linux-kernel - [RFC PATCH for 4.15 0/6] membarrier updates for 4.15

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Date:   Wed,  8 Nov 2017 13:35:08 -0500
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Andrew Hunter <ahh@...gle.com>,
        Maged Michael <maged.michael@...il.com>, gromer@...gle.com,
        Avi Kivity <avi@...lladb.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Dave Watson <davejwatson@...com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Andrea Parri <parri.andrea@...il.com>, x86@...nel.org,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: [RFC PATCH for 4.15 0/6] membarrier updates for 4.15

Here are the membarrier changes I plan on sending for the
4.15 merge window.

This series includes selftests improvements for sys_membarrier,
improvement of powerpc handling of the memory barrier required
by sys_membarrier in switch_mm(), and adds a new core serializing
membarrier, currently only implemented on x86. Architectures
wishing to provide the core serializing membarrier need to
select ARCH_HAS_MEMBARRIER_SYNC_CORE and document how they
provide the core serialization required by that command in their
architecture code.

Andy, I know you told me you had changes coming up in x86 entry.S
for 4.15, but I figure that managing the merge conflict between your
changes in 4.15 and those added comments should be straightforward.
Anyway, I kind of suspect that at any given point in time you will
always have changes of some sort to propose to entry.S, so now seems
to be a time as appropriate as ever to push the core serializing
membarrier comments.

Feedback is welcome!

Thanks,

Mathieu

Mathieu Desnoyers (6):
  membarrier: selftest: Test private expedited cmd
  membarrier: powerpc: Skip memory barrier in switch_mm() (v6)
  membarrier: Document scheduler barrier requirements (v5)
  membarrier: Provide core serializing command
  membarrier: x86: Provide core serializing command
  membarrier: selftest: Test private expedited sync core cmd

 MAINTAINERS                                        |   2 +
 arch/powerpc/Kconfig                               |   1 +
 arch/powerpc/include/asm/membarrier.h              |  32 ++++
 arch/powerpc/kernel/Makefile                       |   2 +
 arch/powerpc/kernel/membarrier.c                   |  37 ++++
 arch/powerpc/mm/mmu_context.c                      |   7 +
 arch/x86/Kconfig                                   |   2 +
 arch/x86/entry/entry_32.S                          |   5 +
 arch/x86/entry/entry_64.S                          |   8 +
 arch/x86/include/asm/membarrier.h                  |  36 ++++
 arch/x86/kernel/Makefile                           |   1 +
 arch/x86/kernel/membarrier.c                       |  39 +++++
 arch/x86/mm/tlb.c                                  |   6 +
 include/linux/sched/mm.h                           |  36 +++-
 include/uapi/linux/membarrier.h                    |  14 +-
 init/Kconfig                                       |   6 +
 kernel/sched/core.c                                |  53 +++---
 kernel/sched/membarrier.c                          |  55 ++++--
 .../testing/selftests/membarrier/membarrier_test.c | 186 +++++++++++++++++++--
 19 files changed, 470 insertions(+), 58 deletions(-)
 create mode 100644 arch/powerpc/include/asm/membarrier.h
 create mode 100644 arch/powerpc/kernel/membarrier.c
 create mode 100644 arch/x86/include/asm/membarrier.h
 create mode 100644 arch/x86/kernel/membarrier.c

-- 
2.11.0