Re: [PATCH 11/12] mm: make userland page table freeing RCU-safe

[Lorenzo Stoakes (ARM)]

On Tue, Sep 01, 2026 at 02:33:14PM +0100, Kiryl Shutsemau wrote:
> On Tue, Sep 01, 2026 at 12:01:31PM +0100, Lorenzo Stoakes (ARM) wrote:
> > With this change in place the kernel policy is now that all page tables are
>
> s/all/userspace/ as subject implies?

Right yeah :) I hoped that the summary line would clarify that but can edit that
also.

>
> BTW, what is your take on kernel page tables? Do we want the same policy
> there. pagetable_free_kernel() is not RCU-safe as it is.

Yeah I think so too. I may follow up with a series to that effect also!

>
> > freed after an RCU grace period, and thus it is now safe to unconditionally
> > perform page table walks under RCU, safe in the knowledge that page tables
> > will not be freed underneath the walker.
>
> --
>   Kiryl Shutsemau / Kirill A. Shutemov

--
Cheers, Lorenzo