tcp: fix lockdep splat in tcp_snd_una_update()
tcp_snd_una_update() and tcp_rcv_nxt_update() call u64_stats_update_begin() either from process context or BH handler. This triggers a lockdep splat on 32bit & SMP builds. We could add u64_stats_update_begin_bh() variant but this would slow down 32bit builds with useless local_disable_bh() and local_enable_bh() pairs, since we own the socket lock at this point. I add sock_owned_by_me() helper to have proper lockdep support even on 64bit builds, and new u64_stats_update_begin_raw() and u64_stats_update_end_raw methods. Fixes: c10d9310 ("tcp: do not assume TCP code is non preemptible") Reported-by: NFabio Estevam <festevam@gmail.com> Diagnosed-by: NFrancois Romieu <romieu@fr.zoreil.com> Signed-off-by: NEric Dumazet <edumazet@google.com> Tested-by: NFabio Estevam <fabio.estevam@nxp.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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