[PATCH RFC] pidfs: use maple tree

[Matthew Wilcox]

On Fri, Dec 06, 2024 at 05:03:03PM +0100, Christian Brauner wrote:
> 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.

Why can you not delete pidmap_lock and use the maple tree lock
everywhere that you currently use pidmap_lock?  That's the intended
way to use it.