From: Breno Leitao <leitao@debian.org>
To: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Nathan Chancellor <nathan@kernel.org>,
paulmck@kernel.org, Nicolas Schier <nsc@kernel.org>,
Nick Desaulniers <nick.desaulniers+lkml@gmail.com>,
Bill Wendling <morbo@google.com>,
Justin Stitt <justinstitt@google.com>,
Jonathan Corbet <corbet@lwn.net>,
Shuah Khan <skhan@linuxfoundation.org>,
Thomas Gleixner <tglx@kernel.org>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
linux-kernel@vger.kernel.org,
linux-trace-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org,
bpf@vger.kernel.org, llvm@lists.linux.dev,
linux-doc@vger.kernel.org, kernel-team@meta.com,
Nicolas Schier <n.schier@fritz.com>
Subject: Re: [PATCH v7 0/9] bootconfig: embed kernel.* cmdline at build time
Date: Fri, 26 Jun 2026 07:53:45 -0700 [thread overview]
Message-ID: <aj6SZrtZb6rfQUJZ@gmail.com> (raw)
In-Reply-To: <20260626233327.b5c9c8de494acdde4ddf5c02@kernel.org>
On Fri, Jun 26, 2026 at 11:33:27PM +0900, Masami Hiramatsu 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 for update!! This looks good to me.
> Let me pick it and test it.
This is great. Thanks for it and for the support so far.
--breno
prev parent reply other threads:[~2026-06-26 14:54 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-26 12:50 [PATCH v7 0/9] bootconfig: embed kernel.* cmdline at build time Breno Leitao
2026-06-26 12:50 ` [PATCH v7 1/9] bootconfig: fix NULL-pointer arithmetic in xbc_snprint_cmdline() Breno Leitao
2026-06-26 12:50 ` [PATCH v7 2/9] bootconfig: render descendant keys when xbc_snprint_cmdline() root has a value Breno Leitao
2026-06-26 12:50 ` [PATCH v7 3/9] bootconfig: render embedded bootconfig as a kernel cmdline at build time Breno Leitao
2026-06-26 13:04 ` sashiko-bot
2026-06-26 12:50 ` [PATCH v7 4/9] bootconfig: clean build-time tools/bootconfig from make clean Breno Leitao
2026-06-26 12:50 ` [PATCH v7 5/9] bootconfig: add xbc_prepend_embedded_cmdline() helper Breno Leitao
2026-06-26 12:50 ` [PATCH v7 6/9] Documentation: bootconfig: document build-time cmdline rendering Breno Leitao
2026-06-26 12:50 ` [PATCH v7 7/9] x86/setup: prepend embedded bootconfig cmdline before parse_early_param Breno Leitao
2026-06-26 12:50 ` [PATCH v7 8/9] bootconfig: skip runtime kernel.* render once prepended early Breno Leitao
2026-06-26 12:50 ` [PATCH v7 9/9] init/main.c: use bootconfig_cmdline_requested() for the runtime opt-in Breno Leitao
2026-06-26 14:33 ` [PATCH v7 0/9] bootconfig: embed kernel.* cmdline at build time Masami Hiramatsu
2026-06-26 14:53 ` Breno Leitao [this message]
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