[PATCH] mm: Support order-1 folios in the page cache

[Pankaj Raghav <p.raghav@samsung.com>]

> Folios of order 1 have no space to store the deferred list.  This is
> not a problem for the page cache as file-backed folios are never
> placed on the deferred list.  All we need to do is prevent the core
> MM from touching the deferred list for order 1 folios and remove the
> code which prevented us from allocating order 1 folios.
>
> Link: https://lore.kernel.org/linux-mm/90344ea7-4eec-47ee-5996-0c22f42d6a6a@google.com/
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>

This is something I was looking forward to while developing the LBS support for XFS.

As I am preparing the next version of LBS patches for XFS, I could add this patch on top
and start running fstest for 8k block size on a system with 4k page size. I will let you
know if something blows up.

I haven't seen any new version of this series, so I will use this patch as a starting point
to test 8k filesystem blocksize.

-- 
Regards,
Pankaj