Re: [PATCH v4 16/21] mm/mm_init: simplify deferred_free_pages() migratetype init

[Mike Rapoport]

On Sat, Jul 25, 2026 at 07:21:16PM +0200, Pratyush Yadav wrote:
> From: Muchun Song <songmuchun@xxxxxxxxxxxxx>
> 
> deferred_free_pages() open-codes two loops to initialize the pageblock
> migratetype for a range of pages.
> 
> Replace them with pageblock_migratetype_init_range() to remove the
> duplication and make the code clearer (Note that deferred_free_pages() may
> be called from atomic context).
> 
> Link: https://lore.kernel.org/20260612035903.2468601-6-songmuchun@xxxxxxxxxxxxx
> Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
> Acked-by: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
> Acked-by: Oscar Salvador <osalvador@xxxxxxx>
> Signed-off-by: Pratyush Yadav (Google) <pratyush@xxxxxxxxxx>
> ---
> 
> Notes:
>     This patch is taken from Muchun's series [0]. The patch as of today is
>     in mm-unstable.

@Andrew,

It looks like it'll take some time for this patch to get into mm-stable so
we can't base this work on a branch in the mm tree :(

I'd like to expose the KHO scratch extension to linux-next ASAP so I'm
inclined to take this patch as a part of this series and live for a while
with a duplicated commit in linux-next. Once this patch would be in
mm-stable we can rebase kho-scratch work on top of mm-stable and hopefully
there will be enough time for it to live in linux-next so that Linus won't
get angry at us :) 

How does that sound to you?
     
>     [0] https://lore.kernel.org/linux-mm/20260612035903.2468601-6-songmuchun@xxxxxxxxxxxxx/
> 
>  mm/mm_init.c | 19 ++++++++-----------
>  1 file changed, 8 insertions(+), 11 deletions(-)

-- 
Sincerely yours,
Mike.