[PATCH RFC] pidfs: use maple tree

[Christian Brauner]

On Fri, Dec 06, 2024 at 03:46:37PM +0000, Matthew Wilcox wrote:
> On Fri, Dec 06, 2024 at 04:25:13PM +0100, Christian Brauner wrote:
> > For the pidfs inode maple tree we use an external lock for add and
> 
> Please don't.  We want to get rid of it.  That's a hack that only exists
> for the VMA tree.

Hm, ok. Then I'll stick with idr for now because we can simply use
pidmap_lock. Otherwise we'd have to introduce more locking.