Re: [PATCH v3 0/6] bootconfig: embed kernel.* cmdline at build time

[Breno Leitao]

On Tue, Jun 09, 2026 at 10:46:11AM +0900, Masami Hiramatsu wrote:
> On Mon, 08 Jun 2026 09:23:57 -0700
> Breno Leitao <leitao@xxxxxxxxxx> 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.
> > 
> 
> Sashiko still leaves some comments. 
> https://sashiko.dev/#/patchset/20260608-bootconfig_using_tools-v3-0-4ddd079a0696%40debian.org

Ack. There are two "low" issues and one high. I will fix all of them in
v4.

> BTW, can you also update the document (Documentation/admin-guide/bootconfig.rst)
> about what is the expected behavior of this feature (kconfigs, examples)?

Sure, good idea. I will add a new patch documenting this new feature.


Thanks for the review,
--breno