Re: [PATCH printk v3 13/19] printk: nbcon: Show replay message on takeover

[Petr Mladek]

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@xxxxxxxxxxxxx>

Reviewed-by: Petr Mladek <pmladek@xxxxxxxx>

Best Regards,
Petr