hugetlb: kill hugetlbfs_pagecache_page()

Fold hugetlbfs_pagecache_page() into its sole caller to remove some
duplicated code. No functional change intended.

Link: https://lkml.kernel.org/r/20220901120030.63318-8-linmiaohe@huawei.comSigned-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/hugetlb.c

@@ -5433,19 +5433,6 @@ static vm_fault_t hugetlb_wp(struct mm_struct *mm, struct vm_area_struct *vma,
 	return ret;
 }
 
-/* Return the pagecache page at a given address within a VMA */
-static struct page *hugetlbfs_pagecache_page(struct hstate *h,
-			struct vm_area_struct *vma, unsigned long address)
-{
-	struct address_space *mapping;
-	pgoff_t idx;
-
-	mapping = vma->vm_file->f_mapping;
-	idx = vma_hugecache_offset(h, vma, address);
-
-	return find_lock_page(mapping, idx);
-}
-
 /*
  * Return whether there is a pagecache page to back given address within VMA.
  * Caller follow_hugetlb_page() holds page_table_lock so we cannot lock_page.
@@ -5840,7 +5827,7 @@ vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
 		/* Just decrements count, does not deallocate */
 		vma_end_reservation(h, vma, haddr);
 
-		pagecache_page = hugetlbfs_pagecache_page(h, vma, haddr);
+		pagecache_page = find_lock_page(mapping, idx);
 	}
 
 	ptl = huge_pte_lock(h, mm, ptep);