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Merge branch 'resolve_btfids-support-for-btf-modifications'
Ihor Solodrai says: ==================== 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-#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/ ==================== Link: https://patch.msgid.link/20251219181321.1283664-1-ihor.solodrai@linux.dev Signed-off-by:Andrii Nakryiko <andrii@kernel.org>