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From:   Hyeonggon Yoo <42.hyeyoo@gmail.com>
To:     Minchan Kim <minchan@kernel.org>,
        Sergey Senozhatsky <senozhatsky@chromium.org>
Cc:     Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, Matthew Wilcox <willy@infradead.org>,
        Mike Rapoport <rppt@kernel.org>,
        Hyeonggon Yoo <42.hyeyoo@gmail.com>
Subject: [RFC PATCH v2 10/21] mm/zsmalloc: convert obj_allocated() and related helpers to use zsdesc
Date:   Thu, 13 Jul 2023 13:20:25 +0900
Message-ID: <20230713042037.980211-11-42.hyeyoo@gmail.com>
In-Reply-To: <20230713042037.980211-1-42.hyeyoo@gmail.com>
References: <20230713042037.980211-1-42.hyeyoo@gmail.com>
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Convert obj_allocated(), 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@gmail.com>
---
 mm/zsmalloc.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 48bfdbbe3b1e..efd7a0f78962 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -942,15 +942,15 @@ static unsigned long handle_to_obj(unsigned long handle)
 	return *(unsigned long *)handle;
 }
 
-static inline bool obj_allocated(struct page *page, void *obj,
+static inline bool obj_allocated(struct zsdesc *zsdesc, void *obj,
 				 unsigned long *phandle)
 {
 	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;
 
@@ -1698,18 +1698,18 @@ static void zs_object_copy(struct size_class *class, unsigned long dst,
  * return handle.
  */
 static unsigned long find_alloced_obj(struct size_class *class,
-				      struct page *page, int *obj_idx)
+				      struct zsdesc *zsdesc, int *obj_idx)
 {
 	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_allocated(page, addr + offset, &handle))
+		if (obj_allocated(zsdesc, addr + offset, &handle))
 			break;
 
 		offset += class->size;
@@ -1733,7 +1733,7 @@ static void migrate_zspage(struct zs_pool *pool, struct zspage *src_zspage,
 	struct size_class *class = pool->size_class[src_zspage->class];
 
 	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)
@@ -1990,7 +1990,7 @@ 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);
-- 
2.41.0