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Message-ID: <ZqpRO6YImKDRL8bS@pathway.suse.cz>
Date: Wed, 31 Jul 2024 16:59:07 +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 v3 13/19] printk: nbcon: Show replay message on
takeover
On Mon 2024-07-22 19:25:33, John Ogness wrote:
> An emergency or panic context can takeover console ownership
> while the current owner was printing a printk message. The
> atomic printer will re-print the message that the previous
> owner was printing. However, this can look confusing to the
> user and may even seem as though a message was lost.
>
> [3430014.1
> [3430014.181123] usb 1-2: Product: USB Audio
>
> Add a new field @nbcon_prev_seq to struct console to track
> the sequence number to print that was assigned to the previous
> console owner. If this matches the sequence number to print
> that the current owner is assigned, then a takeover must have
> occurred. In this case, print an additional message to inform
> the user that the previous message is being printed again.
>
> [3430014.1
> ** replaying previous printk message **
> [3430014.181123] usb 1-2: Product: USB Audio
>
> Signed-off-by: John Ogness <john.ogness@...utronix.de>
Reviewed-by: Petr Mladek <pmladek@...e.com>
Best Regards,
Petr
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