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Date: Thu, 16 Jul 2026 17:48:11 +0100
From: Matthew Wilcox <willy@infradead.org>
To: Brendan Jackman <jackmanb@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
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Subject: Re: [PATCH 1/3] mm: move internal mempolicy APIs to new internal
 header
Message-ID: <alkLSzQvzT9zJbY1@casper.infradead.org>
References: <20260716-folio-alloc-cleanups-v1-0-5363b8e92d33@google.com>
 <20260716-folio-alloc-cleanups-v1-1-5363b8e92d33@google.com>
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In-Reply-To: <20260716-folio-alloc-cleanups-v1-1-5363b8e92d33@google.com>

On Thu, Jul 16, 2026 at 02:30:10PM +0000, Brendan Jackman wrote:
> There are no external users for this surface, reduce the scope.
> -struct folio *folio_alloc_mpol_noprof(gfp_t gfp, unsigned int order,
> -		struct mempolicy *mpol, pgoff_t ilx, int nid);

Hm.  So what we're saying is that allocations which respect mempolicy are
only for core mm and not for, eg, device drivers to do.  Is that really
what we want to say?  I don't think so, because that's inconsistent
with having just widened __filemap_get_folio_mpol to allow guest_memfd
to specify a mempolicy.