Hi,
When I was looking into consume_skb() routine (net/core/skbuff.c),
there is smp_rmb() read barrier is present.
It is not clear why this is needed here. Basically this routine frees
sk_buff if only one user reference is theere
void consume_skb(struct sk_buff * skb)
{
if (unlikely(!skb))
return;
if (likley (atomic_read (&skb->users) == 1))
smp_rmb()
--------------------------------------------------------> need for this
barrier
......
__kfree_skb();
}
Regards
Kshemendra
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