netfilter: ip6_queue: rwlock to spinlock conversion
Converts queue_lock rwlock to a spinlock. (readlocked part can be changed by reads of integer values) One atomic operation instead of four per ipq_enqueue_packet() call. Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com> Signed-off-by: NPatrick McHardy <kaber@trash.net>
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