[GIT PULL] locking changes for v6.4

[Ingo Molnar]

Linus,

Please pull the latest locking/core git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking-core-2023-04-27

   # HEAD: 93eff603d6a2bc1895eeb7063dbd0661bb760b74 locking/atomic: Correct (cmp)xhcg instrumentation

Locking changes in v6.4:

 - Introduce local{,64}_try_cmpxchg() - a slightly more optimal
   primitive, which will be used in perf events ring-buffer code.

 - Add more atomic_add_negative() variants, used by rcuref:

 - Add rcuref - A scalable reference count implementation for RCU managed objects

 - Add non-atomic __xchg() variant, use it in a couple of places

 - Misc cleanups and fixes.


NOTE: the internal merge commit of locking/rcuref [1afa833d607b6] merging 
      two commits from a WIP branch has no explanation. I noticed this too
      late, and we can re-do this tree if it's an issue.

 Thanks,

	Ingo

------------------>
Andrzej Hajda (5):
      arch: rename all internal names __xchg to __arch_xchg
      linux/include: add non-atomic version of xchg
      arch/*/uprobes: simplify arch_uretprobe_hijack_return_addr
      llist: simplify __llist_del_all
      drm/i915/gt: use __xchg instead of internal helper

Mark Rutland (1):
      locking/atomic: Correct (cmp)xhcg instrumentation

Sebastian Andrzej Siewior (1):
      locking/rwbase: Mitigate indefinite writer starvation.

Thomas Gleixner (2):
      atomics: Provide atomic_add_negative() variants
      atomics: Provide rcuref - scalable reference counting

Uros Bizjak (4):
      locking/atomic: Add generic try_cmpxchg{,64}_local support
      locking/generic: Wire up local{,64}_try_cmpxchg
      locking/arch: Wire up local_try_cmpxchg
      locking/x86: Define arch_try_cmpxchg_local


 arch/alpha/include/asm/cmpxchg.h                   |  10 +-
 arch/alpha/include/asm/local.h                     |  12 +-
 arch/arc/include/asm/cmpxchg.h                     |   4 +-
 arch/arm/include/asm/cmpxchg.h                     |   7 +-
 arch/arm/probes/uprobes/core.c                     |   8 +-
 arch/arm64/include/asm/cmpxchg.h                   |   7 +-
 arch/arm64/kernel/probes/uprobes.c                 |   9 +-
 arch/csky/kernel/probes/uprobes.c                  |   9 +-
 arch/hexagon/include/asm/cmpxchg.h                 |  10 +-
 arch/ia64/include/asm/cmpxchg.h                    |   2 +-
 arch/ia64/include/uapi/asm/cmpxchg.h               |   4 +-
 arch/loongarch/include/asm/cmpxchg.h               |   4 +-
 arch/loongarch/include/asm/local.h                 |  13 +-
 arch/m68k/include/asm/cmpxchg.h                    |   6 +-
 arch/mips/include/asm/cmpxchg.h                    |   4 +-
 arch/mips/include/asm/local.h                      |  13 +-
 arch/mips/kernel/uprobes.c                         |  10 +-
 arch/openrisc/include/asm/cmpxchg.h                |  10 +-
 arch/parisc/include/asm/cmpxchg.h                  |   4 +-
 arch/powerpc/include/asm/cmpxchg.h                 |   4 +-
 arch/powerpc/include/asm/local.h                   |  11 +
 arch/powerpc/kernel/uprobes.c                      |  10 +-
 arch/riscv/include/asm/atomic.h                    |   2 +-
 arch/riscv/include/asm/cmpxchg.h                   |   4 +-
 arch/riscv/kernel/probes/uprobes.c                 |   9 +-
 arch/s390/include/asm/cmpxchg.h                    |   8 +-
 arch/s390/kernel/uprobes.c                         |   7 +-
 arch/sh/include/asm/cmpxchg.h                      |   4 +-
 arch/sparc/include/asm/cmpxchg_32.h                |   4 +-
 arch/sparc/include/asm/cmpxchg_64.h                |   6 +-
 arch/sparc/kernel/uprobes.c                        |   7 +-
 arch/x86/include/asm/cmpxchg.h                     |   6 +
 arch/x86/include/asm/local.h                       |  13 +-
 arch/xtensa/include/asm/cmpxchg.h                  |   4 +-
 drivers/gpu/drm/i915/gt/intel_engine_cs.c          |   2 +-
 drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c   |   4 +-
 .../gpu/drm/i915/gt/intel_execlists_submission.c   |   4 +-
 drivers/gpu/drm/i915/gt/intel_ggtt.c               |   4 +-
 drivers/gpu/drm/i915/gt/intel_gsc.c                |   2 +-
 drivers/gpu/drm/i915/gt/intel_gt.c                 |   4 +-
 drivers/gpu/drm/i915/gt/intel_gt_pm.c              |   2 +-
 drivers/gpu/drm/i915/gt/intel_lrc.c                |   6 +-
 drivers/gpu/drm/i915/gt/intel_migrate.c            |   2 +-
 drivers/gpu/drm/i915/gt/intel_rc6.c                |   2 +-
 drivers/gpu/drm/i915/gt/intel_rps.c                |   2 +-
 drivers/gpu/drm/i915/gt/selftest_context.c         |   2 +-
 drivers/gpu/drm/i915/gt/selftest_ring_submission.c |   2 +-
 drivers/gpu/drm/i915/gt/selftest_timeline.c        |   2 +-
 drivers/gpu/drm/i915/gt/uc/intel_uc.c              |   2 +-
 drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c           |   2 +-
 drivers/gpu/drm/i915/i915_utils.h                  |   1 +
 include/asm-generic/local.h                        |   1 +
 include/asm-generic/local64.h                      |  12 +-
 include/linux/atomic/atomic-arch-fallback.h        | 230 ++++++++++++++++-
 include/linux/atomic/atomic-instrumented.h         | 152 ++++++++---
 include/linux/atomic/atomic-long.h                 |  38 ++-
 include/linux/llist.h                              |   6 +-
 include/linux/non-atomic/xchg.h                    |  19 ++
 include/linux/rcuref.h                             | 155 ++++++++++++
 include/linux/types.h                              |   6 +
 kernel/locking/rwbase_rt.c                         |   9 -
 lib/Makefile                                       |   2 +-
 lib/rcuref.c                                       | 281 +++++++++++++++++++++
 scripts/atomic/atomics.tbl                         |   2 +-
 scripts/atomic/fallbacks/add_negative              |  11 +-
 scripts/atomic/gen-atomic-fallback.sh              |   4 +
 scripts/atomic/gen-atomic-instrumented.sh          |   8 +-
 67 files changed, 1019 insertions(+), 207 deletions(-)
 create mode 100644 include/linux/non-atomic/xchg.h
 create mode 100644 include/linux/rcuref.h
 create mode 100644 lib/rcuref.c