linux-kernel - [RFC PATCH 0/2] riscv/spinlock,atomic: Miscellaneous fixes

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Date:   Mon,  5 Mar 2018 19:23:30 +0100
From:   Andrea Parri <parri.andrea@...il.com>
To:     Palmer Dabbelt <palmer@...ive.com>, Albert Ou <albert@...ive.com>
Cc:     Daniel Lustig <dlustig@...dia.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Will Deacon <will.deacon@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Nicholas Piggin <npiggin@...il.com>,
        David Howells <dhowells@...hat.com>,
        Jade Alglave <j.alglave@....ac.uk>,
        Luc Maranget <luc.maranget@...ia.fr>,
        Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        Akira Yokosawa <akiyks@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Andrea Parri <parri.andrea@...il.com>
Subject: [RFC PATCH 0/2] riscv/spinlock,atomic: Miscellaneous fixes

Hi,

This RFC 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

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