maple_tree: re-introduce entry to mas_preallocate() arguments

The current preallocation strategy is to preallocate the absolute
worst-case allocation for a tree modification.  The entry (or NULL) is
needed to know how many nodes are needed to write to the tree.  Start by
adding the argument to the mas_preallocate() definition.

Link: https://lkml.kernel.org/r/20230724183157.3939892-8-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Peng Zhang <zhangpeng.00@bytedance.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

5 files changed, 22 insertions, 21 deletions

diff --git a/include/linux/maple_tree.h b/include/linux/maple_tree.h
index e10db656e31c..c962af188681 100644
--- a/include/linux/maple_tree.h
+++ b/include/linux/maple_tree.h
@@ -466,7 +466,7 @@ void *mas_find(struct ma_state *mas, unsigned long max);
 void *mas_find_range(struct ma_state *mas, unsigned long max);
 void *mas_find_rev(struct ma_state *mas, unsigned long min);
 void *mas_find_range_rev(struct ma_state *mas, unsigned long max);
-int mas_preallocate(struct ma_state *mas, gfp_t gfp);
+int mas_preallocate(struct ma_state *mas, void *entry, gfp_t gfp);
 bool mas_is_err(struct ma_state *mas);
 
 bool mas_nomem(struct ma_state *mas, gfp_t gfp);
diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 3b6f8c8dac65..0d7e30c7d999 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -5529,11 +5529,12 @@ EXPORT_SYMBOL_GPL(mas_store_prealloc);
 /**
  * mas_preallocate() - Preallocate enough nodes for a store operation
  * @mas: The maple state
+ * @entry: The entry that will be stored
  * @gfp: The GFP_FLAGS to use for allocations.
  *
  * Return: 0 on success, -ENOMEM if memory could not be allocated.
  */
-int mas_preallocate(struct ma_state *mas, gfp_t gfp)
+int mas_preallocate(struct ma_state *mas, void *entry, gfp_t gfp)
 {
 	int ret;
 
diff --git a/mm/internal.h b/mm/internal.h
index c5ba08f55deb..65f646c2ccf3 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -1054,7 +1054,7 @@ static inline void vma_iter_config(struct vma_iterator *vmi,
  */
 static inline int vma_iter_prealloc(struct vma_iterator *vmi)
 {
-	return mas_preallocate(&vmi->mas, GFP_KERNEL);
+	return mas_preallocate(&vmi->mas, NULL, GFP_KERNEL);
 }
 
 static inline void vma_iter_clear(struct vma_iterator *vmi,
diff --git a/mm/mmap.c b/mm/mmap.c
index a1a59487390e..05e051f87273 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1960,7 +1960,7 @@ static int expand_upwards(struct vm_area_struct *vma, unsigned long address)
 		/* Check that both stack segments have the same anon_vma? */
 	}
 
-	if (mas_preallocate(&mas, GFP_KERNEL))
+	if (mas_preallocate(&mas, vma, GFP_KERNEL))
 		return -ENOMEM;
 
 	/* We must make sure the anon_vma is allocated. */
@@ -2050,7 +2050,7 @@ int expand_downwards(struct vm_area_struct *vma, unsigned long address)
 			return -ENOMEM;
 	}
 
-	if (mas_preallocate(&mas, GFP_KERNEL))
+	if (mas_preallocate(&mas, vma, GFP_KERNEL))
 		return -ENOMEM;
 
 	/* We must make sure the anon_vma is allocated. */
diff --git a/tools/testing/radix-tree/maple.c b/tools/testing/radix-tree/maple.c
index 9901ae821911..c6c1c5109deb 100644
--- a/tools/testing/radix-tree/maple.c
+++ b/tools/testing/radix-tree/maple.c
@@ -35458,7 +35458,7 @@ static noinline void __init check_prealloc(struct maple_tree *mt)
 	for (i = 0; i <= max; i++)
 		mtree_test_store_range(mt, i * 10, i * 10 + 5, &i);
 
