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de in md_update_sb() which checks if it needs to repeat might test if an update is needed before step 1, then clear MD_CHANGE_PENDING after step 2, resulting in the wait returning early. So make sure all places that set MD_CHANGE_PENDING are atomicial, and bit_clear_unless (suggested by Neil) is introduced for the purpose. Cc: Martin Kepplinger <martink@posteo.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Sasha Levin <sasha.levin@oracle.com> Cc: <linux-kernel@vger.kernel.org> Reviewed-by: NeilBrown <neilb@suse.com> Signed-off-by: Guoqing Jiang <gqjiang@suse.com> Signed-off-by: Shaohua Li <shli@fb.com>
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