[merged mm-stable] mm-zsmalloc-fix-migrate_write_lock-when-config_compaction.patch removed from -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The quilt patch titled
     Subject: mm/zsmalloc: fix migrate_write_lock() when !CONFIG_COMPACTION
has been removed from the -mm tree.  Its filename was
     mm-zsmalloc-fix-migrate_write_lock-when-config_compaction.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Chengming Zhou <zhouchengming@bytedance.com>
Subject: mm/zsmalloc: fix migrate_write_lock() when !CONFIG_COMPACTION
Date: Mon, 19 Feb 2024 13:33:51 +0000

Patch series "mm/zsmalloc: fix and optimize objects/page migration".

This series is to fix and optimize the zsmalloc objects/page migration.


This patch (of 3):

migrate_write_lock() is a empty function when !CONFIG_COMPACTION, in which
case zs_compact() can be triggered from shrinker reclaim context.  (Maybe
it's better to rename it to zs_shrink()?)

And zspage map object users rely on this migrate_read_lock() so object
won't be migrated elsewhere.

Fix it by always implementing the migrate_write_lock() related functions.

Link: https://lkml.kernel.org/r/20240219-b4-szmalloc-migrate-v1-0-34cd49c6545b@bytedance.com
Link: https://lkml.kernel.org/r/20240219-b4-szmalloc-migrate-v1-1-34cd49c6545b@bytedance.com
Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Yosry Ahmed <yosryahmed@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/zsmalloc.c |    9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

--- a/mm/zsmalloc.c~mm-zsmalloc-fix-migrate_write_lock-when-config_compaction
+++ a/mm/zsmalloc.c
@@ -278,18 +278,15 @@ static bool ZsHugePage(struct zspage *zs
 static void migrate_lock_init(struct zspage *zspage);
 static void migrate_read_lock(struct zspage *zspage);
 static void migrate_read_unlock(struct zspage *zspage);
-
-#ifdef CONFIG_COMPACTION
 static void migrate_write_lock(struct zspage *zspage);
 static void migrate_write_lock_nested(struct zspage *zspage);
 static void migrate_write_unlock(struct zspage *zspage);
+
+#ifdef CONFIG_COMPACTION
 static void kick_deferred_free(struct zs_pool *pool);
 static void init_deferred_free(struct zs_pool *pool);
 static void SetZsPageMovable(struct zs_pool *pool, struct zspage *zspage);
 #else
-static void migrate_write_lock(struct zspage *zspage) {}
-static void migrate_write_lock_nested(struct zspage *zspage) {}
-static void migrate_write_unlock(struct zspage *zspage) {}
 static void kick_deferred_free(struct zs_pool *pool) {}
 static void init_deferred_free(struct zs_pool *pool) {}
 static void SetZsPageMovable(struct zs_pool *pool, struct zspage *zspage) {}
@@ -1725,7 +1722,6 @@ static void migrate_read_unlock(struct z
 	read_unlock(&zspage->lock);
 }
 
-#ifdef CONFIG_COMPACTION
 static void migrate_write_lock(struct zspage *zspage)
 {
 	write_lock(&zspage->lock);
@@ -1741,6 +1737,7 @@ static void migrate_write_unlock(struct
 	write_unlock(&zspage->lock);
 }
 
+#ifdef CONFIG_COMPACTION
 /* Number of isolated subpage for *page migration* in this zspage */
 static void inc_zspage_isolation(struct zspage *zspage)
 {
_

Patches currently in -mm which might be from zhouchengming@bytedance.com are

mm-zswap-global-lru-and-shrinker-shared-by-all-zswap_pools.patch
mm-zswap-change-zswap_pool-kref-to-percpu_ref.patch