Hi :)
On Thu, Oct 11, 2012 at 7:20 PM, Kshemendra KP <kshemendra@xxxxxxxxxxxxx> wrote:
> 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();
> }
In most cases, read barrier is needed to make sure all
cores/processors see the latest data updates
Specificly, in this case, i think it is done to prevent memory free
race. Which..if not well prevented, could lead to double free. And
that's bad.
--
regards,
Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
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