[PATCH v3 03/15] mm/page_alloc: Export free_frozen_pages() instead of free_unref_page()

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

We already have the concept of "frozen pages" (eg page_ref_freeze()),
so let's not complicate things by also having the concept of "unref
pages".

Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 mm/internal.h        |  2 +-
 mm/page_alloc.c      | 18 +++++++++---------
 mm/page_frag_cache.c |  6 +++---
 mm/swap.c            |  2 +-
 4 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/mm/internal.h b/mm/internal.h
index cb8d8e8e3ffa..ca400c70199c 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -741,7 +741,7 @@ extern bool free_pages_prepare(struct page *page, unsigned int order);
 
 extern int user_min_free_kbytes;
 
-void free_unref_page(struct page *page, unsigned int order);
+void free_frozen_pages(struct page *page, unsigned int order);
 void free_unref_folios(struct folio_batch *fbatch);
 
 extern void zone_pcp_reset(struct zone *zone);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c40a0c29a89c..adac485e3254 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2626,9 +2626,9 @@ static int nr_pcp_high(struct per_cpu_pages *pcp, struct zone *zone,
 	return high;
 }
 
-static void free_unref_page_commit(struct zone *zone, struct per_cpu_pages *pcp,
-				   struct page *page, int migratetype,
-				   unsigned int order)
+static void free_frozen_page_commit(struct zone *zone,
+		struct per_cpu_pages *pcp, struct page *page, int migratetype,
+		unsigned int order)
 {
 	int high, batch;
 	int pindex;
@@ -2677,7 +2677,7 @@ static void free_unref_page_commit(struct zone *zone, struct per_cpu_pages *pcp,
 /*
  * Free a pcp page
  */
-void free_unref_page(struct page *page, unsigned int order)
+void free_frozen_pages(struct page *page, unsigned int order)
 {
 	unsigned long __maybe_unused UP_flags;
 	struct per_cpu_pages *pcp;
@@ -2713,7 +2713,7 @@ void free_unref_page(struct page *page, unsigned int order)
 	pcp_trylock_prepare(UP_flags);
 	pcp = pcp_spin_trylock(zone->per_cpu_pageset);
 	if (pcp) {
-		free_unref_page_commit(zone, pcp, page, migratetype, order);
+		free_frozen_page_commit(zone, pcp, page, migratetype, order);
 		pcp_spin_unlock(pcp);
 	} else {
 		free_one_page(zone, page, pfn, order, FPI_NONE);
@@ -2777,7 +2777,7 @@ void free_unref_folios(struct folio_batch *folios)
 
 			/*
 			 * Free isolated pages directly to the
-			 * allocator, see comment in free_unref_page.
+			 * allocator, see comment in free_frozen_pages.
 			 */
 			if (is_migrate_isolate(migratetype)) {
 				free_one_page(zone, &folio->page, pfn,
@@ -2808,7 +2808,7 @@ void free_unref_folios(struct folio_batch *folios)
 			migratetype = MIGRATE_MOVABLE;
 
 		trace_mm_page_free_batched(&folio->page);
-		free_unref_page_commit(zone, pcp, &folio->page, migratetype,
+		free_frozen_page_commit(zone, pcp, &folio->page, migratetype,
 				order);
 	}
 
@@ -4871,11 +4871,11 @@ void __free_pages(struct page *page, unsigned int order)
 	struct alloc_tag *tag = pgalloc_tag_get(page);
 
 	if (put_page_testzero(page))
-		free_unref_page(page, order);
+		free_frozen_pages(page, order);
 	else if (!head) {
 		pgalloc_tag_sub_pages(tag, (1 << order) - 1);
 		while (order-- > 0)
-			free_unref_page(page + (1 << order), order);
+			free_frozen_pages(page + (1 << order), order);
 	}
 }
 EXPORT_SYMBOL(__free_pages);
diff --git a/mm/page_frag_cache.c b/mm/page_frag_cache.c
index 3f7a203d35c6..d2423f30577e 100644
--- a/mm/page_frag_cache.c
+++ b/mm/page_frag_cache.c
@@ -86,7 +86,7 @@ void __page_frag_cache_drain(struct page *page, unsigned int count)
 	VM_BUG_ON_PAGE(page_ref_count(page) == 0, page);
 
 	if (page_ref_sub_and_test(page, count))
-		free_unref_page(page, compound_order(page));
+		free_frozen_pages(page, compound_order(page));
 }
 EXPORT_SYMBOL(__page_frag_cache_drain);
 
@@ -138,7 +138,7 @@ void *__page_frag_alloc_align(struct page_frag_cache *nc,
 			goto refill;
 
 		if (unlikely(encoded_page_decode_pfmemalloc(encoded_page))) {
-			free_unref_page(page,
+			free_frozen_pages(page,
 					encoded_page_decode_order(encoded_page));
 			goto refill;
 		}
@@ -166,6 +166,6 @@ void page_frag_free(void *addr)
 	struct page *page = virt_to_head_page(addr);
 
 	if (unlikely(put_page_testzero(page)))
-		free_unref_page(page, compound_order(page));
+		free_frozen_pages(page, compound_order(page));
 }
 EXPORT_SYMBOL(page_frag_free);
diff --git a/mm/swap.c b/mm/swap.c
index 10decd9dffa1..3a01acfd5a89 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -109,7 +109,7 @@ void __folio_put(struct folio *folio)
 	page_cache_release(folio);
 	folio_unqueue_deferred_split(folio);
 	mem_cgroup_uncharge(folio);
-	free_unref_page(&folio->page, folio_order(folio));
+	free_frozen_pages(&folio->page, folio_order(folio));
 }
 EXPORT_SYMBOL(__folio_put);
 
-- 
2.45.2