linux-kernel - Re: [RFC PATCH 2/2] init: Allow multi-line output of kernel command line

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Date:   Thu, 21 May 2020 13:32:09 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Chenggang Wang <wangchenggang@...o.com>,
        linux-kernel@...r.kernel.org, Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [RFC PATCH 2/2] init: Allow multi-line output of kernel command
 line

On (20/05/20 13:36), Joe Perches wrote:
> > We can split command line in a loop - memchr(pos, ' ') - and
> > pr_cont() parts of the command line. pr_cont() has overflow
> > control and it flushes cont buffer before it overflows, so
> > we should not lose anything.
> 
> It doesn't matter much here, but I believe
> there's an 8k max buffer for pr_cont output.
> 
> include/linux/printk.h:#define CONSOLE_EXT_LOG_MAX      8192

This is for extended payload - the key:value dictionaries
which device core appends to normal printk() messages. We
don't have that many consoles that handle extended output
(netcon and, maybe, a few more).

	-ss