Messages in this thread | | | Date | Fri, 22 Nov 2013 16:39:08 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH v2 RFC 1/3] documentation: Add needed ACCESS_ONCE() calls to memory-barriers.txt |
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On Thu, Nov 21, 2013 at 01:31:27PM -0800, Paul E. McKenney wrote: > From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> > > The Documentation/memory-barriers.txt file was written before the need > for ACCESS_ONCE() was fully appreciated. It therefore contains no > ACCESS_ONCE() calls, which can be a problem when people lift examples > from it. This commit therefore adds ACCESS_ONCE() calls. >
Under the 'COMPILER BARRIER' section we state that:
"This is a general barrier - lesser varieties of compiler barrier do not exist."
One could argue ACCESS_ONCE() is such a lesser barrier.
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