linux-kernel - Re: [PATCH printk v5 11/30] nbcon: Provide functions for drivers to acquire console for non-printing

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Date: Mon, 06 May 2024 12:35:21 +0206
From: John Ogness <john.ogness@...utronix.de>
To: Petr Mladek <pmladek@...e.com>
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 11/30] nbcon: Provide functions for drivers to
 acquire console for non-printing

On 2024-05-02, John Ogness <john.ogness@...utronix.de> wrote:
> diff --git a/kernel/printk/nbcon.c b/kernel/printk/nbcon.c
> index dd7c3180b335..b8a7e3e136d3 100644
> --- a/kernel/printk/nbcon.c
> +++ b/kernel/printk/nbcon.c
> @@ -989,3 +991,54 @@ void nbcon_free(struct console *con)
>  
>  	con->pbufs = NULL;
>  }
> +
> +/**
> + * nbcon_driver_try_acquire - Try to acquire nbcon console and enter unsafe
> + *				section
> + * @con:	The nbcon console to acquire
> + *
> + * Context:	Under the locking mechanism implemented in
> + *		@con->device_lock() including disabling migration.

 * Return:	True if the console was acquired. False otherwise.

John