Re: [PATCH -v2 5/7] locking/percpu-rwsem: Remove the embedded rwsem

[Christoph Hellwig]

On Fri, Jan 31, 2020 at 04:07:08PM +0100, Peter Zijlstra wrote:
> @@ -53,12 +53,6 @@ struct rw_semaphore {
>  #endif
>  };
>  
> -/*
> - * Setting all bits of the owner field except bit 0 will indicate
> - * that the rwsem is writer-owned with an unknown owner.
> - */
> -#define RWSEM_OWNER_UNKNOWN	(-2L)

Can you split the removal of the non-owned resem support into a separate
patch?  I still think keeping this one and moving aio to that scheme is
a better idea than the current ad-hoc locking scheme that has all kinds
of issues.