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From: Peter Zijlstra <peterz@infradead.org>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Daniel Jordan <daniel.m.jordan@oracle.com>,
	parri.andrea@gmail.com, will.deacon@arm.com,
	boqun.feng@gmail.com, npiggin@gmail.com, dhowells@redhat.com,
	j.alglave@ucl.ac.uk, luc.maranget@inria.fr,
	paulmck@linux.vnet.ibm.com, akiyks@gmail.com,
	linux-kernel@vger.kernel.org,
	Steven Sistare <steven.sistare@oracle.com>,
	Pasha Tatashin <pasha.tatashin@oracle.com>
Subject: Re: Control dependency between prior load in while condition and later store?
Date: Thu, 5 Apr 2018 16:56:50 +0200	[thread overview]
Message-ID: <20180405145650.GT4043@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1804051022170.1384-100000@iolanthe.rowland.org>

On Thu, Apr 05, 2018 at 10:35:22AM -0400, Alan Stern wrote:
> In this example, READ_ONCE() is in fact a volatile access, so we're 
> okay.

But our documentation clearly states a control-dep can only be from a
READ_ONCE() (or something stronger), right? So we should be good
irrespectively.

  reply	other threads:[~2018-04-05 14:57 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-04 19:29 Control dependency between prior load in while condition and later store? Daniel Jordan
2018-04-04 20:35 ` Alan Stern
2018-04-04 21:10   ` Daniel Jordan
2018-04-05  7:32   ` Peter Zijlstra
2018-04-05 14:35     ` Alan Stern
2018-04-05 14:56       ` Peter Zijlstra [this message]
2018-04-05 15:16         ` Alan Stern

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