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Alexander Motin
5afc35b698
Use atomic_load_64() for zfs_refcount_count() to prevent torn reads on 32-bit platforms. On 64-bit ones it should not change anything. When built with ZFS_DEBUG but running without tracking enabled use atomics instead of mutexes same as for builds without ZFS_DEBUG. Since rc_tracked can't change live we can check it without lock. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Matthew Ahrens <mahrens@delphix.com> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Closes #12420