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Re: [v3,11/41] mips: reuse asm-generic/barrier.h

From Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Newsgroups linux.kernel
Subject Re: [v3,11/41] mips: reuse asm-generic/barrier.h
Date 2016-01-15 20:00 +0100
Message-ID <qRhLk-1DX-9@gated-at.bofh.it> (permalink)
References (6 earlier) <qQWxb-3FW-9@gated-at.bofh.it> <qQX0d-3S8-1@gated-at.bofh.it> <qQXCX-4lN-21@gated-at.bofh.it> <qQYz0-5b5-11@gated-at.bofh.it> <qR9kK-4iA-19@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On 01/15/2016 01:57 AM, Will Deacon wrote:
> Paul,
>
>
> I think you figured this out while I was sleeping, but just to confirm:
>
>   1. The MIPS64 ISA doc [1] talks about SYNC in a way that applies only
>      to memory accesses appearing in *program-order* before the SYNC
>
>   2. We need WRC+sync+addr to work, which means that the SYNC in P1 must
>      also capture the store in P0 as being "before" the barrier. Leonid
>      reckons it works, but his explanation [2] focussed on the address
>      dependency in P2 as to why this works. If that is the case (i.e.
>      address dependency provides global transitivity), then WRC+addr+addr
>      should also work (even though its not required).

No, it is not correct. There is one old design which provides access to 
core (thread0 + thread1) write-buffers for threads load in advance of it 
is visible to other cores. It means, that WRC+sync+addr passes because 
of SYNC in write thread and register dependency inside other thread but 
WRC+addr+addr may fail because other core may get a stale data.

>
>   3. It seems that WRC+addr+addr doesn't work, so I'm still suspicious
>      about WRC+sync+addr, because neither the architecture document or
>      Leonid's explanation tell me that it should be forbidden.
>
> Will
>
> [1] https://imgtec.com/?do-download=4302
> [2] http://lkml.kernel.org/r/569565DA.2010903@imgtec.com (scroll to the end)

