From: Heiko Carstens <hca@linux.ibm.com>
To: Vasily Gorbik <gor@linux.ibm.com>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Thomas Richter <tmricht@linux.ibm.com>
Cc: Sven Schnelle <svens@linux.ibm.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Peter Zijlstra <peterz@infradead.org>,
linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 0/2] s390: don't use 128-bit cmpxchg for READ_ONCE() purposes
Date: Fri, 24 Feb 2023 11:02:35 +0100 [thread overview]
Message-ID: <20230224100237.3247871-1-hca@linux.ibm.com> (raw)
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
next reply other threads:[~2023-02-24 10:04 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-24 10:02 Heiko Carstens [this message]
2023-02-24 10:02 ` [PATCH 1/2] s390/rwonce: add READ_ONCE_ALIGNED_128() macro Heiko Carstens
2023-02-25 16:50 ` Peter Zijlstra
2023-02-26 20:56 ` Heiko Carstens
2023-02-27 11:51 ` Peter Zijlstra
2023-02-24 10:02 ` [PATCH 2/2] s390/cpum_sf: use READ_ONCE_ALIGNED_128() instead of 128-bit cmpxchg Heiko Carstens
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