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

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Message-ID: <20250821163246.GA133370@cmpxchg.org>
Date: Thu, 21 Aug 2025 12:32:46 -0400
From: Johannes Weiner <hannes@...xchg.org>
To: Brendan Jackman <jackmanb@...gle.com>
Cc: 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>, Zi Yan <ziy@...dia.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: Remove is_migrate_highatomic()

On Thu, Aug 21, 2025 at 01:29:47PM +0000, Brendan Jackman 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>

Oops! Thanks.

Acked-by: Johannes Weiner <hannes@...xchg.org>