnqFIM7fG1mPMblYNc71Co=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=dTZU9hRs+GGD+GF1ZVZ5+FQjRLcegGTsHMLwtKIAeDBoq7L2oCy8h6Wsg/NF2TsOqOjLl18EodP5jfFYJfygrrs+Gp31Yfj/1FhPlDDAR3xAp6w/RSpJpYqts+aNwiAh2mJT017OF8U/ss0qACj7lGTvwlsBAE7swV+HQhUc4qI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=Pi5swshZ; arc=none smtp.client-ip=95.215.58.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="Pi5swshZ" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1766168027; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=g55rWkJhqcFv/045X8ZtuPxRw3uqQmw2iX5kyd0Ox7A=; b=Pi5swshZeWnVNqAAVpLb3YZ3HVInI3m4X1vguYx1rowuoBCy7K5Pt8Dl2rHE7CEi4xQYd/ +oaoZk32YDnx5mN2SSypcAVEnfggLKi60njoA0SZMN8c/XKDQ7Aj9K15u4esyavO+XyRy/ YqpRa1Xpgwn9Gl7SY+Vx1I3K9sLQBHE= From: Ihor Solodrai To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Andrew Morton , Nathan Chancellor , Nicolas Schier , Jonathan Corbet , Tejun Heo , David Vernet , Andrea Righi , Changwoo Min , Shuah Khan , Nick Desaulniers , Bill Wendling , Justin Stitt , Alan Maguire , Donglin Peng Cc: bpf@vger.kernel.org, dwarves@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, sched-ext@lists.linux.dev Subject: [PATCH bpf-next v7 0/8] resolve_btfids: Support for BTF modifications Date: Fri, 19 Dec 2025 10:13:13 -0800 Message-ID: <20251219181321.1283664-1-ihor.solodrai@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT 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-#4 in the series are non-functional changes in resolve_btfids. Patch #5 makes kernel build notice pahole version changes between builds. Patch #6 changes minimum version of pahole required for CONFIG_DEBUG_INFO_BTF to v1.22 Patch #7 makes a small prep change in selftests/bpf build. The last patch (#8) makes significant changes in resolve_btfids and introduces scripts/gen-btf.sh. See implementation details in the patch description. Successful BPF CI run: https://github.com/kernel-patches/bpf/actions/runs/20378061470 [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/ --- v6->v7: - documentation edits in patches #5 and #6 (Nicolas) v6: https://lore.kernel.org/bpf/20251219020006.785065-1-ihor.solodrai@linux.dev/ v5->v6: - patch #8: fix double free when btf__distill_base fails (reported by AI) https://lore.kernel.org/bpf/e269870b8db409800045ee0061fc02d21721e0efadd99ca83960b48f8db7b3f3@mail.kernel.org/ v5: https://lore.kernel.org/bpf/20251219003147.587098-1-ihor.solodrai@linux.dev/ v4->v5: - patch #3: fix an off-by-one bug (reported by AI) https://lore.kernel.org/bpf/106b6e71bce75b8f12a85f2f99e75129e67af7287f6d81fa912589ece14044f9@mail.kernel.org/ - patch #8: cleanup GEN_BTF in Makefile.btf v4: https://lore.kernel.org/bpf/20251218003314.260269-1-ihor.solodrai@linux.dev/ v3->v4: - add patch #4: "resolve_btfids: Always build with -Wall -Werror" - add patch #5: "kbuild: Sync kconfig when PAHOLE_VERSION changes" (Alan) - fix clang cross-compilation (LKP) https://lore.kernel.org/bpf/cecb6351-ea9a-4f8a-863a-82c9ef02f012@linux.dev/ - remove GEN_BTF env variable (Andrii) - nits and cleanup in resolve_btfids/main.c (Andrii, Eduard) - nits in a patch bumping minimum pahole version (Andrii, AI) v3: https://lore.kernel.org/bpf/20251205223046.4155870-1-ihor.solodrai@linux.dev/ v2->v3: - add patch #4 bumping minimum pahole version (Andrii, Alan) - add patch #5 pre-fixing resolve_btfids test (Donglin) - add GEN_BTF var and assemble RESOLVE_BTFIDS_FLAGS in Makefile.btf (Alan) - implement --distill_base flag in resolve_btfids, set it depending on KBUILD_EXTMOD in Makefile.btf (Eduard) - various implementation nits, see the v2 thread for details (Andrii, Eduard) v2: https://lore.kernel.org/bpf/20251127185242.3954132-1-ihor.solodrai@linux.dev/ 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 (8): resolve_btfids: Rename object btf field to btf_path resolve_btfids: Factor out load_btf() resolve_btfids: Introduce enum btf_id_kind resolve_btfids: Always build with -Wall -Werror kbuild: Sync kconfig when PAHOLE_VERSION changes lib/Kconfig.debug: Set the minimum required pahole version to v1.22 selftests/bpf: Run resolve_btfids only for relevant .test.o objects resolve_btfids: Change in-place update with raw binary output Documentation/process/changes.rst | 4 +- Documentation/scheduler/sched-ext.rst | 1 - MAINTAINERS | 1 + Makefile | 15 +- init/Kconfig | 2 +- lib/Kconfig.debug | 13 +- scripts/Makefile.btf | 21 +- scripts/Makefile.modfinal | 5 +- scripts/Makefile.vmlinux | 2 +- scripts/gen-btf.sh | 157 ++++++++ scripts/link-vmlinux.sh | 42 +- tools/bpf/resolve_btfids/Makefile | 3 +- tools/bpf/resolve_btfids/main.c | 358 ++++++++++++------ tools/sched_ext/README.md | 1 - tools/testing/selftests/bpf/.gitignore | 3 + tools/testing/selftests/bpf/Makefile | 11 +- .../selftests/bpf/prog_tests/resolve_btfids.c | 4 +- 17 files changed, 448 insertions(+), 195 deletions(-) create mode 100755 scripts/gen-btf.sh -- 2.52.0