linux-kernel - [PATCH V3 0/5] riscv: atomic: Optimize AMO instructions usage

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Message-Id: <20220420144417.2453958-1-guoren@kernel.org>
Date:   Wed, 20 Apr 2022 22:44:12 +0800
From:   guoren@...nel.org
To:     guoren@...nel.org, arnd@...db.de, palmer@...belt.com,
        mark.rutland@....com, will@...nel.org, peterz@...radead.org,
        boqun.feng@...il.com, dlustig@...dia.com, parri.andrea@...il.com
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, Guo Ren <guoren@...ux.alibaba.com>
Subject: [PATCH V3 0/5] riscv: atomic: Optimize AMO instructions usage

From: Guo Ren <guoren@...ux.alibaba.com>

These patch series contain one cleanup and some optimizations for
atomic operations.

Changes in V3:
 - Fixup usage of lr.rl & sc.aq with violation of ISA
 - Add Optimize dec_if_positive functions
 - Add conditional atomic operations' optimization

Changes in V2:
 - Fixup LR/SC memory barrier semantic problems which pointed by
   Rutland
 - Combine patches into one patchset series
 - Separate AMO optimization & LRSC optimization for convenience
   patch review

Guo Ren (5):
  riscv: atomic: Cleanup unnecessary definition
  riscv: atomic: Optimize acquire and release for AMO operations
  riscv: atomic: Optimize memory barrier semantics of LRSC-pairs
  riscv: atomic: Optimize dec_if_positive functions
  riscv: atomic: Add conditional atomic operations' optimization

 arch/riscv/include/asm/atomic.h  | 168 ++++++++++++++++++++++++++++---
 arch/riscv/include/asm/cmpxchg.h |  30 ++----
 2 files changed, 160 insertions(+), 38 deletions(-)

-- 
2.25.1