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

Peter Zijlstra
2023-02-02T15:31:42Z

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(-)