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[PATCH v3 00/41] arch: barrier cleanup + barriers for virt "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:20 +0100
  [PATCH v3 06/41] s390: reuse asm-generic/barrier.h "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:20 +0100
  [PATCH v3 13/41] x86: reuse asm-generic/barrier.h "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:20 +0100
    Re: [PATCH v3 13/41] x86: reuse asm-generic/barrier.h Thomas Gleixner <tglx@linutronix.de> - 2016-01-12 15:20 +0100
  [PATCH v3 08/41] arm: reuse asm-generic/barrier.h "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:20 +0100
  [PATCH v3 21/41] mips: define __smp_xxx "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:20 +0100
  [PATCH v3 03/41] ia64: rename nop->iosapic_nop "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:20 +0100
  [PATCH v3 07/41] sparc: reuse asm-generic/barrier.h "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:20 +0100
  [PATCH v3 15/41] powerpc: define __smp_xxx "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:20 +0100
  [PATCH v3 12/41] x86/um: reuse asm-generic/barrier.h "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:20 +0100
  [PATCH v3 22/41] s390: define __smp_xxx "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:20 +0100
  [PATCH v3 11/41] mips: reuse asm-generic/barrier.h "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:20 +0100
    Re: [v3,11/41] mips: reuse asm-generic/barrier.h Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> - 2016-01-12 02:20 +0100
      Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-12 09:50 +0100
        Re: [v3,11/41] mips: reuse asm-generic/barrier.h Peter Zijlstra <peterz@infradead.org> - 2016-01-12 11:00 +0100
      Re: [v3,11/41] mips: reuse asm-generic/barrier.h Peter Zijlstra <peterz@infradead.org> - 2016-01-12 10:30 +0100
        Re: [v3,11/41] mips: reuse asm-generic/barrier.h Peter Zijlstra <peterz@infradead.org> - 2016-01-12 11:30 +0100
          Re: [v3,11/41] mips: reuse asm-generic/barrier.h Peter Zijlstra <peterz@infradead.org> - 2016-01-12 11:50 +0100
            Re: [v3,11/41] mips: reuse asm-generic/barrier.h Will Deacon <will.deacon@arm.com> - 2016-01-12 12:50 +0100
              Re: [v3,11/41] mips: reuse asm-generic/barrier.h Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> - 2016-01-12 21:50 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Peter Zijlstra <peterz@infradead.org> - 2016-01-12 22:50 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> - 2016-01-13 01:30 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Will Deacon <will.deacon@arm.com> - 2016-01-13 11:50 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> - 2016-01-13 20:10 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Peter Zijlstra <peterz@infradead.org> - 2016-01-13 21:50 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> - 2016-01-13 22:00 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Will Deacon <will.deacon@arm.com> - 2016-01-14 13:10 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-14 18:40 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> - 2016-01-14 20:50 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Peter Zijlstra <peterz@infradead.org> - 2016-01-14 21:20 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-14 21:40 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Peter Zijlstra <peterz@infradead.org> - 2016-01-14 21:50 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> - 2016-01-14 21:50 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-14 22:40 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> - 2016-01-14 22:50 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-14 23:30 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> - 2016-01-15 00:10 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> - 2016-01-14 21:20 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-14 21:50 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> - 2016-01-14 22:30 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-14 23:30 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Will Deacon <will.deacon@arm.com> - 2016-01-15 11:00 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> - 2016-01-15 20:00 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Peter Zijlstra <peterz@infradead.org> - 2016-01-26 11:30 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Peter Zijlstra <peterz@infradead.org> - 2016-01-26 11:40 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Will Deacon <will.deacon@arm.com> - 2016-01-26 12:10 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-26 23:10 +0100
                [PATCH] documentation: Add disclaimer Peter Zijlstra <peterz@infradead.org> - 2016-01-27 09:40 +0100
                Re: [PATCH] documentation: Add disclaimer Will Deacon <will.deacon@arm.com> - 2016-01-27 11:20 +0100
                Re: [PATCH] documentation: Add disclaimer David Howells <dhowells@redhat.com> - 2016-01-27 16:00 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-26 23:10 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Herbert Xu <herbert@gondor.apana.org.au> - 2016-01-18 09:30 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-18 16:50 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Boqun Feng <boqun.feng@gmail.com> - 2016-01-26 18:00 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Peter Zijlstra <peterz@infradead.org> - 2016-01-26 18:30 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Linus Torvalds <torvalds@linux-foundation.org> - 2016-01-26 20:50 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-26 23:10 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Linus Torvalds <torvalds@linux-foundation.org> - 2016-01-26 23:20 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Linus Torvalds <torvalds@linux-foundation.org> - 2016-01-26 23:40 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-27 00:30 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Linus Torvalds <torvalds@linux-foundation.org> - 2016-01-27 00:50 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-27 02:00 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Boqun Feng <boqun.feng@gmail.com> - 2016-01-27 03:10 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Peter Zijlstra <peterz@infradead.org> - 2016-01-27 09:00 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-26 23:10 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> - 2016-01-13 23:30 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-14 10:30 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Will Deacon <will.deacon@arm.com> - 2016-01-14 13:20 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> - 2016-01-14 20:30 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-14 21:40 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> - 2016-01-14 22:10 