linux-kernel - Re: [greybus-dev] [PATCH] Staging: greybus: usb: Fixed a coding style error

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Message-ID: <65efe8c2-3091-61d5-3eb6-fcc505727394@linaro.org>
Date:   Sun, 31 Mar 2019 01:43:19 -0500
From:   Alex Elder <elder@...aro.org>
To:     Joe Perches <joe@...ches.com>,
        Will Cunningham <wjcunningham7@...il.com>, johan@...nel.org
Cc:     devel@...verdev.osuosl.org, elder@...nel.org,
        linux-kernel@...r.kernel.org, greybus-dev@...ts.linaro.org
Subject: Re: [greybus-dev] [PATCH] Staging: greybus: usb: Fixed a coding style
 error

On 3/31/19 1:40 AM, Joe Perches wrote:
> On Sun, 2019-03-31 at 01:20 -0500, Alex Elder wrote:
>> On 3/31/19 1:04 AM, Joe Perches wrote:
>>> Blind adherence to 80 column limits leads to poor looking
>>> code.  Especially with longish identifier lengths.
>> I agree.  If it were me, I'd use a local variable.  For example:
>>
>> 	struct greybus_descriptor_cport *cport_desc = gbphy_dev->cport_desc;
>> 	...
>> 	connection = gb_connection_create(gbphy_dev->bundle,
>> 					  le16_to_cpu(cport_desc->id), NULL);
>>
>> Or maybe better:
>>
>> 	u16 cport_id = le16_to_cpu(gbphy_dev->cport_desc->id);
>> 	...
>> 	connection = gb_connection_create(gbphy_dev->bundle, cport_id, NULL);
> 
> True.
> 
> A possible negative though:
> 
> Temporaries that are only used once are sometimes
> less readable as the declaration is supposed to be
> done at an open brace and that could be relatively
> far away from the set and use.

Then assign it where it's used.  The point is we're talking about
a readability issue (long lines), and no matter how you try to fix
it there are tradeoffs, and it's subjective.  In any case, I prefer
the use of the local variable to solve this readability problem over
splitting the line.

					-Alex