Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Date:   Thu, 21 May 2020 13:32:09 +0900
To:     Joe Perches <joe@perches.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Chenggang Wang <wangchenggang@vivo.com>,
        linux-kernel@vger.kernel.org, Petr Mladek <pmladek@suse.com>,
        Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [RFC PATCH 2/2] init: Allow multi-line output of kernel command
 line
Message-ID: <20200521043209.GA755@jagdpanzerIV.localdomain>
References: <cover.1589916689.git.joe@perches.com>
 <2b3832fed9370f0f8dfd1ea33dddb1d05a36e265.1589916689.git.joe@perches.com>
 <20200520044127.GB938@jagdpanzerIV.localdomain>
 <ae3aff79301c130aa15b3fe0ff801804bb019384.camel@perches.com>
 <20200520121000.GF520@jagdpanzerIV.localdomain>
 <19a8c717f8d9dc76f2b09e6dd19f3fbb71bf29c5.camel@perches.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <19a8c717f8d9dc76f2b09e6dd19f3fbb71bf29c5.camel@perches.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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