Merge tag 'mm-hotfixes-stable-2024-06-17-11-43' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull misc fixes from Andrew Morton:
 "Mainly MM singleton fixes. And a couple of ocfs2 regression fixes"

* tag 'mm-hotfixes-stable-2024-06-17-11-43' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  kcov: don't lose track of remote references during softirqs
  mm: shmem: fix getting incorrect lruvec when replacing a shmem folio
  mm/debug_vm_pgtable: drop RANDOM_ORVALUE trick
  mm: fix possible OOB in numa_rebuild_large_mapping()
  mm/migrate: fix kernel BUG at mm/compaction.c:2761!
  selftests: mm: make map_fixed_noreplace test names stable
  mm/memfd: add documentation for MFD_NOEXEC_SEAL MFD_EXEC
  mm: mmap: allow for the maximum number of bits for randomizing mmap_base by default
  gcov: add support for GCC 14
  zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING
  mm: huge_memory: fix misused mapping_large_folio_support() for anon folios
  lib/alloc_tag: fix RCU imbalance in pgalloc_tag_get()
  lib/alloc_tag: do not register sysctl interface when CONFIG_SYSCTL=n
  MAINTAINERS: remove Lorenzo as vmalloc reviewer
  Revert "mm: init_mlocked_on_free_v3"
  mm/page_table_check: fix crash on ZONE_DEVICE
  gcc: disable '-Warray-bounds' for gcc-9
  ocfs2: fix NULL pointer dereference in ocfs2_abort_trigger()
  ocfs2: fix NULL pointer dereference in ocfs2_journal_dirty()

4 files changed, 15 insertions, 11 deletions

diff --git a/include/linux/kcov.h b/include/linux/kcov.h
index 1068a7318d89..75a2fb8b16c3 100644
--- a/include/linux/kcov.h
+++ b/include/linux/kcov.h
@@ -21,6 +21,8 @@ enum kcov_mode {
 	KCOV_MODE_TRACE_PC = 2,
 	/* Collecting comparison operands mode. */
 	KCOV_MODE_TRACE_CMP = 3,
+	/* The process owns a KCOV remote reference. */
+	KCOV_MODE_REMOTE = 4,
 };
 
 #define KCOV_IN_CTXSW	(1 << 30)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 9849dfda44d4..9a5652c5fadd 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3776,14 +3776,7 @@ DECLARE_STATIC_KEY_MAYBE(CONFIG_INIT_ON_FREE_DEFAULT_ON, init_on_free);
 static inline bool want_init_on_free(void)
 {
 	return static_branch_maybe(CONFIG_INIT_ON_FREE_DEFAULT_ON,
-				&init_on_free);
-}
-
-DECLARE_STATIC_KEY_MAYBE(CONFIG_INIT_MLOCKED_ON_FREE_DEFAULT_ON, init_mlocked_on_free);
-static inline bool want_init_mlocked_on_free(void)
-{
-	return static_branch_maybe(CONFIG_INIT_MLOCKED_ON_FREE_DEFAULT_ON,
-				&init_mlocked_on_free);
+				   &init_on_free);
 }
 
 extern bool _debug_pagealloc_enabled_early;
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index ee633712bba0..59f1df0cde5a 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -381,6 +381,10 @@ static inline void mapping_set_large_folios(struct address_space *mapping)
  */
 static inline bool mapping_large_folio_support(struct address_space *mapping)
 {
+	/* AS_LARGE_FOLIO_SUPPORT is only reasonable for pagecache folios */
+	VM_WARN_ONCE((unsigned long)mapping & PAGE_MAPPING_ANON,
+			"Anonymous mapping always supports large folio");
+
 	return IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) &&
 		test_bit(AS_LARGE_FOLIO_SUPPORT, &mapping->flags);
 }
diff --git a/include/linux/pgalloc_tag.h b/include/linux/pgalloc_tag.h
index 86ba5d33e43b..9cacadbd61f8 100644
--- a/include/linux/pgalloc_tag.h
+++ b/include/linux/pgalloc_tag.h
@@ -37,6 +37,9 @@ static inline union codetag_ref *get_page_tag_ref(struct page *page)
 
 static inline void put_page_tag_ref(union codetag_ref *ref)
 {
+	if (WARN_ON(!ref))
+		return;
+
 	page_ext_put(page_ext_from_codetag_ref(ref));
 }
 
@@ -102,9 +105,11 @@ static inline struct alloc_tag *pgalloc_tag_get(struct page *page)
 		union codetag_ref *ref = get_page_tag_ref(page);
 
 		alloc_tag_sub_check(ref);
-		if (ref && ref->ct)
-			tag = ct_to_alloc_tag(ref->ct);
-		put_page_tag_ref(ref);
+		if (ref) {
+			if (ref->ct)
+				tag = ct_to_alloc_tag(ref->ct);
+			put_page_tag_ref(ref);
+		}
 	}
 
 	return tag;