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

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Date:	Tue, 10 Apr 2012 18:28:47 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Arvid Brodin <Arvid.Brodin@...n.com>
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"balferreira@...glemail.com" <balferreira@...glemail.com>
Subject: Re: [RFC] net/hsr: Add support for IEC 62439-3 High-availability
 Seamless Redundancy


> 3) My feeble suggestion to cast icmp_hdr() to (char *) is of course even worse (it doesn't
> even avoid the erroneous cast in the first place).
> 
> So what do we do?
> 

Reading Documentation/unalgined-memory-access.txt suggests that you
probably should copy the skb before passing up the stack (if necessary).
That is safe (but slightly slower).
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