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From:   Peng Zhang <zhangpeng.00@bytedance.com>
To:     Liam.Howlett@oracle.com
Cc:     akpm@linux-foundation.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, maple-tree@lists.infradead.org,
        Peng Zhang <zhangpeng.00@bytedance.com>
Subject: [PATCH 02/10] maple_tree: Drop mtree_alloc_{range,rrange}() and related functions.
Date:   Mon, 15 May 2023 21:17:49 +0800
Message-Id: <20230515131757.60035-3-zhangpeng.00@bytedance.com>
In-Reply-To: <20230515131757.60035-1-zhangpeng.00@bytedance.com>
References: <20230515131757.60035-1-zhangpeng.00@bytedance.com>
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Drop mtree_alloc_{range,rrange}(), mas_{rev_}alloc() and mas_fill_gap().
mtree_alloc_{range,rrange}() currently have no users and can be easily
implemented with mas_empty_area{_rev}(). mas_{rev_}alloc() and
mas_fill_gap() are just their internal functions, drop them together.

Signed-off-by: Peng Zhang <zhangpeng.00@bytedance.com>
---
 include/linux/maple_tree.h |   7 --
 lib/maple_tree.c           | 177 -------------------------------------
 2 files changed, 184 deletions(-)

diff --git a/include/linux/maple_tree.h b/include/linux/maple_tree.h
index 542b09118a09f..3dd6edccf83af 100644
--- a/include/linux/maple_tree.h
+++ b/include/linux/maple_tree.h
@@ -306,13 +306,6 @@ int mtree_insert(struct maple_tree *mt, unsigned long index,
 		void *entry, gfp_t gfp);
 int mtree_insert_range(struct maple_tree *mt, unsigned long first,
 		unsigned long last, void *entry, gfp_t gfp);
-int mtree_alloc_range(struct maple_tree *mt, unsigned long *startp,
-		void *entry, unsigned long size, unsigned long min,
-		unsigned long max, gfp_t gfp);
-int mtree_alloc_rrange(struct maple_tree *mt, unsigned long *startp,
-		void *entry, unsigned long size, unsigned long min,
-		unsigned long max, gfp_t gfp);
-
 int mtree_store_range(struct maple_tree *mt, unsigned long first,
 		      unsigned long last, void *entry, gfp_t gfp);
 int mtree_store(struct maple_tree *mt, unsigned long index,
diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index b37065a6f570d..49dfe81dfa1b6 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -5120,46 +5120,6 @@ static inline void mas_awalk(struct ma_state *mas, unsigned long size)
 	}
 }
 
-/*
- * mas_fill_gap() - Fill a located gap with @entry.
- * @mas: The maple state
- * @entry: The value to store
- * @slot: The offset into the node to store the @entry
- * @size: The size of the entry
- * @index: The start location
- */
-static inline void mas_fill_gap(struct ma_state *mas, void *entry,
-		unsigned char slot, unsigned long size, unsigned long *index)
-{
-	MA_WR_STATE(wr_mas, mas, entry);
-	unsigned char pslot = mte_parent_slot(mas->node);
-	struct maple_enode *mn = mas->node;
-	unsigned long *pivots;
-	enum maple_type ptype;
-	/*
-	 * mas->index is the start address for the search
-	 *  which may no longer be needed.
-	 * mas->last is the end address for the search
-	 */
-
-	*index = mas->index;
-	mas->last = mas->index + size - 1;
-
-	/*
-	 * It is possible that using mas->max and mas->min to correctly
-	 * calculate the index and last will cause an issue in the gap
-	 * calculation, so fix the ma_state here
-	 */
-	mas_ascend(mas);
-	ptype = mte_node_type(mas->node);
-	pivots = ma_pivots(mas_mn(mas), ptype);
-	mas->max = mas_safe_pivot(mas, pivots, pslot, ptype);
-	mas->min = mas_safe_min(mas, pivots, pslot);
-	mas->node = mn;
-	mas->offset = slot;
-	mas_wr_store_entry(&wr_mas);
-}
-
 /*
  * mas_sparse_area() - Internal function.  Return upper or lower limit when
  * searching for a gap in an empty tree.
@@ -5307,74 +5267,6 @@ int mas_empty_area_rev(struct ma_state *mas, unsigned long min,
 }
 EXPORT_SYMBOL_GPL(mas_empty_area_rev);
 
