linux-kernel - [PATCH] mm/thp: Drop follow_devmap

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Message-Id: <20250929104643.1100421-1-anshuman.khandual@arm.com>
Date: Mon, 29 Sep 2025 11:46:43 +0100
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-mm@...ck.org
Cc: Anshuman Khandual <anshuman.khandual@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...hat.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Zi Yan <ziy@...dia.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] mm/thp: Drop follow_devmap_pmd() default stub

follow_devmap_pmd() has already been dropped by the commit fd2825b0760a
("mm/gup: remove pXX_devmap usage from get_user_pages()"). The fallback
stub in the header which is now redundant, can be dropped off as well.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: David Hildenbrand <david@...hat.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Zi Yan <ziy@...dia.com>
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 include/linux/huge_mm.h | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 7748489fde1b..96ce0ca54e49 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -652,12 +652,6 @@ static inline void mm_put_huge_zero_folio(struct mm_struct *mm)
 	return;
 }
 
-static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
-	unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap)
-{
-	return NULL;
-}
-
 static inline bool thp_migration_supported(void)
 {
 	return false;
-- 
2.30.2