linux-kernel - Re: [PATCH printk v3 36/40] tty: serial: kgdboc: use console_list

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Date:   Wed, 09 Nov 2022 10:50:43 +0106
From:   John Ogness <john.ogness@...utronix.de>
To:     Daniel Thompson <daniel.thompson@...aro.org>
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org,
        Jason Wessel <jason.wessel@...driver.com>,
        Douglas Anderson <dianders@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        kgdb-bugreport@...ts.sourceforge.net, linux-serial@...r.kernel.org
Subject: Re: [PATCH printk v3 36/40] tty: serial: kgdboc: use
 console_list_lock for list traversal

On 2022-11-09, Daniel Thompson <daniel.thompson@...aro.org> wrote:
>> @@ -463,9 +476,14 @@ static void kgdboc_earlycon_pre_exp_handler(void)
>>  	 * serial drivers might be OK with this, print a warning once per
>>  	 * boot if we detect this case.
>>  	 */
>> -	for_each_console(con)
>> +	cookie = console_srcu_read_lock();
>> +	for_each_console_srcu(con) {
>>  		if (con == kgdboc_earlycon_io_ops.cons)
>> -			return;
>> +			break;
>> +	}
>> +	console_srcu_read_unlock(cookie);
>> +	if (con)
>> +		return;
>
> This change isn't mentioned in the patch description.

I will move this change into its own separate patch.

    tty: serial: kgdboc: use srcu console list iterator

    Use srcu console list iteration for safe console list traversal.

Thanks.

John