linux-kernel - Re: [PATCH] rtc: max77686: Remove some dead code

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Message-ID: <YJv+mMRcOuTJxLuk@piout.net>
Date:   Wed, 12 May 2021 18:13:12 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Edmundo Carmona Antoranz <eantoranz@...il.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        cw00.choi@...sung.com, b.zolnierkie@...sung.com,
        a.zummo@...ertech.it, linux-rtc@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] rtc: max77686: Remove some dead code

On 10/05/2021 08:20:52-0400, Krzysztof Kozlowski wrote:
> On 09/05/2021 17:06, Alexandre Belloni wrote:
> > On 08/05/2021 18:06:03-0600, Edmundo Carmona Antoranz wrote:
> >> On Sat, May 8, 2021 at 10:59 AM Christophe JAILLET
> >> <christophe.jaillet@...adoo.fr> wrote:
> >>>
> >>>>
> >>>> Following the recent conversations, I think it might make sense to do
> >>>> dev_err(&pdev->dev, "Failed to register RTC device: %pe\n", info->rtc_dev);
> >>>>
> >>>> Is that right?
> >>>>
> >>>
> >>> Yes, it is right, but it should be done in another patch.
> >>>
> >>> Would you like to give it a try?
> >>>
> >> Sure, I'll have the patch ready to send it when I see yours on next.
> > 
> > Does it make sense to print anything at all? Who would use the output?
> > Is anyone actually going to read it?
> 
> If the RTC core does not print the message, it should be
> dev_err_probe().  However the first is recently preferred - RTC core
> should do it for all drivers.  I find such error messages useful - helps
> easily spotting regressions via dmesg -l err.
> 

The only error path that will not print a message by default (it is
dev_dbg) is when rtc-ops is NULL which I don't expect would regress
anyway.

A better way to remove the dead code would be to switch to
devm_rtc_allocate_device/devm_rtc_register_device. And even better would
be to take that opportunity to set range_min and range_max ;)

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com