Re: [PATCH tip/core/rcu 16/21] drivers/infiniband: Remove now-redundant smp_read_barrier_depends()

[Jason Gunthorpe]

> commit c389c98ec5f4a7aa4c36853e89801eb5ea81870e
> Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
> Date:   Mon Nov 27 09:04:22 2017 -0800
> 
>     drivers/infiniband: Remove now-redundant smp_read_barrier_depends()
>     
>     The smp_read_barrier_depends() does nothing at all except on DEC Alpha,
>     and no current DEC Alpha systems use Infiniband:
>     
>     	lkml.kernel.org/r/20171023085921.jwbntptn6ictbnvj@tower
>     
>     This commit therefore makes Infiniband depend on !ALPHA and removes
>     the now-ineffective invocations of smp_read_barrier_depends() from
>     the InfiniBand driver.
>     
>     Please note that this patch should not be construed as my saying that
>     InfiniBand's memory ordering is correct, but rather that this patch does
>     not in any way affect InfiniBand's correctness.  In other words, the
>     result of applying this patch is bug-for-bug compatible with the original.
>     
>     Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
>     Cc: Doug Ledford <dledford@xxxxxxxxxx>
>     Cc: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
>     Cc: Richard Henderson <rth@xxxxxxxxxxx>
>     Cc: Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>
>     Cc: Matt Turner <mattst88@xxxxxxxxx>
>     Cc: Michael Cree <mcree@xxxxxxxxxxxx>
>     Cc: Andrea Parri <parri.andrea@xxxxxxxxx>
>     Cc: <linux-rdma@xxxxxxxxxxxxxxx>
>     Cc: <linux-alpha@xxxxxxxxxxxxxxx>
>     [ paulmck: Removed drivers/dma/ioat/dma.c per Jason Gunthorpe's feedback. ]

Let me know if you want this patch to flow through the rdma tree..

Acked-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>