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From:   Andrea Parri <parri.andrea@gmail.com>
To:     Palmer Dabbelt <palmer@sifive.com>, Albert Ou <albert@sifive.com>
Cc:     Daniel Lustig <dlustig@nvidia.com>,
        Alan Stern <stern@rowland.harvard.edu>,
        Will Deacon <will.deacon@arm.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Boqun Feng <boqun.feng@gmail.com>,
        Nicholas Piggin <npiggin@gmail.com>,
        David Howells <dhowells@redhat.com>,
        Jade Alglave <j.alglave@ucl.ac.uk>,
        Luc Maranget <luc.maranget@inria.fr>,
        Paul McKenney <paulmck@linux.vnet.ibm.com>,
        Akira Yokosawa <akiyks@gmail.com>,
        Ingo Molnar <mingo@kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
        Andrea Parri <parri.andrea@gmail.com>
Subject: [PATCH v2 0/2] riscv/spinlock,atomic: Miscellaneous fixes
Date:   Fri,  9 Mar 2018 13:12:39 +0100
Message-Id: <1520597559-16547-1-git-send-email-parri.andrea@gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hi,

The series is a follow-up on the discussion in [1], which led to the
discovery of a few issues in the current implementations of RISC-V
locking and atomic operations.

In summary, this series proposes the following modifications:

  1. Use lightweigth fences for acquire/release (locking, atomics)

  2. Use the combination of .rl and full fences for fully-ordered
     atomics implemented with LR/SC pairs.

  3. A few style changes (80-chars lines, alignment).

Applies on top of "next-smp_sl_ar".

Cheers,
  Andrea

Changes since v1 [2]:
  - correct implementation of atomic_{xchg,cmpxchg}_release().

[1] https://marc.info/?l=linux-kernel&m=151930201102853&w=2
[2] https://marc.info/?l=linux-kernel&m=152027423529883&w=2

Andrea Parri (2):
  riscv/spinlock: Strengthen implementations with fences
  riscv/atomic: Strengthen implementations with fences

 arch/riscv/include/asm/atomic.h   | 417 ++++++++++++++++++++++++--------------
 arch/riscv/include/asm/cmpxchg.h  | 391 ++++++++++++++++++++++++++++-------
 arch/riscv/include/asm/fence.h    |  12 ++
 arch/riscv/include/asm/spinlock.h |  29 +--
 4 files changed, 615 insertions(+), 234 deletions(-)
 create mode 100644 arch/riscv/include/asm/fence.h

-- 
2.7.4