linux-kernel - Re: [PATCH v3 07/14] software_node: Add support for fwnode

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Date:   Thu, 24 Dec 2020 15:03:18 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Daniel Scally <djrscally@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        devel@...ica.org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Yong Zhi <yong.zhi@...el.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Bingbu Cao <bingbu.cao@...el.com>,
        Tian Shu Qiu <tian.shu.qiu@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Robert Moore <robert.moore@...el.com>,
        Erik Kaneda <erik.kaneda@...el.com>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        kieran.bingham+renesas@...asonboard.com,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Marco Felsch <m.felsch@...gutronix.de>,
        niklas.soderlund+renesas@...natech.se,
        Steve Longerbeam <slongerbeam@...il.com>,
        "Krogerus, Heikki" <heikki.krogerus@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v3 07/14] software_node: Add support for fwnode_graph*()
 family of functions

On Thu, Dec 24, 2020 at 2:55 PM Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
> On Thu, Dec 24, 2020 at 02:24:12PM +0200, Andy Shevchenko wrote:
> > On Thu, Dec 24, 2020 at 3:14 AM Daniel Scally wrote:

...

> > > +               if (!strncmp(to_swnode(port)->node->name, "port@",
> >
> > You may use here corresponding _FMT macro.
> >
> > > +                            FWNODE_GRAPH_PORT_NAME_PREFIX_LEN))
> > > +                       return port;

...

> > > +       /* Ports have naming style "port@n", we need to select the n */
> >
> > > +       ret = kstrtou32(swnode->parent->node->name + FWNODE_GRAPH_PORT_NAME_PREFIX_LEN,
> >
> > Maybe a temporary variable?
> >
> >   unsigned int prefix_len = FWNODE_GRAPH_PORT_NAME_PREFIX_LEN;
> >   ...
> >   ret = kstrtou32(swnode->parent->node->name + prefix_len,
>
> Honestly I'm wondering if those macros don't hinder readability. I'd
> rather write
>
>         + strlen("port@")

Works for me, since the compiler optimizes this away to be a plain constant.

> and let the compiler optimize this to a compile-time constant.
>
> > > +                       10, &endpoint->port);
> > > +       if (ret)
> > > +               return ret;


-- 
With Best Regards,
Andy Shevchenko