netdev - Re: [RFC] net/hsr: Add support for IEC 62439-3 High-availability Seamless Redundancy

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Message-Id: <20120404.201739.672373176675875061.davem@davemloft.net>
Date:	Wed, 04 Apr 2012 20:17:39 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	arvid.brodin@...a.com
Cc:	shemminger@...tta.com, netdev@...r.kernel.org,
	balferreira@...glemail.com, arvid.brodin@...n.com
Subject: Re: [RFC] net/hsr: Add support for IEC 62439-3 High-availability
 Seamless Redundancy

From: Arvid Brodin <arvid.brodin@...a.com>
Date: Thu, 5 Apr 2012 01:09:48 +0200

> -		icmp_param.data.icmph	   = *icmp_hdr(skb);
> +		memcpy(&icmp_param.data.icmph, icmp_hdr(skb),
> +						sizeof(icmp_param.data.icmph));

GCC can and will optimize this into an inline assignment, and thus
have the same unaligned access problems, because it determines
alignment based upon the types involved.
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