linux-kernel - Re: [PATCH v2 06/13] mm/gup: Drop folio_fast_pin

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Message-ID: <ZdXkpYEuRAxoLtHI@x1n>
Date: Wed, 21 Feb 2024 19:55:17 +0800
From: Peter Xu <peterx@...hat.com>
To: Jason Gunthorpe <jgg@...dia.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	James Houghton <jthoughton@...gle.com>,
	David Hildenbrand <david@...hat.com>,
	"Kirill A . Shutemov" <kirill@...temov.name>,
	Yang Shi <shy828301@...il.com>, linux-riscv@...ts.infradead.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Aneesh Kumar K . V" <aneesh.kumar@...nel.org>,
	Rik van Riel <riel@...riel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Axel Rasmussen <axelrasmussen@...gle.com>,
	Mike Rapoport <rppt@...nel.org>, John Hubbard <jhubbard@...dia.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Michael Ellerman <mpe@...erman.id.au>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Andrew Jones <andrew.jones@...ux.dev>,
	linuxppc-dev@...ts.ozlabs.org,
	Mike Kravetz <mike.kravetz@...cle.com>,
	Muchun Song <muchun.song@...ux.dev>,
	linux-arm-kernel@...ts.infradead.org,
	Christoph Hellwig <hch@...radead.org>,
	Lorenzo Stoakes <lstoakes@...il.com>,
	Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v2 06/13] mm/gup: Drop folio_fast_pin_allowed() in hugepd
 processing

On Mon, Jan 15, 2024 at 02:37:48PM -0400, Jason Gunthorpe wrote:
> > Drop that check, not only because it'll never be true for hugepd per any
> > known plan, but also it paves way for reusing the function outside
> > fast-gup.
> 
> I didn't see any other caller of this function in this series? When
> does this re-use happen??

It's reused in patch 12 ("mm/gup: Handle hugepd for follow_page()").

Thanks,

-- 
Peter Xu