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Message-ID: <20121207105809.GC2996@casper.infradead.org> Date: Fri, 7 Dec 2012 10:58:09 +0000 From: Thomas Graf <tgraf@...g.ch> To: David Laight <David.Laight@...LAB.COM> Cc: Nicolas Dichtel <nicolas.dichtel@...nd.com>, David Miller <davem@...emloft.net>, netdev@...r.kernel.org Subject: Re: [PATCH net-next 0/7] Allow to monitor multicast cache event via rtnetlink On 12/07/12 at 10:38am, David Laight wrote: > What are you going to align the data with respect to? > I doubt you can assume that the start of the netlink > message itself is 8 byte aligned - so any attempt > to 8 byte align an item is probably doomed to failure. Correct me if I'm wrong but skb->head will be aligned to SKB_DATA_ALIGN() which as I understand is guaranted to be 8 bytse aligned. So we can just add needed padding if skb->data would not be aligned correctly after the next netlink attribute header was added. All user space needs to do is use a receive buffer that is 8 byte aligned as well and we are good to go. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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