Re: [PATCH 3/3] blk-mq: Use llist_head for blk_cpu_done

[Christoph Hellwig]

On Thu, Oct 29, 2020 at 03:56:23PM +0100, Sebastian Andrzej Siewior wrote:
> On 2020-10-29 14:05:36 [+0000], Christoph Hellwig wrote:
> > Well, usb-storage obviously seems to do it, and the block layer
> > does not prohibit it.
> 
> Also loop, nvme-tcp and then I stopped looking.
> Any objections about adding local_bh_disable() around it?

To me it seems like the whole IPI plus potentially softirq dance is
a little pointless when completing from process context.

Sagi, any opinion on that from the nvme-tcp POV?