(subset) [PATCH 0/6] powerpc/qspinlock: Fix yield latency bug and other

[Michael Ellerman]

On Mon, 16 Oct 2023 22:42:59 +1000, Nicholas Piggin wrote:
> This fixes a long-standing latency bug in the powerpc qspinlock
> implementation that quite a few people have reported and helped
> out with debugging.
> 
> The first patch is a minimal fix that avoids the problem. The
> other patches are streamlining and improvements after the fix.
> 
> [...]

Applied to powerpc/next.

[2/6] powerpc/qspinlock: stop queued waiters trying to set lock sleepy
      https://git.kernel.org/powerpc/c/f6568647382c667912245c8d07aa26c9c6d4d0c8
[3/6] powerpc/qspinlock: propagate owner preemptedness rather than CPU number
      https://git.kernel.org/powerpc/c/fd8fae50c9c6117c4e05954deab2cc515508666b
[4/6] powerpc/qspinlock: don't propagate the not-sleepy state
      https://git.kernel.org/powerpc/c/fcf77d44274b96a55cc74043561a4b3151b9ad24
[5/6] powerpc/qspinlock: Propagate sleepy if previous waiter is preempted
      https://git.kernel.org/powerpc/c/1e6d5f725738fff83e1c3cbdb8547142eb8820c2
[6/6] powerpc/qspinlock: Rename yield_propagate_owner tunable
      https://git.kernel.org/powerpc/c/b629b541702b082d161c307c9d7d9867911fc933

cheers