-	MT_BUG_ON(mt, mas_preallocate(&mas, GFP_KERNEL) != 0);
+	MT_BUG_ON(mt, mas_preallocate(&mas, ptr, GFP_KERNEL) != 0);
 	allocated = mas_allocated(&mas);
 	height = mas_mt_height(&mas);
 	MT_BUG_ON(mt, allocated == 0);
@@ -35467,18 +35467,18 @@ static noinline void __init check_prealloc(struct maple_tree *mt)
 	allocated = mas_allocated(&mas);
 	MT_BUG_ON(mt, allocated != 0);
 
-	MT_BUG_ON(mt, mas_preallocate(&mas, GFP_KERNEL) != 0);
+	MT_BUG_ON(mt, mas_preallocate(&mas, ptr, GFP_KERNEL) != 0);
 	allocated = mas_allocated(&mas);
 	height = mas_mt_height(&mas);
 	MT_BUG_ON(mt, allocated == 0);
 	MT_BUG_ON(mt, allocated != 1 + height * 3);
-	MT_BUG_ON(mt, mas_preallocate(&mas, GFP_KERNEL) != 0);
+	MT_BUG_ON(mt, mas_preallocate(&mas, ptr, GFP_KERNEL) != 0);
 	mas_destroy(&mas);
 	allocated = mas_allocated(&mas);
 	MT_BUG_ON(mt, allocated != 0);
 
 
-	MT_BUG_ON(mt, mas_preallocate(&mas, GFP_KERNEL) != 0);
+	MT_BUG_ON(mt, mas_preallocate(&mas, ptr, GFP_KERNEL) != 0);
 	allocated = mas_allocated(&mas);
 	height = mas_mt_height(&mas);
 	MT_BUG_ON(mt, allocated == 0);
@@ -35487,26 +35487,26 @@ static noinline void __init check_prealloc(struct maple_tree *mt)
 	MT_BUG_ON(mt, mas_allocated(&mas) != allocated - 1);
 	mn->parent = ma_parent_ptr(mn);
 	ma_free_rcu(mn);
-	MT_BUG_ON(mt, mas_preallocate(&mas, GFP_KERNEL) != 0);
+	MT_BUG_ON(mt, mas_preallocate(&mas, ptr, GFP_KERNEL) != 0);
 	mas_destroy(&mas);
 	allocated = mas_allocated(&mas);
 	MT_BUG_ON(mt, allocated != 0);
 
-	MT_BUG_ON(mt, mas_preallocate(&mas, GFP_KERNEL) != 0);
+	MT_BUG_ON(mt, mas_preallocate(&mas, ptr, GFP_KERNEL) != 0);
 	allocated = mas_allocated(&mas);
 	height = mas_mt_height(&mas);
 	MT_BUG_ON(mt, allocated == 0);
 	MT_BUG_ON(mt, allocated != 1 + height * 3);
 	mn = mas_pop_node(&mas);
 	MT_BUG_ON(mt, mas_allocated(&mas) != allocated - 1);
-	MT_BUG_ON(mt, mas_preallocate(&mas, GFP_KERNEL) != 0);
+	MT_BUG_ON(mt, mas_preallocate(&mas, ptr, GFP_KERNEL) != 0);
 	mas_destroy(&mas);
 	allocated = mas_allocated(&mas);
 	MT_BUG_ON(mt, allocated != 0);
 	mn->parent = ma_parent_ptr(mn);
 	ma_free_rcu(mn);
 
-	MT_BUG_ON(mt, mas_preallocate(&mas, GFP_KERNEL) != 0);
+	MT_BUG_ON(mt, mas_preallocate(&mas, ptr, GFP_KERNEL) != 0);
 	allocated = mas_allocated(&mas);
 	height = mas_mt_height(&mas);
 	MT_BUG_ON(mt, allocated == 0);
@@ -35515,12 +35515,12 @@ static noinline void __init check_prealloc(struct maple_tree *mt)
 	MT_BUG_ON(mt, mas_allocated(&mas) != allocated - 1);
 	mas_push_node(&mas, mn);
 	MT_BUG_ON(mt, mas_allocated(&mas) != allocated);
-	MT_BUG_ON(mt, mas_preallocate(&mas, GFP_KERNEL) != 0);
+	MT_BUG_ON(mt, mas_preallocate(&mas, ptr, GFP_KERNEL) != 0);
 	mas_destroy(&mas);
 	allocated = mas_allocated(&mas);
 	MT_BUG_ON(mt, allocated != 0);
 
