linux-kernel - [PATCH v2 00/10] Introduce cmpxchg128() -- aka. the demise of cmpxchg

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Date:   Thu, 02 Feb 2023 15:50:30 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     torvalds@...ux-foundation.org
Cc:     corbet@....net, will@...nel.org, peterz@...radead.org,
        boqun.feng@...il.com, mark.rutland@....com,
        catalin.marinas@....com, dennis@...nel.org, tj@...nel.org,
        cl@...ux.com, hca@...ux.ibm.com, gor@...ux.ibm.com,
        agordeev@...ux.ibm.com, borntraeger@...ux.ibm.com,
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        bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org,
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        robin.murphy@....com, dwmw2@...radead.org,
        baolu.lu@...ux.intel.com, Arnd Bergmann <arnd@...db.de>,
        Herbert Xu <herbert@...dor.apana.org.au>, davem@...emloft.net,
        penberg@...nel.org, rientjes@...gle.com, iamjoonsoo.kim@....com,
        Andrew Morton <akpm@...ux-foundation.org>, vbabka@...e.cz,
        roman.gushchin@...ux.dev, 42.hyeyoo@...il.com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
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        iommu@...ts.linux.dev, linux-arch@...r.kernel.org,
        linux-crypto@...r.kernel.org
Subject: [PATCH v2 00/10] Introduce cmpxchg128() -- aka. the demise of cmpxchg_double()

Hi!

Since Linus hated on cmpxchg_double(), a few patches to get rid of it, as
proposed here:

  https://lkml.kernel.org/r/Y2U3WdU61FvYlpUh@hirez.programming.kicks-ass.net


These patches are based on 6.2.0-rc6 + cryptodev-2.6, but also apply to next/master.

Available here:

  git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git core/wip-u128

New since v1:

 - rebaed on Eric's ghash cleanups (hence the cryptodev-2.6 dependency)
 - rebased on Heiko's s390/cpum_sf CDSG patch
 - fixed up a bunch of arch code
 - fixed up the inline asm to use 'u128 *' mem argument so the compiler knows
   how wide the modification is.
 - reworked the percpu thing to use union based type-punning instead of
   _Generic() based casts.

---
 Documentation/core-api/this_cpu_ops.rst     |   2 -
 arch/arm64/include/asm/atomic_ll_sc.h       |  56 ++++++-----
 arch/arm64/include/asm/atomic_lse.h         |  39 ++++----
 arch/arm64/include/asm/cmpxchg.h            |  48 +++-------
 arch/arm64/include/asm/percpu.h             |  31 ++++--
 arch/s390/include/asm/cmpxchg.h             |  32 ++-----
 arch/s390/include/asm/cpu_mf.h              |   2 +-
 arch/s390/include/asm/percpu.h              |  35 ++++---
 arch/s390/kernel/perf_cpum_sf.c             |  22 ++---
 arch/x86/include/asm/cmpxchg.h              |  25 -----
 arch/x86/include/asm/cmpxchg_32.h           |   2 +-
 arch/x86/include/asm/cmpxchg_64.h           |  54 ++++++++++-
 arch/x86/include/asm/percpu.h               |  97 +++++++++++--------
 drivers/iommu/amd/amd_iommu_types.h         |   9 +-
 drivers/iommu/amd/iommu.c                   |  10 +-
 drivers/iommu/intel/irq_remapping.c         |   8 +-
 include/asm-generic/percpu.h                |  62 ++----------
 include/crypto/b128ops.h                    |  14 +--
 include/linux/atomic/atomic-arch-fallback.h |  95 ++++++++++++++++++-
 include/linux/atomic/atomic-instrumented.h  |  88 ++++++++++++++---
 include/linux/dmar.h                        | 125 ++++++++++++------------
 include/linux/percpu-defs.h                 |  46 +++------
 include/linux/slub_def.h                    |  12 ++-
 include/linux/types.h                       |   5 +
 include/uapi/linux/types.h                  |   4 +
 lib/crypto/curve25519-hacl64.c              |   2 -
 lib/crypto/poly1305-donna64.c               |   2 -
 mm/slab.h                                   |  45 ++++++++-
 mm/slub.c                                   | 142 +++++++++++++++++-----------
 scripts/atomic/gen-atomic-fallback.sh       |   4 +-
 scripts/atomic/gen-atomic-instrumented.sh   |  21 ++--
 31 files changed, 645 insertions(+), 494 deletions(-)