powerpc: Remove comment about read_barrier_depends()

'read_barrier_depends()' doesn't exist anymore so stop talking about it.

Signed-off-by: Will Deacon <will@kernel.org>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Will Deacon 2019-11-08 17:01:18 +00:00 • committed by Paul E. McKenney
commit c7e9c01f92