Re: [PATCH v4 00/12] mm: make userland page table freeing RCU-safe

On 9/23/26 11:15, David Hildenbrand (Arm) wrote:

On 9/23/26 11:04, Lorenzo Stoakes (ARM) wrote:

quoted

On Wed, Sep 23, 2026 at 10:45:33AM +0200, David Hildenbrand (Arm) wrote:

quoted

On 9/23/26 01:00, Andrew Morton wrote:

quoted

Do we have reason to believe that anyone is seeing any effects from
their arch's failure to rcu-free the page tables?

This sounds like a rather long-standing wart, yes?

The patchset is thinly reviewed and mm.git is bursting at the seams
again.  I'll play wait-and-see on this series.

Do we want to nudge arch maintainers to review?

(Just to note that I replied separately, 'thinly reviewed' is incorrect, it's
been in -next for weeks and the whole thing was reviewed by Kiryl.)

Ack.

quoted

The only places where that would be useful is m68k motorola, sparc32.

But in any case it has been heavily tested including on every single arch
listed with stress testing performed (I think I cover that in the cover
letter).

The changes are not controversial so I don't think that's a blocker, but
it'd be nice?

I doubt we'll ever get sparc32 reviews :)

I'd definitely appreciate some review on the arch bits from arch maintainers,
but if they don't reply within the next weeks I wouldn't wait on that.

Indeed, for minor arches like this the lack of review (it would be a whole
cycle by the merge window) shouldn't be a blocker for important tree-wide
progress.