From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net-next] etherdevice: Optimize
 compare_ether_addr/ether_addr_equal
Date: Sat, 31 Aug 2013 18:27:50 -0400 (EDT)
Message-ID: <20130831.182750.678717944135962097.davem@davemloft.net>
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From: Joe Perches <joe@perches.com>
Date: Sat, 31 Aug 2013 01:54:16 -0700

> When CONFIG_HAS_EFFICIENT_UNALIGNED_ACCESS is set,
> optimize compare_ether_addr a little by removing an
> xor and or by using a u32 and u16 comparison
> instead of 3 separate u16 comparisons.
> 
> Make the ether_addr_equal_64bits code a bit simpler
> by adding a test for CONFIG_64BIT and calling
> ether_addr_equal otherwise.
> 
> This also slightly improves ether_addr_equal_64bits
> by removing the zap_last_2bytes shifts in the !64bit
> case.
> 
> Signed-off-by: Joe Perches <joe@perches.com>

You'll need to update Documantion/unaligned-memory-access.txt as well
because it uses this funcation as a "real life" example.