Merge tag 'mm-stable-2022-08-03' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull MM updates from Andrew Morton:
 "Most of the MM queue. A few things are still pending.

  Liam's maple tree rework didn't make it. This has resulted in a few
  other minor patch series being held over for next time.

  Multi-gen LRU still isn't merged as we were waiting for mapletree to
  stabilize. The current plan is to merge MGLRU into -mm soon and to
  later reintroduce mapletree, with a view to hopefully getting both
  into 6.1-rc1.

  Summary:

   - The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe
     Lin, Yang Shi, Anshuman Khandual and Mike Rapoport

   - Some kmemleak fixes from Patrick Wang and Waiman Long

   - DAMON updates from SeongJae Park

   - memcg debug/visibility work from Roman Gushchin

   - vmalloc speedup from Uladzislau Rezki

   - more folio conversion work from Matthew Wilcox

   - enhancements for coherent device memory mapping from Alex Sierra

   - addition of shared pages tracking and CoW support for fsdax, from
     Shiyang Ruan

   - hugetlb optimizations from Mike Kravetz

   - Mel Gorman has contributed some pagealloc changes to improve
     latency and realtime behaviour.

   - mprotect soft-dirty checking has been improved by Peter Xu

   - Many other singleton patches all over the place"

 [ XFS merge from hell as per Darrick Wong in

   https://lore.kernel.org/all/YshKnxb4VwXycPO8@magnolia/ ]

* tag 'mm-stable-2022-08-03' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (282 commits)
  tools/testing/selftests/vm/hmm-tests.c: fix build
  mm: Kconfig: fix typo
  mm: memory-failure: convert to pr_fmt()
  mm: use is_zone_movable_page() helper
  hugetlbfs: fix inaccurate comment in hugetlbfs_statfs()
  hugetlbfs: cleanup some comments in inode.c
  hugetlbfs: remove unneeded header file
  hugetlbfs: remove unneeded hugetlbfs_ops forward declaration
  hugetlbfs: use helper macro SZ_1{K,M}
  mm: cleanup is_highmem()
  mm/hmm: add a test for cross device private faults
  selftests: add soft-dirty into run_vmtests.sh
  selftests: soft-dirty: add test for mprotect
  mm/mprotect: fix soft-dirty check in can_change_pte_writable()
  mm: memcontrol: fix potential oom_lock recursion deadlock
  mm/gup.c: fix formatting in check_and_migrate_movable_page()
  xfs: fail dax mount if reflink is enabled on a partition
  mm/memcontrol.c: remove the redundant updating of stats_flush_threshold
  userfaultfd: don't fail on unrecognized features
  hugetlb_cgroup: fix wrong hugetlb cgroup numa stat
  ...

1 files changed, 10 insertions, 6 deletions

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 71d6edcbea48..34f784a1604b 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -386,7 +386,10 @@ static int zs_zpool_malloc(void *pool, size_t size, gfp_t gfp,
 			unsigned long *handle)
 {
 	*handle = zs_malloc(pool, size, gfp);
-	return *handle ? 0 : -1;
+
+	if (IS_ERR((void *)(*handle)))
+		return PTR_ERR((void *)*handle);
+	return 0;
 }
 static void zs_zpool_free(void *pool, unsigned long handle)
 {
@@ -1388,7 +1391,7 @@ static unsigned long obj_malloc(struct zs_pool *pool,
  * @gfp: gfp flags when allocating object
  *
  * On success, handle to the allocated object is returned,
- * otherwise 0.
+ * otherwise an ERR_PTR().
  * Allocation requests with size > ZS_MAX_ALLOC_SIZE will fail.
  */
 unsigned long zs_malloc(struct zs_pool *pool, size_t size, gfp_t gfp)
@@ -1399,11 +1402,11 @@ unsigned long zs_malloc(struct zs_pool *pool, size_t size, gfp_t gfp)
 	struct zspage *zspage;
 
 	if (unlikely(!size || size > ZS_MAX_ALLOC_SIZE))
-		return 0;
+		return (unsigned long)ERR_PTR(-EINVAL);
 
 	handle = cache_alloc_handle(pool, gfp);
 	if (!handle)
-		return 0;
+		return (unsigned long)ERR_PTR(-ENOMEM);
 
 	/* extra space in chunk to keep the handle */
 	size += ZS_HANDLE_SIZE;
@@ -1428,7 +1431,7 @@ unsigned long zs_malloc(struct zs_pool *pool, size_t size, gfp_t gfp)
 	zspage = alloc_zspage(pool, class, gfp);
 	if (!zspage) {
 		cache_free_handle(pool, handle);
-		return 0;
+		return (unsigned long)ERR_PTR(-ENOMEM);
 	}
 
 	spin_lock(&class->lock);
@@ -2169,7 +2172,8 @@ static int zs_register_shrinker(struct zs_pool *pool)
 	pool->shrinker.batch = 0;
 	pool->shrinker.seeks = DEFAULT_SEEKS;
 
-	return register_shrinker(&pool->shrinker);
+	return register_shrinker(&pool->shrinker, "mm-zspool:%s",
+				 pool->name);
 }
 
 /**