+ zsmalloc-use-correct-types-in-_first_obj_offset-functions.patch added to mm-unstable branch

+ zsmalloc-use-correct-types-in-_first_obj_offset-functions.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: zsmalloc: use correct types in _first_obj_offset functions
has been added to the -mm mm-unstable branch.  Its filename is
     zsmalloc-use-correct-types-in-_first_obj_offset-functions.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/zsmalloc-use-correct-types-in-_first_obj_offset-functions.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Alexey Romanov <avromanov@sberdevices.ru>
Subject: zsmalloc: use correct types in _first_obj_offset functions
Date: Fri, 9 Sep 2022 11:37:22 +0300

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>
---

 mm/zsmalloc.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/mm/zsmalloc.c~zsmalloc-use-correct-types-in-_first_obj_offset-functions
+++ a/mm/zsmalloc.c
@@ -472,12 +472,12 @@ static inline struct page *get_first_pag
 	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_c
 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 *
 	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;
_

Patches currently in -mm which might be from avromanov@sberdevices.ru are

zsmalloc-zs_object_copy-add-clarifying-comment.patch
zsmalloc-remove-unnecessary-size_class-null-check.patch
zsmalloc-zs_object_copy-replace-email-link-to-doc.patch
zram-dont-retry-compress-incompressible-page.patch
zsmalloc-use-correct-types-in-_first_obj_offset-functions.patch