Merge tag 'locking-core-2020-06-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull locking updates from Ingo Molnar:
 "The biggest change to core locking facilities in this cycle is the
  introduction of local_lock_t - this primitive comes from the -rt
  project and identifies CPU-local locking dependencies normally handled
  opaquely beind preempt_disable() or local_irq_save/disable() critical
  sections.

  The generated code on mainline kernels doesn't change as a result, but
  still there are benefits: improved debugging and better documentation
  of data structure accesses.

  The new local_lock_t primitives are introduced and then utilized in a
  couple of kernel subsystems. No change in functionality is intended.

  There's also other smaller changes and cleanups"

* tag 'locking-core-2020-06-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  zram: Use local lock to protect per-CPU data
  zram: Allocate struct zcomp_strm as per-CPU memory
  connector/cn_proc: Protect send_msg() with a local lock
  squashfs: Make use of local lock in multi_cpu decompressor
  mm/swap: Use local_lock for protection
  radix-tree: Use local_lock for protection
  locking: Introduce local_lock()
  locking/lockdep: Replace zero-length array with flexible-array
  locking/rtmutex: Remove unused rt_mutex_cmpxchg_relaxed()

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