linux-kernel - Re: [PATCH] mm: Move nth_page from folio_page into folio

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Message-ID: <Z9LOzj17FDFDw7JM@casper.infradead.org>
Date: Thu, 13 Mar 2025 12:25:50 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Herbert Xu <herbert@...dor.apana.org.au>
Cc: linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@....de>, Zi Yan <ziy@...dia.com>,
	Eric Biggers <ebiggers@...nel.org>
Subject: Re: [PATCH] mm: Move nth_page from folio_page into folio_next

On Thu, Mar 13, 2025 at 12:40:34PM +0800, Herbert Xu wrote:
> Discontiguous memory may require the use of nth_page instead of adding
> to struct page arithmetically.  However, discontiguous memory cannot
> exist within a single folio.

That isn't true.  HugeTLB can construct a folio which crosses a
contiguity boundary.