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SubjectRe: [PATCH tip/core/rcu 16/21] drivers/infiniband: Remove now-redundant smp_read_barrier_depends()
> commit c389c98ec5f4a7aa4c36853e89801eb5ea81870e
> Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
> 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@linux.vnet.ibm.com>
> Cc: Doug Ledford <dledford@redhat.com>
> Cc: Jason Gunthorpe <jgg@mellanox.com>
> Cc: Richard Henderson <rth@twiddle.net>
> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
> Cc: Matt Turner <mattst88@gmail.com>
> Cc: Michael Cree <mcree@orcon.net.nz>
> Cc: Andrea Parri <parri.andrea@gmail.com>
> Cc: <linux-rdma@vger.kernel.org>
> Cc: <linux-alpha@vger.kernel.org>
> [ 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@mellanox.com>

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