On Wed, 27 May 2026 09:41:33 -0700 Breno Leitao <[email protected]> wrote:
> The userspace pieces (xbc_snprint_cmdline() in lib/, tools/bootconfig -C) > already landed; this series wires the rendered cmdline into the kernel. > > Motivation: today the embedded bootconfig is parsed at runtime, after > parse_early_param() has already run, so early_param() handlers can't > see embedded values. Folding the kernel.* subtree into the cmdline at > build time gives a CONFIG_CMDLINE-equivalent for embedded-bootconfig > users without forcing them to maintain two cmdline sources. > > Behaviorally, the "kernel" subtree is rendered to a flat string at > build time and stashed in .init.rodata. setup_arch() prepends it to > boot_command_line before parse_early_param() runs. Overflow is a soft > error: the helper logs and leaves boot_command_line untouched rather > than panicking, so an oversized embedded bconf cannot brick a boot. > Thanks Breno, yes, that is what I think about. Let me check it. And could you also check Sashiko's comments? https://sashiko.dev/#/patchset/20260527-bootconfig_using_tools-v1-0-b6906a86e7d5%40debian.org Thanks, > Signed-off-by: Breno Leitao <[email protected]> > --- > Breno Leitao (4): > bootconfig: return 0 from xbc_snprint_cmdline() for a leaf root > bootconfig: render embedded bootconfig as a kernel cmdline at build time > bootconfig: add xbc_prepend_embedded_cmdline() helper > x86/setup: prepend embedded bootconfig cmdline before parse_early_param > > Makefile | 5 ++++ > arch/x86/Kconfig | 1 + > arch/x86/kernel/setup.c | 3 +++ > include/linux/bootconfig.h | 7 ++++++ > init/Kconfig | 33 ++++++++++++++++++++++++++ > init/main.c | 19 ++++++++++++--- > lib/Makefile | 16 +++++++++++++ > lib/bootconfig.c | 58 > ++++++++++++++++++++++++++++++++++++++++++++++ > lib/embedded-cmdline.S | 16 +++++++++++++ > tools/bootconfig/Makefile | 2 +- > 10 files changed, 156 insertions(+), 4 deletions(-) > --- > base-commit: e7e28506af98ce4e1059e5ec59334b335c00a246 > change-id: 20260508-bootconfig_using_tools-cfa7aa9d6a5a > > Best regards, > -- > Breno Leitao <[email protected]> > -- Masami Hiramatsu (Google) <[email protected]>
