linux-kernel - [PATCH] mm/gup: remove no longer used gup_fast_undo_dev

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Message-Id: <20251219-gup-cleanup-v1-1-348a70d9eecb@tencent.com>
Date: Fri, 19 Dec 2025 19:46:00 +0800
From: Kairui Song <ryncsn@...il.com>
To: linux-mm@...ck.org
Cc: Andrew Morton <akpm@...ux-foundation.org>, 
 David Hildenbrand <david@...nel.org>, Jason Gunthorpe <jgg@...pe.ca>, 
 John Hubbard <jhubbard@...dia.com>, Peter Xu <peterx@...hat.com>, 
 Alistair Popple <apopple@...dia.com>, linux-kernel@...r.kernel.org, 
 Kairui Song <kasong@...cent.com>
Subject: [PATCH] mm/gup: remove no longer used gup_fast_undo_dev_pagemap

From: Kairui Song <kasong@...cent.com>

This helper is no longer used after commit fd2825b0760a ("mm/gup: remove
pXX_devmap usage from get_user_pages()").

Signed-off-by: Kairui Song <kasong@...cent.com>
---
 mm/gup.c | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/mm/gup.c b/mm/gup.c
index 95d948c8e86c..8e7dc2c6ee73 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -2806,17 +2806,6 @@ static bool gup_fast_folio_allowed(struct folio *folio, unsigned int flags)
 	return !reject_file_backed || shmem_mapping(mapping);
 }
 
-static void __maybe_unused gup_fast_undo_dev_pagemap(int *nr, int nr_start,
-		unsigned int flags, struct page **pages)
-{
-	while ((*nr) - nr_start) {
-		struct folio *folio = page_folio(pages[--(*nr)]);
-
-		folio_clear_referenced(folio);
-		gup_put_folio(folio, 1, flags);
-	}
-}
-
 #ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
 /*
  * GUP-fast relies on pte change detection to avoid concurrent pgtable

---
base-commit: 67a1f192fe6d4c1ee84e296e7d518bb881d03c94
change-id: 20251219-gup-cleanup-8146b8884351

Best regards,
-- 
Kairui Song <kasong@...cent.com>