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| author | Eric Dumazet <edumazet@google.com> | 2016-11-16 14:54:50 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-11-16 18:32:02 -0500 |
| commit | 89c4b442b78bdba388337cc746fe63caba85f46c (patch) | |
| tree | 825a8d6e04cdc937950e9d8a79b52eeb249236c3 /net/sctp/associola.c | |
| parent | 1629dd4f763cc15ac3b2711ac65dab153b738c6d (diff) | |
| download | linux-89c4b442b78bdba388337cc746fe63caba85f46c.tar.bz2 | |
netpoll: more efficient locking
Callers of netpoll_poll_lock() own NAPI_STATE_SCHED
Callers of netpoll_poll_unlock() have BH blocked between
the NAPI_STATE_SCHED being cleared and poll_lock is released.
We can avoid the spinlock which has no contention, and use cmpxchg()
on poll_owner which we need to set anyway.
This removes a possible lockdep violation after the cited commit,
since sk_busy_loop() re-enables BH before calling busy_poll_stop()
Fixes: 217f69743681 ("net: busy-poll: allow preemption in sk_busy_loop()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/associola.c')
0 files changed, 0 insertions, 0 deletions