linux-kernel - Re: [v2 PATCH 2/2] netprio_cgroup: Use memcpy instead of the for-loop to copy priomap

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Message-ID: <505046A5.1050009@linux.vnet.ibm.com>
Date:	Wed, 12 Sep 2012 13:54:05 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	David Miller <davem@...emloft.net>
CC:	nhorman@...driver.com, David.Laight@...lab.com,
	john.r.fastabend@...el.com, gaofeng@...fujitsu.com,
	eric.dumazet@...il.com, mark.d.rustad@...el.com,
	lizefan@...wei.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [v2 PATCH 2/2] netprio_cgroup: Use memcpy instead of the for-loop
 to copy priomap

On 09/12/2012 01:19 PM, David Miller wrote:
> From: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
> Date: Wed, 12 Sep 2012 11:37:47 +0530
> 
>> +		memcpy(new_priomap->priomap, old_priomap->priomap,
>> +			old_priomap->priomap_len *
>> +					sizeof(old_priomap->priomap[0]));
> 
> This argument indentation is ridiculous.  Try:
> 
> 		memcpy(new_priomap->priomap, old_priomap->priomap,
> 		       old_priomap->priomap_len *
> 		       sizeof(old_priomap->priomap[0]));
> 
> Using TABs exclusively for argumentat indentation is not the goal.
> 
> Rather, lining the arguments up properly so that they sit at the first
> column after the first line's openning parenthesis is what you should
> be trying to achieve.

OK, will fix it, thanks!

> 
> And ignoring whatever stylistic convention we may or may not have, I
> find it impossibly hard to believe that the code quoted above looks
> good even to you.
>

On second thoughts, I think the memcpy in this case will actually be worse
since it will copy the contents in chunks of smaller size than the for-loop.

Or, did you mean to say that this code is plain wrong for some reason?

Regards,
Srivatsa S. Bhat

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