zsmalloc: use correct types in _first_obj_offset functions

Since commit ffedd09fa9b0 ("zsmalloc: Stop using slab fields in struct
page") we are using page->page_type (unsigned int) field instead of
page->units (int) as first object offset in a subpage of zspage.  So
get_first_obj_offset() and set_first_obj_offset() functions should work
with unsigned int type.

Link: https://lkml.kernel.org/r/20220909083722.85024-1-avromanov@sberdevices.ru
Fixes: ffedd09fa9b0 ("zsmalloc: Stop using slab fields in struct page")
Signed-off-by: Alexey Romanov <avromanov@sberdevices.ru>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Alexey Romanov <avromanov@sberdevices.ru>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 12eb11e709393544dd5c93bb6aaf2258ed45a96f..525758713a553d152084a0e3442e0f40fe132cf3 100644 (file)
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -472,12 +472,12 @@ static inline struct page *get_first_page(struct zspage *zspage)
        return first_page;
 }
 
-static inline int get_first_obj_offset(struct page *page)
+static inline unsigned int get_first_obj_offset(struct page *page)
 {
        return page->page_type;
 }
 
-static inline void set_first_obj_offset(struct page *page, int offset)
+static inline void set_first_obj_offset(struct page *page, unsigned int offset)
 {
        page->page_type = offset;
 }
@@ -1592,7 +1592,7 @@ static void zs_object_copy(struct size_class *class, unsigned long dst,
 static unsigned long find_alloced_obj(struct size_class *class,
                                        struct page *page, int *obj_idx)
 {
-       int offset = 0;
+       unsigned int offset;
        int index = *obj_idx;
        unsigned long handle = 0;
        void *addr = kmap_atomic(page);
@@ -1846,7 +1846,7 @@ static int zs_page_migrate(struct page *newpage, struct page *page,
        struct zspage *zspage;
        struct page *dummy;
        void *s_addr, *d_addr, *addr;
-       int offset;
+       unsigned int offset;
        unsigned long handle;
        unsigned long old_obj, new_obj;
        unsigned int obj_idx;