linux-kernel - Re: [PATCH v2 2/3] serial: core: Add support for DEVNAME:0.0 style naming for kernel console

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Date:   Wed, 13 Sep 2023 15:15:32 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Andy Shevchenko <andriy.shevchenko@...el.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, Dhruva Gole <d-gole@...com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        John Ogness <john.ogness@...utronix.de>,
        Johan Hovold <johan@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH v2 2/3] serial: core: Add support for DEVNAME:0.0 style
 naming for kernel console

* Andy Shevchenko <andriy.shevchenko@...el.com> [230912 15:07]:
> On Tue, Sep 12, 2023 at 02:03:44PM +0300, Tony Lindgren wrote:
> > +static LIST_HEAD(serial_base_consoles);
> 
> Don't you need a locking to access this list?
> If not, perhaps a comment why it's okay?

It's updated at arch_initcall() time only, I'll add a comment.

> > +	port_match = kasprintf(GFP_KERNEL, "%s:%i.%i", dev_name(port->dev),
> > +			       port->ctrl_id, port->port_id);
> 
> What about starting using cleanup.h?

OK seems to simplify things nicely :)

> > +EXPORT_SYMBOL_GPL(serial_base_add_preferred_console);
> 
> Can we use (start using) namespaced exports?

Sorry forgot about the namespace stuff already..

> ...
> 
> > +static int __init serial_base_add_con(char *name, char *opt)
> 
> const name
> const opt
> ?

For name yes, opt has issues as noted in the first patch in this
series.

> > +	opt = strchr(val, ',');
> > +	if (opt) {
> > +		opt[0] = '\0';
> > +		opt++;
> > +	}
> 
> strsep() ?
> 
> Actually param_array() uses strcspn() in similar situation.

OK I'll change to use strcspn().

> > +	if (!strlen(val))
> > +		return 0;
> 
> Btw, have you seen lib/cmdline.c? Can it be helpful here?

I don't think so as at this point we don't have param=value
pairs and param is the port name.

Will fix up the rest of the stuff you commented too thanks.

Regards,

Tony