[RFC PATCH 10/25] mm/zsmalloc: convert obj_tagged() and related helpers to use zsdesc

[Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>]

Convert obj_tagged(), and related helpers to take zsdesc. Also make
its callers to cast (struct page *) to (struct zsdesc *) when calling them.
The users will be converted gradually as there are many.

Signed-off-by: Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>
---
 mm/zsmalloc.c | 46 +++++++++++++++++++++++-----------------------
 1 file changed, 23 insertions(+), 23 deletions(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index c65bdce987e9..e1262c0a5ad4 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1047,15 +1047,15 @@ static unsigned long handle_to_obj(unsigned long handle)
 	return *(unsigned long *)handle;
 }
 
-static bool obj_tagged(struct page *page, void *obj, unsigned long *phandle,
+static bool obj_tagged(struct zsdesc *zsdesc, void *obj, unsigned long *phandle,
 		int tag)
 {
 	unsigned long handle;
-	struct zspage *zspage = get_zspage(page);
+	struct zspage *zspage = get_zspage(zsdesc_page(zsdesc));
 
 	if (unlikely(ZsHugePage(zspage))) {
-		VM_BUG_ON_PAGE(!is_first_page(page), page);
-		handle = page->index;
+		VM_BUG_ON_PAGE(!is_first_zsdesc(zsdesc), zsdesc_page(zsdesc));
+		handle = zsdesc->handle;
 	} else
 		handle = *(unsigned long *)obj;
 
@@ -1067,16 +1067,16 @@ static bool obj_tagged(struct page *page, void *obj, unsigned long *phandle,
 	return true;
 }
 
-static inline bool obj_allocated(struct page *page, void *obj, unsigned long *phandle)
+static inline bool obj_allocated(struct zsdesc *zsdesc, void *obj, unsigned long *phandle)
 {
-	return obj_tagged(page, obj, phandle, OBJ_ALLOCATED_TAG);
+	return obj_tagged(zsdesc, obj, phandle, OBJ_ALLOCATED_TAG);
 }
 
 #ifdef CONFIG_ZPOOL
-static bool obj_stores_deferred_handle(struct page *page, void *obj,
+static bool obj_stores_deferred_handle(struct zsdesc *zsdesc, void *obj,
 		unsigned long *phandle)
 {
-	return obj_tagged(page, obj, phandle, OBJ_DEFERRED_HANDLE_TAG);
+	return obj_tagged(zsdesc, obj, phandle, OBJ_DEFERRED_HANDLE_TAG);
 }
 #endif
 
@@ -1112,7 +1112,7 @@ static int trylock_zspage(struct zspage *zspage)
 
 #ifdef CONFIG_ZPOOL
 static unsigned long find_deferred_handle_obj(struct size_class *class,
-		struct page *page, int *obj_idx);
+		struct zsdesc *zsdesc, int *obj_idx);
 
 /*
  * Free all the deferred handles whose objects are freed in zs_free.
@@ -1125,7 +1125,7 @@ static void free_handles(struct zs_pool *pool, struct size_class *class,
 	unsigned long handle;
 
 	while (1) {
-		handle = find_deferred_handle_obj(class, page, &obj_idx);
+		handle = find_deferred_handle_obj(class, page_zsdesc(page), &obj_idx);
 		if (!handle) {
 			page = get_next_page(page);
 			if (!page)
@@ -1906,18 +1906,18 @@ static void zs_object_copy(struct size_class *class, unsigned long dst,
  * return handle.
  */
 static unsigned long find_tagged_obj(struct size_class *class,
-					struct page *page, int *obj_idx, int tag)
+					struct zsdesc *zsdesc, int *obj_idx, int tag)
 {
 	unsigned int offset;
 	int index = *obj_idx;
 	unsigned long handle = 0;
-	void *addr = kmap_atomic(page);
+	void *addr = zsdesc_kmap_atomic(zsdesc);
 
-	offset = get_first_obj_offset(page);
+	offset = get_first_obj_offset(zsdesc_page(zsdesc));
 	offset += class->size * index;
 
 	while (offset < PAGE_SIZE) {
-		if (obj_tagged(page, addr + offset, &handle, tag))
+		if (obj_tagged(zsdesc, addr + offset, &handle, tag))
 			break;
 
 		offset += class->size;
@@ -1936,9 +1936,9 @@ static unsigned long find_tagged_obj(struct size_class *class,
  * return handle.
  */
 static unsigned long find_alloced_obj(struct size_class *class,
-					struct page *page, int *obj_idx)
+					struct zsdesc *zsdesc, int *obj_idx)
 {
-	return find_tagged_obj(class, page, obj_idx, OBJ_ALLOCATED_TAG);
+	return find_tagged_obj(class, zsdesc, obj_idx, OBJ_ALLOCATED_TAG);
 }
 
 #ifdef CONFIG_ZPOOL
@@ -1947,9 +1947,9 @@ static unsigned long find_alloced_obj(struct size_class *class,
  * and return handle.
  */
 static unsigned long find_deferred_handle_obj(struct size_class *class,
-		struct page *page, int *obj_idx)
+		struct zsdesc *zsdesc, int *obj_idx)
 {
-	return find_tagged_obj(class, page, obj_idx, OBJ_DEFERRED_HANDLE_TAG);
+	return find_tagged_obj(class, zsdesc, obj_idx, OBJ_DEFERRED_HANDLE_TAG);
 }
 #endif
 
@@ -1975,7 +1975,7 @@ static int migrate_zspage(struct zs_pool *pool, struct size_class *class,
 	int ret = 0;
 
 	while (1) {
-		handle = find_alloced_obj(class, s_page, &obj_idx);
+		handle = find_alloced_obj(class, page_zsdesc(s_page), &obj_idx);
 		if (!handle) {
 			s_page = get_next_page(s_page);
 			if (!s_page)
@@ -2243,7 +2243,7 @@ static int zs_page_migrate(struct page *newpage, struct page *page,
 
 	for (addr = s_addr + offset; addr < s_addr + PAGE_SIZE;
 					addr += class->size) {
-		if (obj_allocated(page, addr, &handle)) {
+		if (obj_allocated(page_zsdesc(page), addr, &handle)) {
 
 			old_obj = handle_to_obj(handle);
 			obj_to_location(old_obj, &dummy, &obj_idx);
@@ -2727,14 +2727,14 @@ static void restore_freelist(struct zs_pool *pool, struct size_class *class,
 			void *obj_addr = vaddr + off;
 
 			/* skip allocated object */
-			if (obj_allocated(page, obj_addr, &handle)) {
+			if (obj_allocated(page_zsdesc(page), obj_addr, &handle)) {
 				obj_idx++;
 				off += class->size;
 				continue;
 			}
 
 			/* free deferred handle from reclaim attempt */
-			if (obj_stores_deferred_handle(page, obj_addr, &handle))
+			if (obj_stores_deferred_handle(page_zsdesc(page), obj_addr, &handle))
 				cache_free_handle(pool, handle);
 
 			if (prev_free)
@@ -2830,7 +2830,7 @@ static int zs_reclaim_page(struct zs_pool *pool, unsigned int retries)
 		obj_idx = 0;
 		page = get_first_page(zspage);
 		while (1) {
-			handle = find_alloced_obj(class, page, &obj_idx);
+			handle = find_alloced_obj(class, page_zsdesc(page), &obj_idx);
 			if (!handle) {
 				page = get_next_page(page);
 				if (!page)
-- 
2.25.1