linux-kernel - [PATCH 0/2] s390: don't use 128-bit cmpxchg for READ

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Date:   Fri, 24 Feb 2023 11:02:35 +0100
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Thomas Richter <tmricht@...ux.ibm.com>
Cc:     Sven Schnelle <svens@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] s390: don't use 128-bit cmpxchg for READ_ONCE() purposes

Introduce and use an s390 specific READ_ONCE_ALIGNED_128() macro in order
to get rid of the odd 128-bit cmpxchg READ_ONCE() usage in cpum_sf, which
was introduced with commit 82d3edb50a11 ("s390/cpum_sf: add READ_ONCE()
semantics to compare and swap loops").

Heiko Carstens (2):
  s390/rwonce: add READ_ONCE_ALIGNED_128() macro
  s390/cpum_sf: use READ_ONCE_ALIGNED_128() instead of 128-bit cmpxchg

 arch/s390/include/asm/rwonce.h  | 31 +++++++++++++++++++++++++++++++
 arch/s390/kernel/perf_cpum_sf.c |  9 +++------
 2 files changed, 34 insertions(+), 6 deletions(-)
 create mode 100644 arch/s390/include/asm/rwonce.h

-- 
2.37.2