linux-kernel - Re: [PATCH printk v1 01/18] kdb: do not assume write() callback available

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Date:   Thu, 9 Mar 2023 12:26:23 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Daniel Thompson <daniel.thompson@...aro.org>
Cc:     John Ogness <john.ogness@...utronix.de>,
        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>,
        Douglas Anderson <dianders@...omium.org>,
        Aaron Tomlin <atomlin@...hat.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        kgdb-bugreport@...ts.sourceforge.net
Subject: Re: [PATCH printk v1 01/18] kdb: do not assume write() callback
 available

On Thu 2023-03-09 10:52:40, Daniel Thompson wrote:
> On Thu, Mar 02, 2023 at 09:02:01PM +0106, 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: Daniel Thompson <daniel.thompson@...aro.org>
> 
> Any thoughts on best way to land the series. All via one tree or can
> we pick and mix?

I would prefer to take everything via the printk tree because
most changes are there. Otherwise, we might end up with non-necessary
cross-tree merge conflicts. Also I would know when all pieces are
there.

That said, this seems to be the only change in
kernel/debug/kdb/kdb_io.c and it is relatively independent.
So, it should not be a big problem to take it separately.

Best Regards,
Petr