From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sun, 19 Sep 2021 20:11:19 +0000 (-0700)
Subject: Merge tag 'locking-urgent-2021-09-19' of git://git.kernel.org/pub/scm/linux/kernel... 
X-Git-Tag: accepted/tizen/unified/20230118.172025~6324
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f5e29a26c42b2c1b149118319a03bf937f168298;p=platform%2Fkernel%2Flinux-rpi.git

Merge tag 'locking-urgent-2021-09-19' of git://git./linux/kernel/git/tip/tip

Pull locking fixes from Thomas Gleixner:
 "A set of updates for the RT specific reader/writer locking base code:

   - Make the fast path reader ordering guarantees correct.

   - Code reshuffling to make the fix simpler"

[ This plays ugly games with atomic_add_return_release() because we
  don't have a plain atomic_add_release(), and should really be cleaned
  up, I think    - Linus ]

* tag 'locking-urgent-2021-09-19' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  locking/rwbase: Take care of ordering guarantee for fastpath reader
  locking/rwbase: Extract __rwbase_write_trylock()
  locking/rwbase: Properly match set_and_save_state() to restore_state()
---

f5e29a26c42b2c1b149118319a03bf937f168298