netdev - use struct sock->sk_protinfo store private data?

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Date:	Mon, 13 Dec 2010 15:32:58 +0800
From:	Rui <wirelesser@...il.com>
To:	netdev@...r.kernel.org
Subject: use struct sock->sk_protinfo store private data?

hi

I saw one in-house kernel module use struct sock->sk_protinfo to store
a private data
is it safe? will other parts use it?

quoted from net/sock.h

  *	@sk_protinfo: private area, net family specific, when not using slab

thanks
rui
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