linux-kernel - Re: [PATCH printk v2 1/5] kdb: do not assume write() callback available

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Message-ID: <20230711002536.GB12154@google.com>
Date:   Tue, 11 Jul 2023 09:25:36 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org,
        Jason Wessel <jason.wessel@...driver.com>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Douglas Anderson <dianders@...omium.org>,
        Aaron Tomlin <atomlin@...mlin.com>,
        kgdb-bugreport@...ts.sourceforge.net
Subject: Re: [PATCH printk v2 1/5] kdb: do not assume write() callback
 available

On (23/07/10 15:51), John Ogness wrote:
> It is allowed for consoles to provide no write() callback. For
> example ttynull does this.
> 
> Check if a write() callback is available before using it.
> 
> Signed-off-by: John Ogness <john.ogness@...utronix.de>
> Reviewed-by: Petr Mladek <pmladek@...e.com>
> Reviewed-by: Douglas Anderson <dianders@...omium.org>
> Reviewed-by: Daniel Thompson <daniel.thompson@...aro.org>

Reviewed-by: Sergey Senozhatsky <senozhatsky@...omium.org>