Re: [PATCH V5 0/4] blk-mq: implement queue quiesce via percpu_ref for BLK_MQ_F_BLOCKING

[Sagi Grimberg <sagi@xxxxxxxxxxx>]

> > Hi Jens,
> >
> > The 1st patch add .mq_quiesce_mutex for serializing quiesce/unquiesce,
> > and prepares for replacing srcu with percpu_ref.
> >
> > The 2nd patch replaces srcu with percpu_ref.
> >
> > The 3rd patch adds tagset quiesce interface.
> >
> > The 4th patch applies tagset quiesce interface for NVMe subsystem.
>
> What is this series against?

It didn't apply cleanly to me too until I realized it is
on top of v4 of: "percpu_ref & block: reduce memory footprint of 
percpu_ref in fast path"