linux-kernel - Re: [PATCH printk v2 4/8] printk: nbcon: Add buffer management

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Message-ID: <ZNOdYoCyFmf8UEL0@alley>
Date:   Wed, 9 Aug 2023 16:06:26 +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 v2 4/8] printk: nbcon: Add buffer management

On Fri 2023-07-28 02:08:29, John Ogness wrote:
> From: Thomas Gleixner <tglx@...utronix.de>
> 
> In case of hostile takeovers it must be ensured that the previous
> owner cannot scribble over the output buffer of the emergency/panic
> context. This is achieved by:
> 
>  - Adding a global output buffer instance for the panic context.
>    This is the only situation where hostile takeovers can occur and
>    there is always at most 1 panic context.
> 
>  - Allocating an output buffer per console upon console
>    registration. This buffer is used by the console owner when not
>    in panic context.
> 
>  - Choosing the appropriate buffer is handled in the acquire/release
>    functions.
> 
> Co-developed-by: John Ogness <john.ogness@...utronix.de>
> Signed-off-by: John Ogness <john.ogness@...utronix.de>
> Signed-off-by: Thomas Gleixner (Intel) <tglx@...utronix.de>

Looks good to me:

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

Best Regards,
Petr