Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

net/devlink/leftover.c / net/core/devlink.c:
  565b4824c39f ("devlink: change port event netdev notifier from per-net to global")
  f05bd8ebeb69 ("devlink: move code to a dedicated directory")
  687125b5799c ("devlink: split out core code")
https://lore.kernel.org/all/20230208094657.379f2b1a@canb.auug.org.au/

Signed-off-by: Jakub Kicinski <kuba@kernel.org>

4 files changed, 133 insertions, 12 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 36c34c9909fa..3509115a0e85 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -763,6 +763,7 @@ config DEBUG_KMEMLEAK
 	select KALLSYMS
 	select CRC32
 	select STACKDEPOT
+	select STACKDEPOT_ALWAYS_INIT if !DEBUG_KMEMLEAK_DEFAULT_OFF
 	help
 	  Say Y here if you want to enable the memory leak
 	  detector. The memory allocation/freeing is traced in a way
@@ -1216,7 +1217,7 @@ config SCHED_DEBUG
 	depends on DEBUG_KERNEL && PROC_FS
 	default y
 	help
-	  If you say Y here, the /proc/sched_debug file will be provided
+	  If you say Y here, the /sys/kernel/debug/sched file will be provided
 	  that can help debug the scheduler. The runtime overhead of this
 	  option is minimal.
 
diff --git a/lib/dec_and_lock.c b/lib/dec_and_lock.c
index 9555b68bb774..1dcca8f2e194 100644
--- a/lib/dec_and_lock.c
+++ b/lib/dec_and_lock.c
@@ -49,3 +49,34 @@ int _atomic_dec_and_lock_irqsave(atomic_t *atomic, spinlock_t *lock,
 	return 0;
 }
 EXPORT_SYMBOL(_atomic_dec_and_lock_irqsave);
+
+int _atomic_dec_and_raw_lock(atomic_t *atomic, raw_spinlock_t *lock)
+{
+	/* Subtract 1 from counter unless that drops it to 0 (ie. it was 1) */
+	if (atomic_add_unless(atomic, -1, 1))
+		return 0;
+
+	/* Otherwise do it the slow way */
+	raw_spin_lock(lock);
+	if (atomic_dec_and_test(atomic))
+		return 1;
+	raw_spin_unlock(lock);
+	return 0;
+}
+EXPORT_SYMBOL(_atomic_dec_and_raw_lock);
+
+int _atomic_dec_and_raw_lock_irqsave(atomic_t *atomic, raw_spinlock_t *lock,
+				     unsigned long *flags)
+{
+	/* Subtract 1 from counter unless that drops it to 0 (ie. it was 1) */
+	if (atomic_add_unless(atomic, -1, 1))
+		return 0;
+
+	/* Otherwise do it the slow way */
+	raw_spin_lock_irqsave(lock, *flags);
+	if (atomic_dec_and_test(atomic))
+		return 1;
+	raw_spin_unlock_irqrestore(lock, *flags);
+	return 0;
+}
+EXPORT_SYMBOL(_atomic_dec_and_raw_lock_irqsave);
diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 26e2045d3cda..5a976393c9ae 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -670,12 +670,13 @@ static inline unsigned long mte_pivot(const struct maple_enode *mn,
 				 unsigned char piv)
 {
 	struct maple_node *node = mte_to_node(mn);
+	enum maple_type type = mte_node_type(mn);
 
-	if (piv >= mt_pivots[piv]) {
+	if (piv >= mt_pivots[type]) {
 		WARN_ON(1);
 		return 0;
 	}
-	switch (mte_node_type(mn)) {
+	switch (type) {
 	case maple_arange_64:
 		return node->ma64.pivot[piv];
 	case maple_range_64:
@@ -4887,7 +4888,7 @@ static bool mas_rev_awalk(struct ma_state *mas, unsigned long size)
 	unsigned long *pivots, *gaps;
 	void __rcu **slots;
 	unsigned long gap = 0;
-	unsigned long max, min, index;
+	unsigned long max, min;
 	unsigned char offset;
 
 	if (unlikely(mas_is_err(mas)))
@@ -4909,8 +4910,7 @@ static bool mas_rev_awalk(struct ma_state *mas, unsigned long size)
 		min = mas_safe_min(mas, pivots, --offset);
 
 	max = mas_safe_pivot(mas, pivots, offset, type);
-	index = mas->index;
-	while (index <= max) {
+	while (mas->index <= max) {
 		gap = 0;
 		if (gaps)
 			gap = gaps[offset];
@@ -4941,10 +4941,8 @@ static bool mas_rev_awalk(struct ma_state *mas, unsigned long size)
 		min = mas_safe_min(mas, pivots, offset);
 	}
 
-	if (unlikely(index > max)) {
-		mas_set_err(mas, -EBUSY);
-		return false;
-	}
+	if (unlikely((mas->index > max) || (size - 1 > max - mas->index)))
+		goto no_space;
 
 	if (unlikely(ma_is_leaf(type))) {
 		mas->offset = offset;
@@ -4961,9 +4959,11 @@ static bool mas_rev_awalk(struct ma_state *mas, unsigned long size)
 	return false;
 
 ascend:
-	if (mte_is_root(mas->node))
-		mas_set_err(mas, -EBUSY);
+	if (!mte_is_root(mas->node))
+		return false;
 
