linux-kernel - Re: [PATCH 1/2] printk: nbcon: move locked_port flag to struct uart

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Date: Wed, 24 Jan 2024 11:05:24 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: John Ogness <john.ogness@...utronix.de>
Cc: Junxiao Chang <junxiao.chang@...el.com>, tglx@...utronix.de,
	rostedt@...dmis.org, linux-kernel@...r.kernel.org,
	hao3.li@...el.com, lili.li@...el.com, jianfeng.gao@...el.com,
	linux-rt-users@...r.kernel.org
Subject: Re: [PATCH 1/2] printk: nbcon: move locked_port flag to struct
 uart_port

On 2024-01-24 10:53:10 [+0106], John Ogness wrote:
> On 2024-01-23, Junxiao Chang <junxiao.chang@...el.com> wrote:
> > Console pointer in uart_port might be shared among multiple uart
> > ports.
> 
> I still want to investigate why the pointer is shared. This sounds
> sloppy or dangerous.

I have x86 a server box and PNP enumerates two UARTs (8250). Only one is
wired up but both can be specified as console=.
What do I need to do to reproduce this here? Using console= twice does
not do the trick.

Sebastian