ceph: fix improper use of smp_mb__before_atomic()
[ Upstream commit 749607731e26dfb2558118038c40e9c0c80d23b5 ] This barrier only applies to the read-modify-write operations; in particular, it does not apply to the atomic64_set() primitive. Replace the barrier with an smp_mb(). Fixes: fdd4e158 ("ceph: rework dcache readdir") Reported-by: N"Paul E. McKenney" <paulmck@linux.ibm.com> Reported-by: NPeter Zijlstra <peterz@infradead.org> Signed-off-by: NAndrea Parri <andrea.parri@amarulasolutions.com> Reviewed-by: N"Yan, Zheng" <zyan@redhat.com> Signed-off-by: NIlya Dryomov <idryomov@gmail.com> Signed-off-by: NSasha Levin <sashal@kernel.org>
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