linux-kernel - Re: [PATCH printk v5 10/30] console: Improve console_srcu_read

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Message-ID: <Zkdv3QjzaXUBRg1I@pathway.suse.cz>
Date: Fri, 17 May 2024 16:55:25 +0200
From: Petr Mladek <pmladek@...e.com>
To: John Ogness <john.ogness@...utronix.de>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH printk v5 10/30] console: Improve
 console_srcu_read_flags() comments

On Thu 2024-05-02 23:44:19, John Ogness wrote:
> It was not clear when exactly console_srcu_read_flags() must be
> used vs. directly reading @console->flags.
> 
> Refactor and clarify that console_srcu_read_flags() is only
> needed if the console is registered or the caller is in a
> context where the registration status of the console may change
> (due to another context).
> 
> The function requires the caller holds @console_srcu, which will
> ensure that the caller sees an appropriate @flags value for the
> registered console and that exit/cleanup routines will not run
> if the console is in the process of unregistration.
> 
> Signed-off-by: John Ogness <john.ogness@...utronix.de>

Sounds good:

Reviewed-by: Petr Mladek <pmladek@...e.com>

Best Regards,
Petr