linux-kernel - [RFC PATCH v1 0/2] Deduplicating RISCV cmpxchg.h macros

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 for Android: free password hash cracker in your pocket

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

Message-Id: <20230406082018.70367-1-leobras@redhat.com>
Date:   Thu,  6 Apr 2023 05:20:17 -0300
From:   Leonardo Bras <leobras@...hat.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Leonardo Bras <leobras@...hat.com>,
        Guo Ren <guoren@...nel.org>,
        Andrea Parri <parri.andrea@...il.com>,
        Conor Dooley <conor.dooley@...rochip.com>
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH v1 0/2] Deduplicating RISCV cmpxchg.h macros

While studying riscv's cmpxchg.h file, I got really interested in
understanding how RISCV asm implemented the different versions of
{cmp,}xchg.

When I understood the pattern, it made sense for me to remove the
duplications and create macros to make it easier to understand what exactly
changes between the versions: Instruction sufixes & barriers.

Thanks!
Leo

Changes since RFCv3:
- Squashed the 6 original patches in 2: one for cmpxchg and one for xchg
https://lore.kernel.org/all/20230404163741.2762165-1-leobras@redhat.com/

Changes since RFCv2:
- Fixed  macros that depend on having a local variable with a magic name
- Previous cast to (long) is now only applied on 4-bytes cmpxchg
https://lore.kernel.org/all/20230321074249.2221674-1-leobras@redhat.com/

Changes since RFCv1:
- Fixed patch 4/6 suffix from 'w.aqrl' to '.w.aqrl', to avoid build error
https://lore.kernel.org/all/20230318080059.1109286-1-leobras@redhat.com/

Leonardo Bras (2):
  riscv/cmpxchg: Deduplicate cmpxchg() asm and macros
  riscv/cmpxchg: Deduplicate xchg() asm functions

 arch/riscv/include/asm/cmpxchg.h | 319 +++++++------------------------
 1 file changed, 67 insertions(+), 252 deletions(-)

-- 
2.40.0