linux-kernel - [RFC PATCH 1/5] io_uring: allocate folio in io_mem_alloc

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Message-ID: <20260130034818.472804-2-ziy@nvidia.com>
Date: Thu, 29 Jan 2026 22:48:14 -0500
From: Zi Yan <ziy@...dia.com>
To: Jason Gunthorpe <jgg@...dia.com>,
	David Hildenbrand <david@...nel.org>,
	Matthew Wilcox <willy@...radead.org>
Cc: Alistair Popple <apopple@...dia.com>,
	Balbir Singh <balbirs@...dia.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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>,
	Jens Axboe <axboe@...nel.dk>,
	Zi Yan <ziy@...dia.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	Nico Pache <npache@...hat.com>,
	Ryan Roberts <ryan.roberts@....com>,
	Dev Jain <dev.jain@....com>,
	Barry Song <baohua@...nel.org>,
	Lance Yang <lance.yang@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>,
	Oscar Salvador <osalvador@...e.de>,
	Brendan Jackman <jackmanb@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	io-uring@...r.kernel.org
Subject: [RFC PATCH 1/5] io_uring: allocate folio in io_mem_alloc_compound() and function rename

The page allocated in io_mem_alloc_compound() is actually used as a folio
later in io_region_mmap(). So allocate a folio instead of a compound page
and rename io_mem_alloc_compound() to io_mem_alloc_folio().

This prepares for code separation of compound page and folio in a follow-up
commit.

Signed-off-by: Zi Yan <ziy@...dia.com>
---
 io_uring/memmap.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/io_uring/memmap.c b/io_uring/memmap.c
index 7d3c5eb58480..8ed8a78d71cc 100644
--- a/io_uring/memmap.c
+++ b/io_uring/memmap.c
@@ -15,10 +15,10 @@
 #include "rsrc.h"
 #include "zcrx.h"
 
-static bool io_mem_alloc_compound(struct page **pages, int nr_pages,
+static bool io_mem_alloc_folio(struct page **pages, int nr_pages,
 				  size_t size, gfp_t gfp)
 {
-	struct page *page;
+	struct folio *folio;
 	int i, order;
 
 	order = get_order(size);
@@ -27,12 +27,12 @@ static bool io_mem_alloc_compound(struct page **pages, int nr_pages,
 	else if (order)
 		gfp |= __GFP_COMP;
 
-	page = alloc_pages(gfp, order);
-	if (!page)
+	folio = folio_alloc(gfp, order);
+	if (!folio)
 		return false;
 
 	for (i = 0; i < nr_pages; i++)
-		pages[i] = page + i;
+		pages[i] = folio_page(folio, i);
 
 	return true;
 }
@@ -162,7 +162,7 @@ static int io_region_allocate_pages(struct io_mapped_region *mr,
 	if (!pages)
 		return -ENOMEM;
 
-	if (io_mem_alloc_compound(pages, mr->nr_pages, size, gfp)) {
+	if (io_mem_alloc_folio(pages, mr->nr_pages, size, gfp)) {
 		mr->flags |= IO_REGION_F_SINGLE_REF;
 		goto done;
 	}
-- 
2.51.0