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

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [v3,11/41] mips: reuse asm-generic/barrier.h
Date 2016-01-13 21:50 +0100
Message-ID <qQAwG-50b-31@gated-at.bofh.it> (permalink)
References (4 earlier) <qQ4Gu-8a9-17@gated-at.bofh.it> <qQ5Cy-jP-25@gated-at.bofh.it> <qQe38-69u-17@gated-at.bofh.it> <qQra1-6Tj-11@gated-at.bofh.it> <qQyXU-41l-9@gated-at.bofh.it>
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On Wed, Jan 13, 2016 at 11:02:35AM -0800, Leonid Yegoshin wrote:

> I ask HW team about it but I have a question - has it any relationship with
> replacing MIPS SYNC with lightweight SYNCs (SYNC_WMB etc)?

Of course. If you cannot explain the semantics of the primitives you
introduce, how can we judge the patch.

This barrier business is hard enough as it is, but magic unexplained
hardware makes it impossible.

Rest assured, you (MIPS) isn't the first (nor likely the last) to go
through all this. We've had these discussions (and to a certain extend
are still having them) for x86, PPC, Alpha, ARM, etc..

Any every time new barriers instructions get introduced we had better
have a full and comprehensive explanation to go along with them.

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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 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 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
  [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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