Changes in embedded-cmdline.S

67f8bc848ee31831336bd478e57d2f993551902e - Merge drm/drm-fixes into drm-misc-fixes

Tue, 01 Sep 2026 09:38:51 +0200

Merge drm/drm-fixes into drm-misc-fixesLet's start the 7.3 drm-misc-fixes cycle.Signed-off-by: Maxime Ripard List of files: /linux/lib/embedded-cmdline.S

5f5ef9c407cfdc524a1aaeb4196d933f61ecf21a - Merge tag 'bootconfig-v7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Tue, 25 Aug 2026 17:59:09 +0200

Merge tag 'bootconfig-v7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracePull bootconfig updates from Masami Hiramatsu: - Support build-time command line building for embedded bootconfig - Fix xbc_snprint_cmdline() to render descendant keys when the root has both a value and subkeys, and treats empty subtrees correctly. - Add build-time pipeline using tools/bootconfig -C to render the embedded bootconfig "kernel" subtree into .init.rodata as a cmdline string. - Clean build-time tools/bootconfig from make clean - Add helper to prepend embedded bootconfig cmdline into boot_command_line early before parse_early_param() - Wire early prepend helper in x86 setup_arch() so early_param handlers see values from the embedded bootconfig (currently x86 only) - Avoid duplicating "kernel" keys in setup_boot_config() - Refactor setup_boot_config() to share bootconfig_cmdline_requested() - Document CONFIG_CMDLINE_FROM_BOOTCONFIG usage, requirements, and precedence* tag 'bootconfig-v7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: init/main.c: use bootconfig_cmdline_requested() for the runtime opt-in bootconfig: skip runtime kernel.* render once prepended early x86/setup: prepend embedded bootconfig cmdline before parse_early_param Documentation: bootconfig: document build-time cmdline rendering bootconfig: add xbc_prepend_embedded_cmdline() helper bootconfig: clean build-time tools/bootconfig from make clean bootconfig: render embedded bootconfig as a kernel cmdline at build time bootconfig: render descendant keys when xbc_snprint_cmdline() root has a value List of files: /linux/lib/embedded-cmdline.S

fc9d90470463f165a95becbfbad21795fd9752bd - bootconfig: render embedded bootconfig as a kernel cmdline at build time

Thu, 02 Jul 2026 14:15:45 +0200

bootconfig: render embedded bootconfig as a kernel cmdline at build timeAdd the build-time pipeline that renders the "kernel" subtree ofCONFIG_BOOT_CONFIG_EMBED_FILE into a flat cmdline string and stashesit in .init.rodata as embedded_kernel_cmdline[]. A follow-up patchadds the runtime helper that prepends this string to boot_command_lineduring early architecture setup so parse_early_param() sees the values.The build wires up: tools/bootconfig -C kernel - userspace tool already shared with lib/bootconfig.c, used here in -C mode to render a bootconfig file to a cmdline lib/embedded-cmdline.S - .incbin's the rendered text plus a NUL (listed under the EXTRA BOOT CONFIG MAINTAINERS entry) lib/Makefile rule - runs tools/bootconfig at build time Makefile prepare dep - ensures tools/bootconfig is built first, same pattern as tools/objtool and tools/bpf/resolve_btfidsDrop the test target from tools/bootconfig/Makefile's default 'all'recipe so that hooking the binary into the kernel build does not runtest-bootconfig.sh on every prepare. The tests stay available as'make -C tools/bootconfig test', matching the convention oftools/objtool and tools/bpf/resolve_btfids whose 'all' targets onlybuild the binary.Require BOOT_CONFIG_EMBED_FILE to be non-empty before the new optioncan be enabled, otherwise tools/bootconfig -C runs against an emptyfile and prints a parse error on every kernel build.The feature gates on CONFIG_ARCH_SUPPORTS_CMDLINE_FROM_BOOTCONFIG, asilent symbol arches select once they've wired the prepend call intosetup_arch(). No arch selects it in this patch, so the user-visibleCONFIG_CMDLINE_FROM_BOOTCONFIG is not yet enableable; when an archlater opts in, the runtime behavior is added by the follow-up patches.tools/bootconfig also installs on target systems, so its own Makefilekeeps $(CC) and stays cross-buildable as a standalone tool. The kernelbuild, which runs the tool on the build host during prepare, insteadforces CC=$(HOSTCC) from a dedicated tools/bootconfig rule and clearsCROSS_COMPILE= in the sub-make. Without that clear, an LLVM=1 crossbuild would inherit CROSS_COMPILE and tools/scripts/Makefile.includewould inject --target=/--sysroot= flags into the host clang invocation,producing a target binary that fails to exec ("Exec format error").embedded-cmdline.S places the rendered string in its own .init.rodatasubsection (.init.rodata.embed_cmdline) with the "a" (allocatable,read-only) flag and %progbits. lib/bootconfig-data.S already placesthe embedded bootconfig blob in .init.rodata with the "aw" flag(xbc_init() rewrites separators in place, so that data must bewritable). Using a distinct subsection name avoids the ld.lld section-type mismatch that would otherwise arise from mixing "a" and "aw"under the same name; the linker's "*(.init.rodata .init.rodata.*)"glob still folds both into the init image and frees them after boot.A follow-up patch wires the build-time tools/bootconfig into thetop-level clean target.Link: https://lore.kernel.org/all/20260626-bootconfig_using_tools-v7-3-24ab72139c29@debian.org/Reviewed-by: Nicolas Schier Signed-off-by: Breno Leitao Signed-off-by: Masami Hiramatsu (Google) List of files: /linux/lib/embedded-cmdline.S