Re: [PATCHv3 1/2] mm/memory: Do not populate page table entries beyond i_size

[Matthew Wilcox]

On Wed, Oct 29, 2025 at 02:45:52AM -0700, Hugh Dickins wrote:
> But you're giving yourself too hard a time of backporting with your
> 5.10 Fixee 01c70267053d for 1/2: the only filesystem which set the
> flag then was tmpfs, which you're now excepting.  The flag got
> renamed later (in 5.16) and then in 5.17 at last there was another
> filesystem to set it.  So, this 1/2 would be
> 
> Fixes: 6795801366da ("xfs: Support large folios")

I haven't been able to keep up with this patchset -- sorry.

But this problem didn't exist until bs>PS support was added because we
would never add a folio to the page cache which extended beyond i_size
before.  We'd shrink the folio order allocated in do_page_cache_ra()
(actually, we still do, but page_cache_ra_unbounded() rounds it up
again).  So it doesn't fix that commit at all, but something far more
recent.