Re: [PATCH] testing/radix-tree/maple: hack around kfree_rcu not existing

[Lorenzo Stoakes]

On Fri, Aug 15, 2025 at 05:28:02AM +0100, Lorenzo Stoakes wrote:
> On Thu, Aug 14, 2025 at 10:09:15PM -0400, Liam R. Howlett wrote:
> > * Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> [250814 21:02]:
> > > Well, can we have this as a standalone thing, rather than as a
> > > modification to a patch whose future is uncertain?
> > >
> > > Then we can just drop "testing/radix-tree/maple: hack around kfree_rcu
> > > not existing", yes?
> > >
> > > Some expansion of "fixes the build for the VMA userland tests" would be
> > > helpful.
> >
> > Ah, this is somewhat messy.
> >
> > Pedro removed unnecessary rcu calls with the newer slab reality as you
> > can directly call kfree instead of specifying the kmem_cache.
> >
> > But the patch is partially already in Vlastimil's sheaves work and we'd
> > like his work to go through his branch, so the future of this particular
> > patch is a bit messy.
> >
> > Maybe we should just drop the related patches that caused the issue from
> > the mm-new branch?  That way we don't need a fix at all.
> >
> > And when Vlastimil is around, we can get him to pick up the set
> > including the fix.
> >
> > Doing things this way will allow Vlastimil the avoid conflicts on
> > rebase, and restore the userspace testing in mm-new.
> >
> > Does that make sense to everyone?
>
> Sounds good to me, I didn't realise that both the original series at [0])
> (which introduced the test fail) and the follow up at [1] were intended to
> be dropped, I thought only [1] but dropping [0] obviously also fixes it!
>
> And it looks like Andrew's done so and tests now fully working in mm-new
> again so I'm happy :)

OK this isn't the case.

Can you clarify that you want to drop [0] and explicitly reply there asking
Andrew to drop it just so all is certain?

Because right now VMA tests are still broken in mm-new :(

>
> Cheers, Lorenzo
>
> [0]:https://lore.kernel.org/all/20250718172138.103116-1-pfalcato@xxxxxxx/
> [1]:https://lore.kernel.org/all/20250812162124.59417-1-pfalcato@xxxxxxx/

Thanks, Lorenzo