linux-kernel - [PATCH 09/12] maple_tree: Remove mas

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Message-Id: <20231101171629.3612299-10-Liam.Howlett@oracle.com>
Date:   Wed,  1 Nov 2023 13:16:26 -0400
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     maple-tree@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>
Subject: [PATCH 09/12] maple_tree: Remove mas_searchable()

Now that the status of the maple state is outside of the node, the
mas_searchable() function can be dropped for easier open-coding of what
is going on.

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 lib/maple_tree.c                 | 66 ++++++++------------------------
 tools/testing/radix-tree/maple.c |  4 +-
 2 files changed, 19 insertions(+), 51 deletions(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index fa66c0c031d5..7518b3031b2b 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -273,17 +273,6 @@ static inline bool mas_is_underflow(struct ma_state *mas)
 	return mas->status == ma_underflow;
 }
 
-static inline bool mas_searchable(struct ma_state *mas)
-{
-	if (mas_is_none(mas))
-		return false;
-
-	if (mas_is_ptr(mas))
-		return false;
-
-	return true;
-}
-
 static __always_inline struct maple_node *mte_to_node(
 		const struct maple_enode *entry)
 {
@@ -6010,12 +5999,11 @@ static __always_inline bool mas_find_setup(struct ma_state *mas, unsigned long m
 
 	}
 
-	if (unlikely(!mas_searchable(mas))) {
-		if (unlikely(mas_is_ptr(mas)))
-			goto ptr_out_of_range;
+	if (unlikely(mas_is_ptr(mas)))
+		goto ptr_out_of_range;
 
+	if (unlikely(mas_is_none(mas)))
 		return true;
-	}
 
 	if (mas->index == max)
 		return true;
@@ -6142,20 +6130,18 @@ static bool mas_find_rev_setup(struct ma_state *mas, unsigned long min,
 			return true;
 	}
 
-	if (unlikely(!mas_searchable(mas))) {
-		if (mas_is_ptr(mas))
-			goto none;
+	if (unlikely(mas_is_ptr(mas)))
+		goto none;
 
-		if (mas_is_none(mas)) {
-			/*
-			 * Walked to the location, and there was nothing so the
-			 * previous location is 0.
-			 */
-			mas->last = mas->index = 0;
-			mas->status = ma_root;
-			*entry = mas_root(mas);
-			return true;
-		}
+	if (unlikely(mas_is_none(mas))) {
+		/*
+		 * Walked to the location, and there was nothing so the previous
+		 * location is 0.
+		 */
+		mas->last = mas->index = 0;
+		mas->status = ma_root;
+		*entry = mas_root(mas);
+		return true;
 	}
 
 active:
@@ -6613,7 +6599,7 @@ void *mt_find(struct maple_tree *mt, unsigned long *index, unsigned long max)
 	if (entry)
 		goto unlock;
 
-	while (mas_searchable(&mas) && (mas.last < max)) {
+	while (mas_is_active(&mas) && (mas.last < max)) {
 		entry = mas_next_entry(&mas, max);
 		if (likely(entry && !xa_is_zero(entry)))
 			break;
@@ -6695,26 +6681,6 @@ unsigned int mt_nr_allocated(void)
 	return kmem_cache_nr_allocated(maple_node_cache);
 }
 
-/*
- * mas_dead_node() - Check if the maple state is pointing to a dead node.
- * @mas: The maple state
- * @index: The index to restore in @mas.
- *
- * Used in test code.
- * Return: 1 if @mas has been reset to MAS_START, 0 otherwise.
- */
-static inline int mas_dead_node(struct ma_state *mas, unsigned long index)
-{
-	if (unlikely(!mas_searchable(mas) || mas_is_start(mas)))
-		return 0;
-
-	if (likely(!mte_dead_node(mas->node)))
-		return 0;
-
-	mas_rewalk(mas, index);
-	return 1;
-}
-
 void mt_cache_shrink(void)
 {
 }
@@ -7266,7 +7232,7 @@ void mt_validate(struct maple_tree *mt)
 	MA_STATE(mas, mt, 0, 0);
 	rcu_read_lock();
 	mas_start(&mas);
-	if (!mas_searchable(&mas))
+	if (!mas_is_active(&mas))
 		goto done;
 
 	while (!mte_is_leaf(mas.node))
diff --git a/tools/testing/radix-tree/maple.c b/tools/testing/radix-tree/maple.c
index 57964aec2122..182f4e4d9967 100644
--- a/tools/testing/radix-tree/maple.c
+++ b/tools/testing/radix-tree/maple.c
@@ -974,8 +974,10 @@ static inline void *mas_range_load(struct ma_state *mas,
 	if (likely(mas->offset != MAPLE_NODE_SLOTS))
 		entry = mas_get_slot(mas, mas->offset);
 
-	if (mas_dead_node(mas, index))
+	if (mas_is_active(mas) && mte_dead_node(mas->node)) {
+		mas_set(mas, index);
 		goto retry;
+	}
 
 	return entry;
 }
-- 
2.40.1