netdev - Re: [PATCH net-next] neighbor: Add protocol attribute

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Message-ID: <ebf2bf81-64a0-6ce1-d693-e07da0f592a3@gmail.com>
Date:   Mon, 10 Dec 2018 19:47:33 -0700
From:   David Ahern <dsahern@...il.com>
To:     David Miller <davem@...emloft.net>, eric.dumazet@...il.com
Cc:     netdev@...r.kernel.org, roopa@...ulusnetworks.com
Subject: Re: [PATCH net-next] neighbor: Add protocol attribute

On 12/7/18 4:45 PM, David Miller wrote:
> 
> Right, neigh->ha[] should probably be kept 8-byte aligned.
> 

>From what I can see ha is only used with memcpy, and neighbour struct is
annotated with __randomize_layout. Are you saying that ha should be
marked with __aligned(8)?


@@ -150,7 +150,7 @@ struct neighbour {
        __u8                    type;
        __u8                    dead;
        seqlock_t               ha_lock;
-       unsigned char           ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned
long))];
+       unsigned char           ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned
long))] __aligned(8);
        struct hh_cache         hh;
        int                     (*output)(struct neighbour *, struct
sk_buff *);
        const struct neigh_ops  *ops;