-static inline int mas_alloc(struct ma_state *mas, void *entry,
-		unsigned long size, unsigned long *index)
-{
-	unsigned long min;
-
-	mas_start(mas);
-	if (mas_is_none(mas) || mas_is_ptr(mas)) {
-		mas_root_expand(mas, entry);
-		if (mas_is_err(mas))
-			return xa_err(mas->node);
-
-		if (!mas->index)
-			return mas_pivot(mas, 0);
-		return mas_pivot(mas, 1);
-	}
-
-	/* Must be walking a tree. */
-	mas_awalk(mas, size);
-	if (mas_is_err(mas))
-		return xa_err(mas->node);
-
-	if (mas->offset == MAPLE_NODE_SLOTS)
-		goto no_gap;
-
-	/*
-	 * At this point, mas->node points to the right node and we have an
-	 * offset that has a sufficient gap.
-	 */
-	min = mas->min;
-	if (mas->offset)
-		min = mas_pivot(mas, mas->offset - 1) + 1;
-
-	if (mas_is_err(mas))
-		return xa_err(mas->node);
-
-	if (mas->index < min)
-		mas->index = min;
-
-	mas_fill_gap(mas, entry, mas->offset, size, index);
-	return 0;
-
-no_gap:
-	return -EBUSY;
-}
-
-static inline int mas_rev_alloc(struct ma_state *mas, unsigned long min,
-				unsigned long max, void *entry,
-				unsigned long size, unsigned long *index)
-{
-	int ret = 0;
-
-	ret = mas_empty_area_rev(mas, min, max, size);
-	if (ret)
-		return ret;
-
-	if (mas_is_err(mas))
-		return xa_err(mas->node);
-
-	if (mas->offset == MAPLE_NODE_SLOTS)
-		goto no_gap;
-
-	mas_fill_gap(mas, entry, mas->offset, size, index);
-	return 0;
-
-no_gap:
-	return -EBUSY;
-}
-
 /*
  * mte_dead_leaves() - Mark all leaves of a node as dead.
  * @mas: The maple state
@@ -6481,75 +6373,6 @@ int mtree_insert(struct maple_tree *mt, unsigned long index, void *entry,
 }
 EXPORT_SYMBOL(mtree_insert);
 
-int mtree_alloc_range(struct maple_tree *mt, unsigned long *startp,
-		void *entry, unsigned long size, unsigned long min,
-		unsigned long max, gfp_t gfp)
-{
-	int ret = 0;
-
-	MA_STATE(mas, mt, min, min);
-	if (!mt_is_alloc(mt))
-		return -EINVAL;
-
-	if (WARN_ON_ONCE(mt_is_reserved(entry)))
-		return -EINVAL;
-
-	if (min > max)
-		return -EINVAL;
-
-	if (max < size)
-		return -EINVAL;
-
-	if (!size)
-		return -EINVAL;
-
-	mtree_lock(mt);
-retry:
-	mas.offset = 0;
-	mas.index = min;
-	mas.last = max - size + 1;
-	ret = mas_alloc(&mas, entry, size, startp);
-	if (mas_nomem(&mas, gfp))
-		goto retry;
-
-	mtree_unlock(mt);
-	return ret;
-}
-EXPORT_SYMBOL(mtree_alloc_range);
-
-int mtree_alloc_rrange(struct maple_tree *mt, unsigned long *startp,
-		void *entry, unsigned long size, unsigned long min,
-		unsigned long max, gfp_t gfp)
-{
-	int ret = 0;
-
-	MA_STATE(mas, mt, min, max - size + 1);
-	if (!mt_is_alloc(mt))
-		return -EINVAL;
-
-	if (WARN_ON_ONCE(mt_is_reserved(entry)))
-		return -EINVAL;
-
-	if (min > max)
-		return -EINVAL;
-
-	if (max < size - 1)
-		return -EINVAL;
-
-	if (!size)
-		return -EINVAL;
-
-	mtree_lock(mt);
-retry:
-	ret = mas_rev_alloc(&mas, min, max, entry, size, startp);
-	if (mas_nomem(&mas, gfp))
-		goto retry;
-
-	mtree_unlock(mt);
-	return ret;
-}
-EXPORT_SYMBOL(mtree_alloc_rrange);
-
 /**
  * mtree_erase() - Find an index and erase the entire range.
  * @mt: The maple tree
-- 
2.20.1