linux-kernel - Re: [PATCH -next] batadv: Slight optimization of batadv_compare

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Message-Id: <20131206.153944.1382127535160341376.davem@davemloft.net>
Date:	Fri, 06 Dec 2013 15:39:44 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	joe@...ches.com
Cc:	mareklindner@...mailbox.ch, sw@...onwunderlich.de,
	antonio@...hcoding.com, b.a.t.m.a.n@...ts.open-mesh.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] batadv: Slight optimization of batadv_compare_eth

From: Joe Perches <joe@...ches.com>
Date: Fri, 06 Dec 2013 00:18:10 -0800

> @@ -266,7 +266,11 @@ static inline void batadv_dbg(int type __always_unused,
>   */
>  static inline int batadv_compare_eth(const void *data1, const void *data2)
>  {
> -	return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
> +#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
> +	return ether_addr_equal(data1, data2);
> +#else
> +	return memcmp(data1, data2, ETH_ALEN) == 0;
> +#endif
>  }

Let's not crap up implementations with these ifdefs.

What's the specific situation here?  Is it that 'data1' and/or
'data2' my not be u16 aligned?

If so, make a function for that in linux/etherdevice.h and invoke it
in such places.  You can name it something like
"ether_addr_equal_unaligned()" or similar.

Thanks.
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