From: Peter Zijlstra <peterz@infradead.org>
To: Bernard Metzler <BMT@zurich.ibm.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>, Arnd Bergmann <arnd@arndb.de>,
Doug Ledford <dledford@redhat.com>,
linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: Re: [PATCH] rdma/siw: avoid smp_store_mb() on a u64
Date: Fri, 12 Jul 2019 15:19:30 +0200 [thread overview]
Message-ID: <20190712131930.GT3419@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <OF36428621.B839DE8B-ON00258435.00461748-00258435.0047E413@notes.na.collabserv.com>
On Fri, Jul 12, 2019 at 01:05:14PM +0000, Bernard Metzler wrote:
> @@ -1131,6 +1131,10 @@ int siw_poll_cq(struct ib_cq *base_cq, int num_cqe, struct ib_wc *wc)
> * number of not reaped CQE's regardless of its notification
> * type and current or new CQ notification settings.
> *
> + * This function gets called only by kernel consumers.
> + * Notification state must immediately become visible to all
> + * associated kernel producers (QP's).
No amount of memory barriers can achieve that goal.
next prev parent reply other threads:[~2019-07-12 13:19 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-12 8:51 [PATCH] rdma/siw: avoid smp_store_mb() on a u64 Arnd Bergmann
2019-07-12 11:33 ` Bernard Metzler
2019-07-12 11:47 ` Peter Zijlstra
2019-07-12 12:03 ` Jason Gunthorpe
2019-07-12 12:27 ` Bernard Metzler
2019-07-12 13:05 ` Bernard Metzler
2019-07-12 13:19 ` Peter Zijlstra [this message]
2019-07-12 13:35 ` Bernard Metzler
2019-07-12 13:22 ` Arnd Bergmann
2019-07-12 15:14 ` Jason Gunthorpe
2019-07-12 20:24 ` Arnd Bergmann
2019-07-12 13:53 ` Jason Gunthorpe
2019-07-12 14:35 ` Bernard Metzler
2019-07-12 14:42 ` Jason Gunthorpe
2019-07-12 15:24 ` Bernard Metzler
2019-07-12 15:32 ` Jason Gunthorpe
2019-07-12 17:40 ` Bernard Metzler
2019-07-12 17:45 ` Jason Gunthorpe
2019-07-12 18:06 ` Bernard Metzler
2019-07-12 16:12 ` Peter Zijlstra
2019-07-25 17:23 ` Jason Gunthorpe
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