Atomically check and set dropped zevent count
ratelimit_dropped isn't protected by a lock and is expected to be updated atomically. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ryan Moeller <ryan@iXsystems.com> Closes #11822
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module/zfs
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@ -657,8 +657,7 @@ zfs_zevent_next(zfs_zevent_t *ze, nvlist_t **event, uint64_t *event_size,
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#ifdef _KERNEL
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/* Include events dropped due to rate limiting */
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*dropped += ratelimit_dropped;
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ratelimit_dropped = 0;
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*dropped += atomic_swap_64(&ratelimit_dropped, 0);
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#endif
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ze->ze_dropped = 0;
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out:
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