linux-kernel - [GIT PULL] Emulated one-byte cmpxchg() for ARM

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Message-ID: <52c8725d-7fdd-4fd5-a773-9a347a8837b2@paulmck-laptop>
Date: Sun, 14 Jul 2024 09:21:45 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: torvalds@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, kernel-team@...a.com,
	elver@...gle.com, akpm@...ux-foundation.org, tglx@...utronix.de,
	peterz@...radead.org, arnd@...db.de, broonie@...nel.org,
	naresh.kamboju@...aro.org, nathan@...nel.org,
	linus.walleij@...aro.org, rmk+kernel@...linux.org.uk, afd@...com,
	eric.devolder@...cle.com, robh@...nel.org, mark.rutland@....com
Subject: [GIT PULL] Emulated one-byte cmpxchg() for ARM

Hello, Linux,

Please pull the following cmpxchg()-related changes:

  git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git tags/cmpxchg.2024.07.12a
  # HEAD: f1b5644862c5b594f48ad01d7880a96b95d83a2f: ARM: Emulate one-byte cmpxchg (2024-07-04 13:32:41 -0700)

----------------------------------------------------------------
ARM: Provide one-byte cmpxchg emulation

This series provides emulated one-byte cmpxchg() support for ARM
using the cmpxchg_emu_u8() function that uses a four-byte cmpxchg()
to emulate the one-byte variant.

Similar patches for emulation of one-byte cmpxchg() for arc, sh, and
xtensa have not yet received maintainer acks, so they are slated for
the v6.12 merge window.

----------------------------------------------------------------
Paul E. McKenney (1):
      ARM: Emulate one-byte cmpxchg

 arch/arm/Kconfig               | 1 +
 arch/arm/include/asm/cmpxchg.h | 7 ++++++-
 2 files changed, 7 insertions(+), 1 deletion(-)