net/socket: factor out helpers for memory and queue manipulation
Basic sock operations that udp code can use with its own memory accounting schema. No functional change is introduced in the existing APIs. v4 -> v5: - avoid whitespace changes v2 -> v4: - avoid exporting __sock_enqueue_skb v1 -> v2: - avoid export sock_rmem_free Acked-by: NHannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: NPaolo Abeni <pabeni@redhat.com> Acked-by: NEric Dumazet <edumazet@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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