hugetlb: rename remove_huge_page to hugetlb_delete_from_page_cache

[ Upstream commit 7e1813d ]

remove_huge_page removes a hugetlb page from the page cache.  Change to
hugetlb_delete_from_page_cache as it is a more descriptive name.
huge_add_to_page_cache is global in scope, but only deals with hugetlb
pages.  For consistency and clarity, rename to hugetlb_add_to_page_cache.

Link: https://lkml.kernel.org/r/20220914221810.95771-4-mike.kravetz@oracle.com
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: James Houghton <jthoughton@google.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Prakash Sangappa <prakash.sangappa@oracle.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Stable-dep-of: 8625147 ("hugetlbfs: don't delete error page from pagecache")
Signed-off-by: Sasha Levin <sashal@kernel.org>

fs/hugetlbfs/inode.c

@@ -364,7 +364,7 @@ static int hugetlbfs_write_end(struct file *file, struct address_space *mapping,
 	return -EINVAL;
 }
 
-static void remove_huge_page(struct page *page)
+static void hugetlb_delete_from_page_cache(struct page *page)
 {
 	ClearPageDirty(page);
 	ClearPageUptodate(page);
@@ -487,15 +487,14 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart,
 			folio_lock(folio);
 			/*
 			 * We must free the huge page and remove from page
-			 * cache (remove_huge_page) BEFORE removing the
-			 * region/reserve map (hugetlb_unreserve_pages).  In
-			 * rare out of memory conditions, removal of the
-			 * region/reserve map could fail. Correspondingly,
-			 * the subpool and global reserve usage count can need
-			 * to be adjusted.
+			 * cache BEFORE removing the region/reserve map
+			 * (hugetlb_unreserve_pages).  In rare out of memory
+			 * conditions, removal of the region/reserve map could
+			 * fail. Correspondingly, the subpool and global
+			 * reserve usage count can need to be adjusted.
 			 */
 			VM_BUG_ON(HPageRestoreReserve(&folio->page));
-			remove_huge_page(&folio->page);
+			hugetlb_delete_from_page_cache(&folio->page);
 			freed++;
 			if (!truncate_op) {
 				if (unlikely(hugetlb_unreserve_pages(inode,
@@ -737,7 +736,7 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
 		}
 		clear_huge_page(page, addr, pages_per_huge_page(h));
 		__SetPageUptodate(page);
-		error = huge_add_to_page_cache(page, mapping, index);
+		error = hugetlb_add_to_page_cache(page, mapping, index);
 		if (unlikely(error)) {
 			restore_reserve_on_error(h, &pseudo_vma, addr, page);
 			put_page(page);
@@ -749,7 +748,7 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
 
 		SetHPageMigratable(page);
 		/*
-		 * unlock_page because locked by huge_add_to_page_cache()
+		 * unlock_page because locked by hugetlb_add_to_page_cache()
 		 * put_page() due to reference from alloc_huge_page()
 		 */
 		unlock_page(page);
@@ -994,7 +993,7 @@ static int hugetlbfs_error_remove_page(struct address_space *mapping,
 	struct inode *inode = mapping->host;
 	pgoff_t index = page->index;
 
-	remove_huge_page(page);
+	hugetlb_delete_from_page_cache(page);
 	if (unlikely(hugetlb_unreserve_pages(inode, index, index + 1, 1)))
 		hugetlb_fix_reserve_counts(inode);
 

include/linux/hugetlb.h

@@ -665,7 +665,7 @@ struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
 				nodemask_t *nmask, gfp_t gfp_mask);
 struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
 				unsigned long address);
-int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
+int hugetlb_add_to_page_cache(struct page *page, struct address_space *mapping,
 			pgoff_t idx);
 void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
 				unsigned long address, struct page *page);

mm/hugetlb.c

@@ -5445,7 +5445,7 @@ static bool hugetlbfs_pagecache_present(struct hstate *h,
 	return page != NULL;
 }
 
-int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
+int hugetlb_add_to_page_cache(struct page *page, struct address_space *mapping,
 			   pgoff_t idx)
 {
 	struct folio *folio = page_folio(page);
@@ -5583,7 +5583,7 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
 		new_page = true;
 
 		if (vma->vm_flags & VM_MAYSHARE) {
-			int err = huge_add_to_page_cache(page, mapping, idx);
+			int err = hugetlb_add_to_page_cache(page, mapping, idx);
 			if (err) {
 				put_page(page);
 				if (err == -EEXIST)
@@ -6008,11 +6008,11 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
 
 		/*
 		 * Serialization between remove_inode_hugepages() and
-		 * huge_add_to_page_cache() below happens through the
+		 * hugetlb_add_to_page_cache() below happens through the
 		 * hugetlb_fault_mutex_table that here must be hold by
 		 * the caller.
 		 */
-		ret = huge_add_to_page_cache(page, mapping, idx);
+		ret = hugetlb_add_to_page_cache(page, mapping, idx);
 		if (ret)
 			goto out_release_nounlock;
 		page_in_pagecache = true;