linux-kernel - Re: [PATCH] bootconfig: Update prototype of setup_boot

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Message-Id: <20210312111026.a29a97de021aee0ff279850c@kernel.org>
Date:   Fri, 12 Mar 2021 11:10:26 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Cao jin <jojing64@...il.com>, linux-kernel@...r.kernel.org,
        mhiramat@...nel.org, akpm@...ux-foundation.org,
        keescook@...omium.org, vbabka@...e.cz
Subject: Re: [PATCH] bootconfig: Update prototype of setup_boot_config()

On Thu, 11 Mar 2021 09:03:21 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Thu, 11 Mar 2021 16:52:13 +0800
> Cao jin <jojing64@...il.com> wrote:
> 
> > Parameter "cmdline" has no use, drop it.
> 
> Actually, I wonder if it should be using that instead of boot_command_line,
> as the cmdline passed in is boot_command_line plus anything that the
> architecture itself modified.
> 
> Masami?

I think the policy is that boot_command_line is the reference command line 
string passed from user, and the passed cmdline is modified by architecutre code.
But those are usually same in most cases, because boot_command_line was also
modified in setup_arch().

For example, x86 setup_arch() overwrites/modifies boot_command_line itself
by builtin_cmdline, and copy boot_command_line into the passed cmdline.

Thank you,

-- 
Masami Hiramatsu <mhiramat@...nel.org>