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Re: [PATCH locking/Documentation 1/2] Add note of release-acquire store vulnerability

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH locking/Documentation 1/2] Add note of release-acquire store vulnerability
Date 2016-09-30 11:00 +0200
Message-ID <sn1PM-7WT-5@gated-at.bofh.it> (permalink)
References <smP2a-8bU-15@gated-at.bofh.it> <smPlv-8iw-15@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Thu, Sep 29, 2016 at 03:36:38PM -0400, Alan Stern wrote:
> > > If you execute P0 and P1 concurrently and one store of each 'wins' the
> > > LWSYNC of either is null and void, and therefore P2 is unordered and can
> > > observe r2==0.
> 
> Not so.  lwsync instructions cannot be "voided".

I distinctly remember there being a case (smp_wmb()) where the lwsync
would disappear if the store was lost.

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Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability Peter Zijlstra <peterz@infradead.org> - 2016-09-29 18:00 +0200
  Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability Will Deacon <will.deacon@arm.com> - 2016-09-29 18:10 +0200
    Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability Peter Zijlstra <peterz@infradead.org> - 2016-09-29 18:20 +0200
      Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-09-29 18:50 +0200
    Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-09-29 18:50 +0200
      Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability Will Deacon <will.deacon@arm.com> - 2016-09-29 19:20 +0200
        Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-09-29 19:30 +0200
          Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-09-29 20:10 +0200
            Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-09-29 20:20 +0200
              Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability Peter Zijlstra <peterz@infradead.org> - 2016-09-29 20:50 +0200
                Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-09-29 21:20 +0200
                Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability Alan Stern <stern@rowland.harvard.edu> - 2016-09-29 21:40 +0200
                Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-09-29 22:30 +0200
                Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability Peter Zijlstra <peterz@infradead.org> - 2016-09-30 11:00 +0200
                Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability Peter Zijlstra <peterz@infradead.org> - 2016-09-30 11:10 +0200
                Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability Peter Zijlstra <peterz@infradead.org> - 2016-09-30 12:00 +0200
                Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-09-30 14:20 +0200
                Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability Peter Zijlstra <peterz@infradead.org> - 2016-09-30 15:00 +0200
                Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-09-30 15:40 +0200
          Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability Boqun Feng <boqun.feng@gmail.com> - 2016-09-30 08:00 +0200
            Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability Will Deacon <will.deacon@arm.com> - 2016-09-30 11:30 +0200
              Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-09-30 13:40 +0200
      Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability Peter Zijlstra <peterz@infradead.org> - 2016-09-30 12:30 +0200
        Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-09-30 14:20 +0200
          Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability Peter Zijlstra <peterz@infradead.org> - 2016-09-30 14:50 +0200
            Re: [PATCH locking/Documentation 1/2] Add note of release-acquire  store vulnerability "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-09-30 15:20 +0200

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