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Re: linux-next: manual merge of the rcu tree with the tip tree

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: linux-next: manual merge of the rcu tree with the tip tree
Date 2017-08-01 16:20 +0200
Message-ID <u9GbD-52o-7@gated-at.bofh.it> (permalink)
References (1 earlier) <u9lAe-8rv-21@gated-at.bofh.it> <u9sV4-4wv-7@gated-at.bofh.it> <u9wFj-6QY-1@gated-at.bofh.it> <u9FIC-4Dg-11@gated-at.bofh.it> <u9FSj-4Gv-13@gated-at.bofh.it>
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On Tue, Aug 01, 2017 at 03:58:49PM +0200, Peter Zijlstra wrote:
> On Tue, Aug 01, 2017 at 06:43:14AM -0700, Andy Lutomirski wrote:
> > Anyway, can you document whatever property you require with a comment
> > in switch_mm() or wherever you're finding that property so that future
> > arch changes don't break it?
> 
> We need _a_ smp_mb after rq->curr store. x86 has plenty.

That is, we need it when we change to a different !0 mm. And we have the
mm_cpumask() atomics at the very least, even if loading a new CR3 would
not be serializing.

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Re: linux-next: manual merge of the rcu tree with the tip tree "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-07-31 18:20 +0200
  Re: linux-next: manual merge of the rcu tree with the tip tree Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2017-08-01 02:10 +0200
    Re: linux-next: manual merge of the rcu tree with the tip tree "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-08-01 06:10 +0200
      Re: linux-next: manual merge of the rcu tree with the tip tree Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2017-08-01 06:30 +0200
        Re: linux-next: manual merge of the rcu tree with the tip tree "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-08-01 18:40 +0200
      Re: linux-next: manual merge of the rcu tree with the tip tree Andy Lutomirski <luto@kernel.org> - 2017-08-01 15:50 +0200
        Re: linux-next: manual merge of the rcu tree with the tip tree Peter Zijlstra <peterz@infradead.org> - 2017-08-01 16:00 +0200
          Re: linux-next: manual merge of the rcu tree with the tip tree Peter Zijlstra <peterz@infradead.org> - 2017-08-01 16:20 +0200
            Re: linux-next: manual merge of the rcu tree with the tip tree Andy Lutomirski <luto@kernel.org> - 2017-08-01 16:20 +0200
        Re: linux-next: manual merge of the rcu tree with the tip tree Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2017-08-01 16:10 +0200
          Re: linux-next: manual merge of the rcu tree with the tip tree Andy Lutomirski <luto@kernel.org> - 2017-08-01 16:20 +0200
            Re: linux-next: manual merge of the rcu tree with the tip tree Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2017-08-01 17:50 +0200
            Re: linux-next: manual merge of the rcu tree with the tip tree "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-08-01 23:40 +0200

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