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5047 don't use atomic_*_nv if you discard the return value Author: Josef 'Jeff' Sipek <josef.sipek@nexenta.com> Reviewed by: Garrett D'Amore <garrett@damore.org> Reviewed by: Jason King <jason.brian.king@gmail.com> Reviewed by: Matthew Ahrens <mahrens@delphix.com> Approved by: Robert Mustacchi <rm@joyent.com> References: https://www.illumos.org/issues/5047 https://github.com/illumos/illumos-gate/commit/640c167 Porting Notes: Several hunks from the original patch where not specific to ZFS and thus were dropped. Ported-by: Chris Dunlop <chris@onthe.net.au> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Richard Yao <ryao@gentoo.org> Issue #3172