+no_space:
+	mas_set_err(mas, -EBUSY);
 	return false;
 }
 
diff --git a/lib/test_maple_tree.c b/lib/test_maple_tree.c
index 497fc93ccf9e..ec847bf4dcb4 100644
--- a/lib/test_maple_tree.c
+++ b/lib/test_maple_tree.c
@@ -2517,6 +2517,91 @@ static noinline void check_bnode_min_spanning(struct maple_tree *mt)
 	mt_set_non_kernel(0);
 }
 
+static noinline void check_empty_area_window(struct maple_tree *mt)
+{
+	unsigned long i, nr_entries = 20;
+	MA_STATE(mas, mt, 0, 0);
+
+	for (i = 1; i <= nr_entries; i++)
+		mtree_store_range(mt, i*10, i*10 + 9,
+				  xa_mk_value(i), GFP_KERNEL);
+
+	/* Create another hole besides the one at 0 */
+	mtree_store_range(mt, 160, 169, NULL, GFP_KERNEL);
+
+	/* Check lower bounds that don't fit */
+	rcu_read_lock();
+	MT_BUG_ON(mt, mas_empty_area_rev(&mas, 5, 90, 10) != -EBUSY);
+
+	mas_reset(&mas);
+	MT_BUG_ON(mt, mas_empty_area_rev(&mas, 6, 90, 5) != -EBUSY);
+
+	/* Check lower bound that does fit */
+	mas_reset(&mas);
+	MT_BUG_ON(mt, mas_empty_area_rev(&mas, 5, 90, 5) != 0);
+	MT_BUG_ON(mt, mas.index != 5);
+	MT_BUG_ON(mt, mas.last != 9);
+	rcu_read_unlock();
+
+	/* Check one gap that doesn't fit and one that does */
+	rcu_read_lock();
+	mas_reset(&mas);
+	MT_BUG_ON(mt, mas_empty_area_rev(&mas, 5, 217, 9) != 0);
+	MT_BUG_ON(mt, mas.index != 161);
+	MT_BUG_ON(mt, mas.last != 169);
+
+	/* Check one gap that does fit above the min */
+	mas_reset(&mas);
+	MT_BUG_ON(mt, mas_empty_area_rev(&mas, 100, 218, 3) != 0);
+	MT_BUG_ON(mt, mas.index != 216);
+	MT_BUG_ON(mt, mas.last != 218);
+
+	/* Check size that doesn't fit any gap */
+	mas_reset(&mas);
+	MT_BUG_ON(mt, mas_empty_area_rev(&mas, 100, 218, 16) != -EBUSY);
+
+	/*
+	 * Check size that doesn't fit the lower end of the window but
+	 * does fit the gap
+	 */
+	mas_reset(&mas);
+	MT_BUG_ON(mt, mas_empty_area_rev(&mas, 167, 200, 4) != -EBUSY);
+
+	/*
+	 * Check size that doesn't fit the upper end of the window but
+	 * does fit the gap
+	 */
+	mas_reset(&mas);
+	MT_BUG_ON(mt, mas_empty_area_rev(&mas, 100, 162, 4) != -EBUSY);
+
+	/* Check mas_empty_area forward */
+	mas_reset(&mas);
+	MT_BUG_ON(mt, mas_empty_area(&mas, 0, 100, 9) != 0);
+	MT_BUG_ON(mt, mas.index != 0);
+	MT_BUG_ON(mt, mas.last != 8);
+
+	mas_reset(&mas);
+	MT_BUG_ON(mt, mas_empty_area(&mas, 0, 100, 4) != 0);
+	MT_BUG_ON(mt, mas.index != 0);
+	MT_BUG_ON(mt, mas.last != 3);
+
+	mas_reset(&mas);
+	MT_BUG_ON(mt, mas_empty_area(&mas, 0, 100, 11) != -EBUSY);
+
+	mas_reset(&mas);
+	MT_BUG_ON(mt, mas_empty_area(&mas, 5, 100, 6) != -EBUSY);
+
+	mas_reset(&mas);
+	MT_BUG_ON(mt, mas_empty_area(&mas, 0, 8, 10) != -EBUSY);
+
+	mas_reset(&mas);
+	mas_empty_area(&mas, 100, 165, 3);
+
+	mas_reset(&mas);
+	MT_BUG_ON(mt, mas_empty_area(&mas, 100, 163, 6) != -EBUSY);
+	rcu_read_unlock();
+}
+
 static DEFINE_MTREE(tree);
 static int maple_tree_seed(void)
 {
@@ -2765,6 +2850,10 @@ static int maple_tree_seed(void)
 	check_bnode_min_spanning(&tree);
 	mtree_destroy(&tree);
 
+	mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE);
+	check_empty_area_window(&tree);
+	mtree_destroy(&tree);
+
 #if defined(BENCH)
 skip:
 #endif