s390: don't use 128-bit cmpxchg for READ_ONCE() purposes

[PATCH 0/2] s390: don't use 128-bit cmpxchg for READ_ONCE() purposes

Heiko Carstens posted 2 patches 2 years, 6 months ago

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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

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[PATCH 0/2] s390: don't use 128-bit cmpxchg for READ_ONCE() purposes

Posted by Heiko Carstens 2 years, 6 months ago

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

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2.37.2