linux-kernel - Re: [PATCH v3.5 10/19] mac8011: slight optimization of addr compare

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Message-ID: <52CB7736.701@huawei.com>
Date:	Tue, 7 Jan 2014 11:40:38 +0800
From:	Ding Tianhong <dingtianhong@...wei.com>
To:	Johannes Berg <johannes@...solutions.net>
CC:	"John W. Linville" <linville@...driver.com>,
	"David S. Miller" <davem@...emloft.net>,
	<linux-wireless@...r.kernel.org>, Netdev <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3.5 10/19] mac8011: slight optimization of addr compare

On 2014/1/6 23:11, Johannes Berg wrote:
> On Thu, 2013-12-26 at 19:40 +0800, Ding Tianhong wrote:
>> Use the possibly more efficient ether_addr_equal
>> to instead of memcmp.
> 
> This is a slow-path, I don't think that's really worth it. It kinda
> makes sense, but relies on the struct mac_address allocation for
> alignment and the fact that there are no other members in that struct,
> so it seems to me that this ought to also add some alignment attributes?
> 
> johannes
> 
> 

Yes, I had to say that it is really a slight optimization.And I am sure the address in the struct
is alignment, otherwise I have to use the ether_addr_equal_unaligned().

Regards
Ding 

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