Merge tag 'cmpxchg-emu.2026.10.12b' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu

Pull two-byte cmpxchg emulation from Paul McKenney:
 "These commits add a cmpxchg_emu_u16() function that emulates two-byte
  cmpxchg() in terms of four-byte cmpxchg() for architectures not having
  native instructions for this purpose. They also make use of this
  cmpxchg_emu_u16() function in those architectures, namely sh, arc,
  csky, and xtensa. This permits use of two-byte cmpxchg() in common
  code.

  However, it sadly does not permit easy implementation of all
  algorithms needing on two-byte atomic operations because there are
  some systems still supported by Linux that do not have native two-byte
  store instructions.

  There is reason to believe that these systems will soon no longer be
  supported by Linux [1]"

Link: https://lore.kernel.org/all/20260908152808.3928630-4-arnd@kernel.org/ [1]

* tag 'cmpxchg-emu.2026.10.12b' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu:
  xtensa: Emulate two-byte cmpxchg
  csky: Emulate two-byte cmpxchg
  ARC: Emulate two-byte cmpxchg
  sh: Emulate two-byte cmpxchg
  lib: Add two-byte cmpxchg emulation function

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