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.

Link: https://lkml.kernel.org/r/20250929104643.1100421-1-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: Alistair Popple <apopple@nvidia.com>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 71ac78b9f834f6fe00168ad9d1a71c8f4ab00c70..fee4cf7fa30073c0e9351846bb33c90907b9d53b 100644 (file)
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -682,12 +682,6 @@ 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;