73f399414a84d715bb1794182aaea852b11d0962 - Merge tag 'kbuild-7.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux

Mon, 15 Jun 2026 01:31:15 +0200

Merge tag 'kbuild-7.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linuxPull Kbuild / Kconfig updates from Nathan Chancellor: "Kbuild: - Remove broken module linking exclusion for BTF - Add documentation around how offset header files work - Include unstripped vDSO libraries in pacman packages - Bump minimum version of LLVM for building the kernel to 17.0.1 and clean up unnecessary workarounds - Use a context manager in run-clang-tools - Add dist macro value if present to release tag for RPM packages - Detect and report truncated buf_printf() output in modpost - Add __llvm_covfun and __llvm_covmap to section whitelist in modpost - Support Clang's distributed ThinLTO mode - Remove architecture specific configurations for AutoFDO and Propeller to ease individual architecture maintenance Kconfig: - Add kconfig-sym-check target to look for dangling Kconfig symbol references and invalid tristate literal values - Harden against potential NULL pointer dereference - Fix typo in Kconfig test comment"* tag 'kbuild-7.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux: (31 commits) kconfig: tests: fix typo in comment kconfig: Remove the architecture specific config for Propeller kconfig: Remove the architecture specific config for AutoFDO modpost: Add __llvm_covfun and __llvm_covmap to section_white_list kconfig: add kconfig-sym-check static checker kbuild: Remove unnecessary 'T' modifier in cmd_ar_builtin_fixup kbuild: distributed build support for Clang ThinLTO kbuild: move vmlinux.a build rule to scripts/Makefile.vmlinux_a scripts: modpost: detect and report truncated buf_printf() output kbuild: rpm-pkg: append %{?dist} macro to Release tag run-clang-tools: run multiprocessing.Pool as context manager compiler-clang.h: Drop explicit version number from "all" diagnostic macro compiler-clang.h: Remove __cleanup -Wunused-variable workaround kbuild: Remove check for broken scoping with clang < 17 in CC_HAS_ASM_GOTO_OUTPUT x86/entry/vdso32: Remove conditional omission of '.cfi_offset eflags' x86/module: Revert "Deal with GOT based stack cookie load on Clang < 17" x86/build: Drop unnecessary '-ffreestanding' addition to KBUILD_CFLAGS scripts/Makefile.warn: Drop -Wformat handling for clang < 16 riscv: Drop tautological condition from TOOLCHAIN_NEEDS_OLD_ISA_SPEC riscv: Remove tautological condition from selection of ARCH_SUPPORTS_CFI ... List of files: /linux/scripts/Makefile.thinlto

9f2aee8f7d1842be08da860e45265d30dba0d1f7 - kbuild: distributed build support for Clang ThinLTO

Fri, 29 May 2026 20:53:46 +0200

kbuild: distributed build support for Clang ThinLTOAdd distributed ThinLTO build support for the Linux kernel.This new mode offers several advantages: (1) Increasedflexibility in handling user-specified build options.(2) Improved user-friendliness for developers. (3) Greaterconvenience for integrating with objtool and livepatch.Note that "distributed" in this context refers to a termthat differentiates in-process ThinLTO builds by invokingbackend compilation through the linker, not necessarilybuilding in distributed environments.Distributed ThinLTO is enabled via the`CONFIG_LTO_CLANG_THIN_DIST` Kconfig option. For example: > make LLVM=1 defconfig > scripts/config -e LTO_CLANG_THIN_DIST > make LLVM=1 oldconfig > make LLVM=1 vmlinux -j <..>The build flow proceeds in four stages: 1. Perform FE compilation, mirroring the in-process ThinLTO mode. 2. Thin-link the generated IR files and object files. 3. Find all IR files and perform BE compilation, using the flags stored in the .*.o.cmd files. 4. Link the BE results to generate the final vmlinux.o.NOTE: This patch currently implements the build for the main kernelimage (vmlinux) only. Kernel module support is planned for asubsequent patch.Tested on the following arch: x86, arm64, loongarch, andriscv.The earlier implementation details can be found here:https://discourse.llvm.org/t/rfc-distributed-thinlto-build-for-kernel/85934Signed-off-by: Rong Xu Co-developed-by: Masahiro Yamada Signed-off-by: Masahiro Yamada Tested-by: Piotr Gorski Tested-by: Nathan Chancellor Link: https://patch.msgid.link/20260529185347.2418373-4-xur@google.comSigned-off-by: Nathan Chancellor List of files: /linux/scripts/Makefile.thinlto

Changes in Makefile.thinlto

73f399414a84d715bb1794182aaea852b11d0962 - Merge tag 'kbuild-7.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux

9f2aee8f7d1842be08da860e45265d30dba0d1f7 - kbuild: distributed build support for Clang ThinLTO