net: implement lockless SO_PRIORITY
This is a followup of 8bf43be7 ("net: annotate data-races around sk->sk_priority"). sk->sk_priority can be read and written without holding the socket lock. Signed-off-by:Eric Dumazet <edumazet@google.com> Reviewed-by:
Wenjia Zhang <wenjia@linux.ibm.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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