Documentation: Kill all references to mmiowb()
The guarantees provided by mmiowb() are now provided implicitly by spin_unlock(), so remove all references to this most confusing of barriers from our Documentation. Good riddance. Acked-by: NLinus Torvalds <torvalds@linux-foundation.org> Signed-off-by: NWill Deacon <will.deacon@arm.com>
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