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-14 22:30 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> - 2016-01-14 22:40 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-15 00:00 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> - 2016-01-15 00:40 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-15 01:50 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> - 2016-01-15 02:10 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Maciej W. Rozycki" <macro@imgtec.com> - 2016-01-27 12:30 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Ralf Baechle <ralf@linux-mips.org> - 2016-01-27 11:50 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Maciej W. Rozycki" <macro@imgtec.com> - 2016-01-27 13:10 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Will Deacon <will.deacon@arm.com> - 2016-01-15 11:30 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-15 19:00 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-15 20:30 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Will Deacon <will.deacon@arm.com> - 2016-01-25 15:50 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-26 06:40 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Will Deacon <will.deacon@arm.com> - 2016-01-26 13:20 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-27 00:40 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Will Deacon <will.deacon@arm.com> - 2016-01-27 11:30 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Peter Zijlstra <peterz@infradead.org> - 2016-01-15 10:00 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Peter Zijlstra <peterz@infradead.org> - 2016-01-15 10:20 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-15 19:00 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Peter Zijlstra <peterz@infradead.org> - 2016-01-15 22:30 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-15 23:00 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Will Deacon <will.deacon@arm.com> - 2016-01-25 17:50 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-26 07:10 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Peter Zijlstra <peterz@infradead.org> - 2016-01-26 11:20 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-26 23:10 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Peter Zijlstra <peterz@infradead.org> - 2016-01-27 09:40 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Will Deacon <will.deacon@arm.com> - 2016-01-26 13:20 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Boqun Feng <boqun.feng@gmail.com> - 2016-01-26 15:40 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-26 23:10 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Will Deacon <will.deacon@arm.com> - 2016-01-27 11:30 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-15 18:50 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Peter Zijlstra <peterz@infradead.org> - 2016-01-15 22:30 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-15 23:10 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Will Deacon <will.deacon@arm.com> - 2016-01-25 19:10 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-26 07:20 +0100
                Re: [v3,11/41] mips: reuse asm-generic/barrier.h Peter Zijlstra <peterz@infradead.org> - 2016-01-26 11:20 +0100
  [PATCH v3 17/41] arm: define __smp_xxx "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:20 +0100
  [PATCH v3 14/41] asm-generic: add __smp_xxx wrappers "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:20 +0100
  [PATCH v3 09/41] arm64: reuse asm-generic/barrier.h "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:20 +0100
  [PATCH v3 18/41] blackfin: define __smp_xxx "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:20 +0100
  [PATCH v3 16/41] arm64: define __smp_xxx "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:20 +0100
  [PATCH v3 20/41] metag: define __smp_xxx "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:20 +0100
  [PATCH v3 35/41] checkpatch: check for __smp outside barrier.h "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
  [PATCH v3 38/41] xen/io: use virt_xxx barriers "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
  [PATCH v3 36/41] checkpatch: add virt barriers "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
  [PATCH v3 26/41] xtensa: define __smp_xxx "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
  [PATCH v3 28/41] asm-generic: implement virt_xxx memory barriers "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
  [PATCH v3 37/41] xenbus: use virt_xxx barriers "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
  [PATCH v3 24/41] sparc: define __smp_xxx "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
  [PATCH v3 40/41] s390: use generic memory barriers "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
  [PATCH v3 25/41] tile: define __smp_xxx "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
  [PATCH v3 29/41] Revert "virtio_ring: Update weak barriers to use  dma_wmb/rmb" "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
  [PATCH v3 34/41] checkpatch.pl: add missing memory barriers "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
  [PATCH v3 41/41] s390: more efficient smp barriers "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
  [PATCH v3 33/41] virtio_ring: use virt_store_mb "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
  [PATCH v3 01/41] lcoking/barriers, arch: Use smp barriers in  smp_store_release() "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
    Re: [PATCH v3 01/41] lcoking/barriers, arch: Use smp barriers in  smp_store_release() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-01-12 17:30 +0100
      Re: [PATCH v3 01/41] lcoking/barriers, arch: Use smp barriers in  smp_store_release() "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-12 19:50 +0100
  [PATCH v3 30/41] virtio_ring: update weak barriers to use virt_xxx "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
  [PATCH v3 32/41] sh: move xchg_cmpxchg to a header by itself "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
  [PATCH v3 23/41] sh: define __smp_xxx, fix smp_store_mb for !SMP "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
  [PATCH v3 27/41] x86: define __smp_xxx "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
    Re: [PATCH v3 27/41] x86: define __smp_xxx Thomas Gleixner <tglx@linutronix.de> - 2016-01-12 15:20 +0100
  [PATCH v3 39/41] xen/events: use virt_xxx barriers "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
    Re: [PATCH v3 39/41] xen/events: use virt_xxx barriers David Vrabel <david.vrabel@citrix.com> - 2016-01-11 12:20 +0100
  [PATCH v3 31/41] sh: support 1 and 2 byte xchg "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-10 15:30 +0100
  Re: [PATCH v3 00/41] arch: barrier cleanup + barriers for virt Peter Zijlstra <peterz@infradead.org> - 2016-01-12 14:00 +0100

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