+ zsmalloc-introduce-sg-list-based-object-read-api-fix.patch added to mm-unstable branch

+ zsmalloc-introduce-sg-list-based-object-read-api-fix.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: zsmalloc: fixup zsmalloc-introduce-sg-list-based-object-read-api.patch
has been added to the -mm mm-unstable branch.  Its filename is
     zsmalloc-introduce-sg-list-based-object-read-api-fix.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/zsmalloc-introduce-sg-list-based-object-read-api-fix.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: Sergey Senozhatsky <senozhatsky@chromium.org>
Subject: zsmalloc: fixup zsmalloc-introduce-sg-list-based-object-read-api.patch
Date: Sat, 17 Jan 2026 11:48:40 +0900

zs_obj_read_sg_begin() always returns 0, convert it to void (per Yosry).

Link: https://lkml.kernel.org/r/20260117024900.792237-1-senozhatsky@chromium.org
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Brian Geffon <bgeffon@google.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Yosry Ahmed <yosry.ahmed@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/zsmalloc.h |    4 ++--
 mm/zsmalloc.c            |    6 ++----
 2 files changed, 4 insertions(+), 6 deletions(-)

--- a/include/linux/zsmalloc.h~zsmalloc-introduce-sg-list-based-object-read-api-fix
+++ a/include/linux/zsmalloc.h
@@ -44,8 +44,8 @@ void *zs_obj_read_begin(struct zs_pool *
 			size_t mem_len, void *local_copy);
 void zs_obj_read_end(struct zs_pool *pool, unsigned long handle,
 		     size_t mem_len, void *handle_mem);
-int zs_obj_read_sg_begin(struct zs_pool *pool, unsigned long handle,
-		   struct scatterlist *sg, size_t mem_len);
+void zs_obj_read_sg_begin(struct zs_pool *pool, unsigned long handle,
+			  struct scatterlist *sg, size_t mem_len);
 void zs_obj_read_sg_end(struct zs_pool *pool, unsigned long handle);
 void zs_obj_write(struct zs_pool *pool, unsigned long handle,
 		  void *handle_mem, size_t mem_len);
--- a/mm/zsmalloc.c~zsmalloc-introduce-sg-list-based-object-read-api-fix
+++ a/mm/zsmalloc.c
@@ -1142,8 +1142,8 @@ void zs_obj_read_end(struct zs_pool *poo
 }
 EXPORT_SYMBOL_GPL(zs_obj_read_end);
 
-int zs_obj_read_sg_begin(struct zs_pool *pool, unsigned long handle,
-			 struct scatterlist *sg, size_t mem_len)
+void zs_obj_read_sg_begin(struct zs_pool *pool, unsigned long handle,
+			  struct scatterlist *sg, size_t mem_len)
 {
 	struct zspage *zspage;
 	struct zpdesc *zpdesc;
@@ -1186,8 +1186,6 @@ int zs_obj_read_sg_begin(struct zs_pool
 
 		sg_set_page(sg, zpdesc_page(zpdesc), sizes[1], 0);
 	}
-
-	return 0;
 }
 EXPORT_SYMBOL_GPL(zs_obj_read_sg_begin);
 
_

Patches currently in -mm which might be from senozhatsky@chromium.org are

zram-document-writeback_batch_size.patch
zram-move-bd_stat-to-writeback-section.patch
zram-rename-zram_free_page.patch
zram-switch-to-guard-for-init_lock.patch
zram-consolidate-device-attr-declarations.patch
zram-use-u32-for-entry-ac_time-tracking.patch
zram-rename-internal-slot-api.patch
zram-rename-internal-slot-api-fix.patch
zram-trivial-fix-of-recompress_slot-coding-styles.patch
zram-fixup-read_block_state.patch
zram-drop-pp_in_progress.patch
zsmalloc-use-actual-object-size-to-detect-spans.patch
zsmalloc-introduce-sg-list-based-object-read-api.patch
zsmalloc-introduce-sg-list-based-object-read-api-fix.patch
zram-rename-init_lock-to-dev_lock.patch