linux-kernel - Re: [PATCH 2/3] i2c: slave-mqueue: add a slave backend to receive and queue messages

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Date:   Wed, 5 Jun 2019 18:20:37 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Eduardo Valentin <eduval@...zon.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...el.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Haiyue Wang <haiyue.wang@...ux.intel.com>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] i2c: slave-mqueue: add a slave backend to receive and
 queue messages

On Wed, Jun 5, 2019 at 5:32 PM Eduardo Valentin <eduval@...zon.com> wrote:
> On Wed, Jun 05, 2019 at 11:25:39AM +0300, Andy Shevchenko wrote:
> > On Wed, Jun 5, 2019 at 6:30 AM Eduardo Valentin <eduval@...zon.com> wrote:

> Well, yes, but the point is you would be switching from a simple AND (&) operation
> to a division...
>
> I am keeping the power of 2 dep so that we can keep this with a simple &.

Works for me.

> > > > > +           .of_match_table = of_match_ptr(i2c_slave_mqueue_of_match),
> > > >
> > > > Wouldn't compiler warn you due to unused data?
> > > > Perhaps drop of_match_ptr() for good...
> > >
> > > Not sure what you meant here. I dont see any compiler warning.
> > > Also, of_match_ptr seams to be well spread in the kernel.
> >
> > If this will be compiled with CONFIG_OF=n...
>
> I see.. I obviously did not test with that config..
>
> > Though I didn't check all dependencies to see if it even possible. In
> > any case of_match_ptr() is redundant in both cases here.
> > Either you need to protect i2c_slave_mqueue_of_match with #ifdef
> > CONFIG_OF, or drop the macro use.
>
> I will wrap it into CONFIG_OF..

Would be this expected to work in the case of CONFIG_OF=n?
If no, why to introduce ugly #ifdef:s and additional macros?
Wouldn't be better to have
  depends on OF || COMPILE_TEST
?

-- 
With Best Regards,
Andy Shevchenko