linux-kernel - Re: [PATCH] printk: CON_PRINTBUFFER console registration is a bit racy

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Message-ID: <20180914111953.GA20572@tigerII.localdomain>
Date:   Fri, 14 Sep 2018 20:19:53 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [PATCH] printk: CON_PRINTBUFFER console registration is a bit
 racy

On (09/14/18 10:59), Petr Mladek wrote:
> 
> Well, I am not sure if it is worth the code complexity.
>

Well, I don't think we need to bother that much here. Besides,
exclusive_console is cleared under logbuf_lock with preemption
disabled now. So we set it under logbuf_lock and !irq and we
clear it under logbuf_lock and !irq. Looks quite OK to me.

	-ss