linux-kernel - Re: [PATCH RFC 07/29] mm/migrate: rename isolate_movable_page() to isolate_movable_ops

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Message-ID: <aGJE3r5uSzRj8BsR@hyeyoo>
Date: Mon, 30 Jun 2025 17:04:01 +0900
From: Harry Yoo <harry.yoo@...cle.com>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-doc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
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        Qi Zheng <zhengqi.arch@...edance.com>,
        Shakeel Butt <shakeel.butt@...ux.dev>
Subject: Re: [PATCH RFC 07/29] mm/migrate: rename isolate_movable_page() to
 isolate_movable_ops_page()

On Wed, Jun 18, 2025 at 07:39:50PM +0200, David Hildenbrand wrote:
> ... and start moving back to per-page things that will absolutely not be
> folio things in the future. Add documentation and a comment that the
> remaining folio stuff (lock, refcount) will have to be reworked as well.
> 
> While at it, convert the VM_BUG_ON() into a WARN_ON_ONCE() and handle
> it gracefully (relevant with further changes), and convert a
> WARN_ON_ONCE() into a VM_WARN_ON_ONCE_PAGE().
> 
> Signed-off-by: David Hildenbrand <david@...hat.com>
> ---

Haha yeah, back to pages after folio conversion :P
But makes sense.

Reviewed-by: Harry Yoo <harry.yoo@...cle.com>

Side question: In the future, maybe we will be unable to tell whether
a page is compound or not, without first inspecting page->memdesc?
(e.g., struct slab could have an order and a pointer to the head page...
just imagining).

-- 
Cheers,
Harry / Hyeonggon