linux-kernel - [PATCH v3 0/4] riscv: Add qspinlock/qrwlock

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1616658937-82063-1-git-send-email-guoren@kernel.org>
Date:   Thu, 25 Mar 2021 07:55:33 +0000
From:   guoren@...nel.org
To:     guoren@...nel.org, Anup.Patel@....com
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-csky@...r.kernel.org, linux-arch@...r.kernel.org,
        tech-unixplatformspec@...ts.riscv.org,
        Guo Ren <guoren@...ux.alibaba.com>
Subject: [PATCH v3 0/4] riscv: Add qspinlock/qrwlock

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

Current riscv is still using baby spinlock implementation. It'll cause
fairness and cache line bouncing problems. Many people are involved
and pay the efforts to improve it:

 - The first version of patch was made in 2019.1:
   https://lore.kernel.org/linux-riscv/20190211043829.30096-1-michaeljclark@mac.com/#r

 - The second version was made in 2020.11:
   https://lore.kernel.org/linux-riscv/1606225437-22948-2-git-send-email-guoren@kernel.org/

 - A good discussion at Platform HSC.2021-03-08:
   https://drive.google.com/drive/folders/1ooqdnIsYx7XKor5O1XTtM6D1CHp4hc0p

Hope your comments and Tested-by or Co-developed-by or Reviewed-by ...

Let's kick the qspinlock into riscv right now (Also for the
architectures which doesn't have short atmoic xchg instructions.)

Change V3:
 - Fixup short-xchg asm code (slli -> slliw, srli -> srliw)
 - Coding convention by Peter Zijlstra's advices 

Change V2:
 - Coding convention in cmpxchg.h
 - Re-implement short xchg
 - Remove char & cmpxchg implementations

V1: (by michael)

Guo Ren (3):
  riscv: cmpxchg.h: Cleanup unused code
  riscv: cmpxchg.h: Merge macros
  riscv: cmpxchg.h: Implement xchg for short

Michael Clark (1):
  riscv: Convert custom spinlock/rwlock to generic qspinlock/qrwlock

 arch/riscv/Kconfig                      |   2 +
 arch/riscv/include/asm/Kbuild           |   3 +
 arch/riscv/include/asm/cmpxchg.h        | 211 ++++++------------------
 arch/riscv/include/asm/spinlock.h       | 126 +-------------
 arch/riscv/include/asm/spinlock_types.h |  15 +-
 5 files changed, 58 insertions(+), 299 deletions(-)

-- 
2.17.1