-	MT_BUG_ON(mt, mas_preallocate(&mas, GFP_KERNEL) != 0);
+	MT_BUG_ON(mt, mas_preallocate(&mas, ptr, GFP_KERNEL) != 0);
 	allocated = mas_allocated(&mas);
 	height = mas_mt_height(&mas);
 	MT_BUG_ON(mt, allocated == 0);
@@ -35528,21 +35528,21 @@ static noinline void __init check_prealloc(struct maple_tree *mt)
 	mas_store_prealloc(&mas, ptr);
 	MT_BUG_ON(mt, mas_allocated(&mas) != 0);
 
-	MT_BUG_ON(mt, mas_preallocate(&mas, GFP_KERNEL) != 0);
+	MT_BUG_ON(mt, mas_preallocate(&mas, ptr, GFP_KERNEL) != 0);
 	allocated = mas_allocated(&mas);
 	height = mas_mt_height(&mas);
 	MT_BUG_ON(mt, allocated == 0);
 	MT_BUG_ON(mt, allocated != 1 + height * 3);
 	mas_store_prealloc(&mas, ptr);
 	MT_BUG_ON(mt, mas_allocated(&mas) != 0);
-	MT_BUG_ON(mt, mas_preallocate(&mas, GFP_KERNEL) != 0);
+	MT_BUG_ON(mt, mas_preallocate(&mas, ptr, GFP_KERNEL) != 0);
 	allocated = mas_allocated(&mas);
 	height = mas_mt_height(&mas);
 	MT_BUG_ON(mt, allocated == 0);
 	MT_BUG_ON(mt, allocated != 1 + height * 3);
 	mas_store_prealloc(&mas, ptr);
 
-	MT_BUG_ON(mt, mas_preallocate(&mas, GFP_KERNEL) != 0);
+	MT_BUG_ON(mt, mas_preallocate(&mas, ptr, GFP_KERNEL) != 0);
 	allocated = mas_allocated(&mas);
 	height = mas_mt_height(&mas);
 	MT_BUG_ON(mt, allocated == 0);
@@ -35550,14 +35550,14 @@ static noinline void __init check_prealloc(struct maple_tree *mt)
 	mas_store_prealloc(&mas, ptr);
 	MT_BUG_ON(mt, mas_allocated(&mas) != 0);
 	mt_set_non_kernel(1);
-	MT_BUG_ON(mt, mas_preallocate(&mas, GFP_KERNEL & GFP_NOWAIT) == 0);
+	MT_BUG_ON(mt, mas_preallocate(&mas, ptr, GFP_KERNEL & GFP_NOWAIT) == 0);
 	allocated = mas_allocated(&mas);
 	height = mas_mt_height(&mas);
 	MT_BUG_ON(mt, allocated != 0);
 	mas_destroy(&mas);
 
 
-	MT_BUG_ON(mt, mas_preallocate(&mas, GFP_KERNEL) != 0);
+	MT_BUG_ON(mt, mas_preallocate(&mas, ptr, GFP_KERNEL) != 0);
 	allocated = mas_allocated(&mas);
 	height = mas_mt_height(&mas);
 	MT_BUG_ON(mt, allocated == 0);
@@ -35565,7 +35565,7 @@ static noinline void __init check_prealloc(struct maple_tree *mt)
 	mas_store_prealloc(&mas, ptr);
 	MT_BUG_ON(mt, mas_allocated(&mas) != 0);
 	mt_set_non_kernel(1);
-	MT_BUG_ON(mt, mas_preallocate(&mas, GFP_KERNEL & GFP_NOWAIT) == 0);
+	MT_BUG_ON(mt, mas_preallocate(&mas, ptr, GFP_KERNEL & GFP_NOWAIT) == 0);
 	allocated = mas_allocated(&mas);
 	height = mas_mt_height(&mas);
 	MT_BUG_ON(mt, allocated != 0);