From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-171.mta0.migadu.com (out-171.mta0.migadu.com [91.218.175.171]) (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 08EC413B284; Thu, 18 Dec 2025 00:34:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.171 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766018058; cv=none; b=nzZkMg6hGTFL9WWi894rPyiMUf6VJtKuNI7tj7/JNeB83OBh5LhNiOswohspK6XtiupHMJRvXgK3DeB59NPgbGWw0cEnGWPXrCoMU66WAEs8c1Jc4ElTzm+NHgLErTCVFMnSfMom1eN+duRXZFlbg7W7HZErk/tYv5kD2pDWWM4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766018058; c=relaxed/simple; bh=1H7v1yEOBd89QHThU8DOQ3A3hil6GVRheNxYDdBj7FA=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=RQewVUHzbbNbBSf6yPzmdsNJ/qNvNDUaqR7UzhLHZHR0YA+QToXbQEgrXbmXmdlM3V9RWWnngOo3JAs+WfD47IxCmxUPeVujcy+rnljtgUuP1okklFE01Fja2Ed0bl/PTcBhF9cw7jXYoaL8wMqqjkUMd8esBV7OhSzlsj32rvk= 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=P6/LZ+vi; arc=none smtp.client-ip=91.218.175.171 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="P6/LZ+vi" 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=1766018042; 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=Jjxg0msd0wrwT+/IAP3o4OvO/U5BQ2+j/m+JCjRvBu8=; b=P6/LZ+viF/VEuxUulJNKQqLmvOLbXIqTf1RDBGv2zgbiMET1VwJLeSWgU4tQiEUYX2xvTJ ttnm14orKHQ7Eolubo9UoAyebEA2Z2FXn9q9zl1Mee73uAyYXi+9fxYEoF3Bnm/QV6eqsX 5Ztl9KRVsasT/7iMEA0HQGM3YTxLQOI= From: Ihor Solodrai To: Alan Maguire , Alexei Starovoitov , Andrea Righi , Andrew Morton , Andrii Nakryiko , Bill Wendling , Changwoo Min , Daniel Borkmann , David Vernet , Donglin Peng , Eduard Zingerman , Hao Luo , Jiri Olsa , John Fastabend , Jonathan Corbet , Justin Stitt , KP Singh , Martin KaFai Lau , Nathan Chancellor , Nick Desaulniers , Nicolas Schier , Shuah Khan , Song Liu , Stanislav Fomichev , Tejun Heo , Yonghong Song Cc: bpf@vger.kernel.org, dwarves@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, sched-ext@lists.linux.dev Subject: [PATCH bpf-next v4 0/8] resolve_btfids: Support for BTF modifications Date: Wed, 17 Dec 2025 16:33:06 -0800 Message-ID: <20251218003314.260269-1-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/20321339588 [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/ --- 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/scheduler/sched-ext.rst | 1 - MAINTAINERS | 1 + Makefile | 9 +- init/Kconfig | 2 +- lib/Kconfig.debug | 13 +- scripts/Makefile.btf | 26 +- 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 | 356 ++++++++++++------ 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 +- 16 files changed, 446 insertions(+), 190 deletions(-) create mode 100755 scripts/gen-btf.sh -- 2.52.0