[PATCH] nvme-pci: silence a lockdep complaint

[Christoph Hellwig]

On Thu, May 23, 2024 at 01:04:13PM +0300, Sagi Grimberg wrote:
>
>
> On 23/05/2024 9:54, Christoph Hellwig wrote:
>> On Wed, May 22, 2024 at 03:36:19PM -0600, Keith Busch wrote:
>>> The below patch is what I'm messing with. I have a CMIC PCI NVMe and
>>> nvme native multipathing enabled, and that can recreate the lockdep
>>> splat 100% of the time. It goes away with this patch. Non-multipath
>>> devices are harder to hit the lockdep splat for a different reason.
>> I much prefer the srcu locking as it has real benefits as well over
>> a global-ish rwsem.  I'll try to get to a real review in a bit.
>>
>
> Can you explain what are these benefits?

No having a global lock taken for namespace lookups.