From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: c++std-parallel@accu.org
Cc: dhowells@redhat.com, Will Deacon <will.deacon@arm.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
"gcc@gcc.gnu.org" <gcc@gcc.gnu.org>,
p796231 <Peter.Sewell@cl.cam.ac.uk>,
"mark.batty@cl.cam.ac.uk" <Mark.Batty@cl.cam.ac.uk>,
Peter Zijlstra <peterz@infradead.org>,
Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>,
"michaelw@ca.ibm.com" <michaelw@ca.ibm.com>
Subject: Re: [c++std-parallel-1624] Re: Compilers and RCU readers: Once more unto the breach!
Date: Wed, 20 May 2015 07:02:16 -0700 [thread overview]
Message-ID: <20150520140216.GN6776@linux.vnet.ibm.com> (raw)
In-Reply-To: <31805.1432129025@warthog.procyon.org.uk>
On Wed, May 20, 2015 at 02:37:05PM +0100, David Howells wrote:
> Paul E. McKenney <paulmck@linux.vnet.ibm.com> wrote:
>
> > I was thinking of "y" as a simple variable, but if it is something more
> > complex, then the compiler could do this, right?
> >
> > char *x;
> >
> > y;
> > x = z;
>
> Yeah. I presume it has to maintain the ordering, though.
Agreed. Unless of course y writes to x or some such.
Given that there is already code in the Linux kernel relying on
dependencies being carried through stores to local variables,
this should not be a problem.
Or am I missing something?
Thanx, Paul
next prev parent reply other threads:[~2015-05-20 14:02 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-20 0:55 Compilers and RCU readers: Once more unto the breach! Paul E. McKenney
2015-05-20 1:57 ` Linus Torvalds
2015-05-20 1:57 ` Linus Torvalds
2015-05-20 1:57 ` Linus Torvalds
2015-05-20 2:10 ` Linus Torvalds
2015-05-20 2:41 ` Paul E. McKenney
2015-05-20 11:47 ` Will Deacon
2015-05-20 12:15 ` Paul E. McKenney
2015-05-20 13:18 ` David Howells
2015-05-20 13:30 ` Paul E. McKenney
2015-05-20 13:37 ` David Howells
2015-05-20 13:44 ` Ramana Radhakrishnan
2015-05-20 14:03 ` Paul E. McKenney
2015-05-20 14:15 ` Ramana Radhakrishnan
2015-05-20 15:12 ` Paul E. McKenney
2015-05-20 15:46 ` David Howells
2015-05-20 14:02 ` Paul E. McKenney [this message]
2015-05-20 15:46 ` Will Deacon
2015-05-20 15:54 ` Andrew Haley
2015-05-20 18:16 ` [c++std-parallel-1632] " Paul E. McKenney
2015-05-21 14:22 ` Michael Matz
2015-05-21 15:10 ` Paul E. McKenney
2015-05-21 16:17 ` Michael Matz
2015-05-21 18:37 ` Paul E. McKenney
2015-05-20 18:16 ` Paul E. McKenney
2015-05-21 19:24 ` Will Deacon
2015-05-21 20:02 ` Paul E. McKenney
2015-05-21 20:42 ` Linus Torvalds
2015-05-21 22:02 ` Paul E. McKenney
2015-05-22 6:43 ` Ingo Molnar
2015-05-22 10:43 ` Richard Kenner
2015-05-22 13:11 ` Paul E. McKenney
2015-05-22 13:12 ` Paul E. McKenney
2015-05-26 17:37 ` [c++std-parallel-1641] " Torvald Riegel
2015-05-22 17:30 ` Will Deacon
2015-05-22 18:55 ` Paul E. McKenney
2015-05-20 2:34 ` Paul E. McKenney
2015-05-20 7:34 ` [c++std-parallel-1614] " Jens Maurer
2015-05-20 7:34 ` Jens Maurer
2015-05-20 7:34 ` Jens Maurer
2015-05-20 9:03 ` Richard Biener
2015-05-20 12:02 ` Paul E. McKenney
2015-05-20 12:01 ` [c++std-parallel-1616] " Paul E. McKenney
2015-05-26 17:08 ` [c++std-parallel-1611] " Torvald Riegel
2015-05-27 1:41 ` [c++std-parallel-1651] " Paul E. McKenney
2015-07-14 0:44 ` Paul E. McKenney
2015-09-22 17:00 ` Paul E. McKenney
[not found] ` <CAPUmR1aqV_cQWjE8qC9x2sfmW-1ocKKMtCgNbjZH0cJ-AO2WTg@mail.gmail.com>
2015-09-23 23:26 ` [c++std-parallel-2008] " Paul E. McKenney
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