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

[Nysal Jan K.A.]

On Mon, Oct 16, 2023 at 10:42:59PM +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.
> 
> Thanks,
> Nick
> 
> Nicholas Piggin (6):
>   powerpc/qspinlock: Fix stale propagated yield_cpu
>   powerpc/qspinlock: stop queued waiters trying to set lock sleepy
>   powerpc/qspinlock: propagate owner preemptedness rather than CPU
>     number
>   powerpc/qspinlock: don't propagate the not-sleepy state
>   powerpc/qspinlock: Propagate sleepy if previous waiter is preempted
>   powerpc/qspinlock: Rename yield_propagate_owner tunable
> 
>  arch/powerpc/lib/qspinlock.c | 119 +++++++++++++++--------------------
>  1 file changed, 52 insertions(+), 67 deletions(-)
> 
> -- 
> 2.42.0
> 
Just a minor comment regarding patch 2.

For the series:

Reviewed-by: Nysal Jan K.A <nysal at linux.ibm.com>