linux-kernel - Re: [PATCH tip/core/rcu 16/21] drivers/infiniband: Remove now-redundant smp_read_barrier

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Date:   Tue, 5 Dec 2017 08:08:32 -0700
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com,
        Doug Ledford <dledford@...hat.com>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Michael Cree <mcree@...on.net.nz>,
        Andrea Parri <parri.andrea@...il.com>,
        linux-rdma@...r.kernel.org, linux-alpha@...r.kernel.org
Subject: Re: [PATCH tip/core/rcu 16/21] drivers/infiniband: Remove
 now-redundant smp_read_barrier_depends()

> commit c389c98ec5f4a7aa4c36853e89801eb5ea81870e
> Author: Paul E. McKenney <paulmck@...ux.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@...er
>     
>     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@...ux.vnet.ibm.com>
>     Cc: Doug Ledford <dledford@...hat.com>
>     Cc: Jason Gunthorpe <jgg@...lanox.com>
>     Cc: Richard Henderson <rth@...ddle.net>
>     Cc: Ivan Kokshaysky <ink@...assic.park.msu.ru>
>     Cc: Matt Turner <mattst88@...il.com>
>     Cc: Michael Cree <mcree@...on.net.nz>
>     Cc: Andrea Parri <parri.andrea@...il.com>
>     Cc: <linux-rdma@...r.kernel.org>
>     Cc: <linux-alpha@...r.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@...lanox.com>