discard:
        kfree_skb(skb);
        /* Be careful here. If this function gets more complicated and
         * gcc suffers from register pressure on the x86, sk (in %ebx)
         * might be destroyed here. This current version compiles correctly,
         * but you have been warned.
         */
        return 0;
igaz, most a 2.6.26-os forrását nézem
debian gnu/linux @ linux-2.6.22.24-op1 | patchinfo