Re: [PATCH] filemap: check for folio order < mapping min order

[Matthew Wilcox <willy@xxxxxxxxxxxxx>]

On Thu, Feb 20, 2025 at 03:40:33PM -0500, Kent Overstreet wrote:
> accidentally inserting a folio < mapping min order causes the readahead
> code to go into an infinite loop, which is unpleasant.

We already have:

        VM_BUG_ON_FOLIO(folio_order(folio) < mapping_min_folio_order(mapping),
                        folio);

If you're not enabling CONFIG_DEBUG_VM in your testing, I think that's
an oversight on your part.