linux-kernel - Re: [PATCH] mm: Remove is_migrate

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Message-Id: <20250822180906.48005-1-sj@kernel.org>
Date: Fri, 22 Aug 2025 11:09:06 -0700
From: SeongJae Park <sj@...nel.org>
To: Brendan Jackman <jackmanb@...gle.com>
Cc: SeongJae Park <sj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...hat.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Mike Rapoport <rppt@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Zi Yan <ziy@...dia.com>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: Remove is_migrate_highatomic()

On Thu, 21 Aug 2025 13:29:47 +0000 Brendan Jackman <jackmanb@...gle.com> wrote:

> There are 3 potential reasons for is_migrate_*() helpers:
> 
> 1. They represent higher-level attributes of migratetypes, like
>    is_migrate_movable()
> 
> 2. They are ifdef'd, like is_migrate_isolate().
> 
> 3. For consistency with an is_migrate_*_page() helper, also like
>    is_migrate_isolate().
> 
> It looks like is_migrate_highatomic() was for case 3, but that was
> removed in commit e0932b6c1f94 ("mm: page_alloc: consolidate free page
> accounting").
> 
> So remove the indirection and go back to a simple comparison.
> 
> Signed-off-by: Brendan Jackman <jackmanb@...gle.com>

Acked-by: SeongJae Park <sj@...nel.org>


Thanks,
SJ

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