Merge tag 'mm-hotfixes-stable-2022-12-22-14-34' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull hotfixes from Andrew Morton:
 "Eight fixes, all cc:stable. One is for gcov and the remainder are MM"

* tag 'mm-hotfixes-stable-2022-12-22-14-34' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  gcov: add support for checksum field
  test_maple_tree: add test for mas_spanning_rebalance() on insufficient data
  maple_tree: fix mas_spanning_rebalance() on insufficient data
  hugetlb: really allocate vma lock for all sharable vmas
  kmsan: export kmsan_handle_urb
  kmsan: include linux/vmalloc.h
  mm/mempolicy: fix memory leak in set_mempolicy_home_node system call
  mm, mremap: fix mremap() expanding vma with addr inside vma

Author: torvalds

kernel/gcov/gcc_4_7.c

@@ -82,6 +82,7 @@ struct gcov_fn_info {
  * @version: gcov version magic indicating the gcc version used for compilation
  * @next: list head for a singly-linked list
  * @stamp: uniquifying time stamp
+ * @checksum: unique object checksum
  * @filename: name of the associated gcov data file
  * @merge: merge functions (null for unused counter type)
  * @n_functions: number of instrumented functions
@@ -94,6 +95,10 @@ struct gcov_info {
 	unsigned int version;
 	struct gcov_info *next;
 	unsigned int stamp;
+ /* Since GCC 12.1 a checksum field is added. */
+#if (__GNUC__ >= 12)
+	unsigned int checksum;
+#endif
 	const char *filename;
 	void (*merge[GCOV_COUNTERS])(gcov_type *, unsigned int);
 	unsigned int n_functions;

lib/maple_tree.c

@@ -2994,7 +2994,9 @@ static int mas_spanning_rebalance(struct ma_state *mas,
 	mast->free = &free;
 	mast->destroy = &destroy;
 	l_mas.node = r_mas.node = m_mas.node = MAS_NONE;
-	if (!(mast->orig_l->min && mast->orig_r->max == ULONG_MAX) &&
+
+	/* Check if this is not root and has sufficient data.  */
+	if (((mast->orig_l->min != 0) || (mast->orig_r->max != ULONG_MAX)) &&
 	    unlikely(mast->bn->b_end <= mt_min_slots[mast->bn->type]))
 		mast_spanning_rebalance(mast);
 

lib/test_maple_tree.c

@@ -2498,6 +2498,25 @@ static noinline void check_dup(struct maple_tree *mt)
 	}
 }
 
+static noinline void check_bnode_min_spanning(struct maple_tree *mt)
+{
+	int i = 50;
+	MA_STATE(mas, mt, 0, 0);
+
+	mt_set_non_kernel(9999);
+	mas_lock(&mas);
+	do {
+		mas_set_range(&mas, i*10, i*10+9);
+		mas_store(&mas, check_bnode_min_spanning);
+	} while (i--);
+
+	mas_set_range(&mas, 240, 509);
+	mas_store(&mas, NULL);
+	mas_unlock(&mas);
+	mas_destroy(&mas);
+	mt_set_non_kernel(0);
+}
+
 static DEFINE_MTREE(tree);
 static int maple_tree_seed(void)
 {
@@ -2742,6 +2761,10 @@ static int maple_tree_seed(void)
 	check_dup(&tree);
 	mtree_destroy(&tree);
 
+	mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE);
+	check_bnode_min_spanning(&tree);
+	mtree_destroy(&tree);
+
 #if defined(BENCH)
 skip:
 #endif