linux-kernel - Re: [PATCH tty-next v4 0/6] convert 8250 to nbcon

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Message-ID: <84y0zxp4ss.fsf@jogness.linutronix.de>
Date: Mon, 30 Dec 2024 16:35:55 +0106
From: John Ogness <john.ogness@...utronix.de>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jiri Slaby <jirislaby@...nel.org>, Petr Mladek <pmladek@...e.com>,
 Sergey Senozhatsky <senozhatsky@...omium.org>, Steven Rostedt
 <rostedt@...dmis.org>, Thomas Gleixner <tglx@...utronix.de>, Esben
 Haabendal <esben@...nix.com>, linux-serial@...r.kernel.org,
 linux-kernel@...r.kernel.org, Andy Shevchenko
 <andriy.shevchenko@...ux.intel.com>, Arnd Bergmann <arnd@...db.de>,
 Rengarajan S <rengarajan.s@...rochip.com>, Niklas Schnelle
 <schnelle@...ux.ibm.com>, Serge Semin <fancer.lancer@...il.com>, Wander
 Lairson Costa <wander@...hat.com>, Florian Fainelli
 <florian.fainelli@...adcom.com>, Ray Jui <rjui@...adcom.com>, Scott
 Branden <sbranden@...adcom.com>, Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>, Sunil V L
 <sunilvl@...tanamicro.com>, Matt Turner <mattst88@...il.com>, Stefan
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 <u.kleine-koenig@...libre.com>, Kevin Hilman <khilman@...libre.com>,
 Markus Schneider-Pargmann <msp@...libre.com>, Udit Kumar
 <u-kumar1@...com>, Griffin Kroah-Hartman <griffin@...ah.com>,
 linux-rpi-kernel@...ts.infradead.org,
 linux-arm-kernel@...ts.infradead.org, Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH tty-next v4 0/6] convert 8250 to nbcon

On 2024-12-27, John Ogness <john.ogness@...utronix.de> wrote:
> The changes since v3:
>
> - For serial8250_console_fifo_write() and
>   serial8250_console_byte_write(), use nbcon_can_proceed()
>   rather than repeatedly enter/exit unsafe regions.

I will revert this particular change for v5. It is necessary to
exit/enter unsafe regions per character so that handovers can occur
mid-line. Using nbcon_can_proceed() only allows the hostile takeover
case to perform mid-line interruptions.

John