linux-kernel - Re: ASoC: da7218: Use common error handling code in da7218_of_to

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Message-ID: <2a38fc07-ebf1-3e61-d809-ba6ed6dbe45a@users.sourceforge.net>
Date:   Fri, 24 Nov 2017 14:50:59 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     Mark Brown <broonie@...nel.org>,
        Adam Thomson <Adam.Thomson.Opensource@...semi.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        support.opensource@...semi.com
Cc:     Jaroslav Kysela <perex@...ex.cz>,
        Liam Girdwood <lgirdwood@...il.com>,
        Takashi Iwai <tiwai@...e.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: ASoC: da7218: Use common error handling code in
 da7218_of_to_pdata()

>>> Add a jump target so that a bit of exception handling can be better reused
>>> in an if branch of this function.
> 
>> Hmm. Doesn't really gain an awful lot this. Would understand if there were
>> multiple return paths, but in that case I'd have implemented something like
>> this anyway. Also your patch description isn't really correct. You're re-using
>> code from the sunny day scenario to handle an exception.
> 
> Other people have given him similar feedback on his other patches with
> this pattern.  I'm not intending to apply any of them.

I can offer another bit of information for a software development discussion. 💭

The affected source file can be compiled for the processor architecture “x86_64”
by a tool like “GCC 6.4.1+r251631-1.3” from the software distribution
“openSUSE Tumbleweed” with the following command example.

my_cc=/usr/bin/gcc-6 \
&& my_module=sound/soc/codecs/da7218.o \
&& for XYZ in 0 s 3; do echo "   _____ $XYZ _____" \
&& my_extra="-O$XYZ" \
&& git checkout ':/^ASoC: da7218: Delete two error messages for a failed memory allocation in da7218_of_to_pdata' \
&& make -j4 CC="${my_cc}" HOSTCC="${my_cc}" EXTRA_CFLAGS="${my_extra}" allmodconfig "${my_module}" \
&& size "${my_module}" \
&& git checkout ':/^ASoC: da7218: Use common error handling code in da7218_of_to_pdata' \
&& make -j4 CC="${my_cc}" HOSTCC="${my_cc}" EXTRA_CFLAGS="${my_extra}" allmodconfig "${my_module}" \
&& size "${my_module}"; done


🔮 Do you find the following differences worth for further clarification?

╔═════════╤══════╗
║ setting │ text ║
╠═════════╪══════╣
║   O0    │ -25  ║
║   Os    │ -14  ║
║   O3    │ +11  ║
╚═════════╧══════╝


Regards,
Markus