From: Peter Zijlstra <peterz@infradead.org>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Will Deacon <will.deacon@arm.com>,
linux-kernel@vger.kernel.org, mingo@kernel.org,
dhowells@redhat.com, stern@rowland.harvard.edu
Subject: Re: [PATCH locking/Documentation 1/2] Add note of release-acquire store vulnerability
Date: Fri, 30 Sep 2016 14:51:13 +0200 [thread overview]
Message-ID: <20160930125113.GY5012@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20160930121403.GO14933@linux.vnet.ibm.com>
On Fri, Sep 30, 2016 at 05:14:03AM -0700, Paul E. McKenney wrote:
> PowerPC does not "obscure" stores, so both stores really are there and
> the lwsync really has effect on all CPUs. From what I understand, even
> CPUs that do obscure stores only do so in the case of repeated stores
> by the same CPU to the same variable, and the above litmus test doesn't
> have this.
>
> So all the stores happen, and each CPU's stores are at least locally
> ordered.
OK, when I'm not sure I ever understood the case where smp_wmb() went
wonky on PPC, sadly I cannot now find the email where you mentioned
that :/
next prev parent reply other threads:[~2016-09-30 12:51 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-29 15:54 [PATCH locking/Documentation 1/2] Add note of release-acquire store vulnerability Paul E. McKenney
2016-09-29 15:58 ` Peter Zijlstra
2016-09-29 16:03 ` Will Deacon
2016-09-29 16:17 ` Peter Zijlstra
2016-09-29 16:44 ` Paul E. McKenney
2016-09-29 16:43 ` Paul E. McKenney
2016-09-29 17:10 ` Will Deacon
2016-09-29 17:23 ` Paul E. McKenney
2016-09-29 18:04 ` Paul E. McKenney
2016-09-29 18:10 ` Paul E. McKenney
2016-09-29 18:44 ` Peter Zijlstra
2016-09-29 19:18 ` Paul E. McKenney
2016-09-29 19:36 ` Alan Stern
2016-09-29 20:26 ` Paul E. McKenney
2016-09-30 8:53 ` Peter Zijlstra
2016-09-30 9:00 ` Peter Zijlstra
2016-09-30 9:57 ` Peter Zijlstra
2016-09-30 12:14 ` Paul E. McKenney
2016-09-30 12:51 ` Peter Zijlstra [this message]
2016-09-30 13:35 ` Paul E. McKenney
2016-09-30 5:53 ` Boqun Feng
2016-09-30 9:20 ` Will Deacon
2016-09-30 11:35 ` Paul E. McKenney
2016-09-30 10:25 ` Peter Zijlstra
2016-09-30 12:17 ` Paul E. McKenney
2016-09-30 12:45 ` Peter Zijlstra
2016-09-30 13:10 ` Paul E. McKenney
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