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maple_tree: refine ma_state init from mas_start() 

If mas->node is an MAS_START, there are three cases, and they all assign
different values to mas->node and mas->offset.  So there is no need to set
them to a default value before updating.

Update them directly to make them easier to understand and for better
readability.

Link: https://lkml.kernel.org/r/20221221060058.609003-7-vernon2gm@gmail.com
Signed-off-by: Vernon Yang <vernon2gm@gmail.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Vernon Yang 2022-12-21 14:00:57 +08:00 committed by Andrew Morton
parent eabb305293
commit 46b3458482
1 changed files with 3 additions and 3 deletions
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6
lib/maple_tree.c
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@ -1329,7 +1329,7 @@ static void mas_node_count(struct ma_state *mas, int count)
* mas_start() - Sets up maple state for operations.
* @mas: The maple state.
*
* If mas->node == MAS_START, then set the min, max, depth, and offset to
* If mas->node == MAS_START, then set the min, max and depth to
* defaults.
*
* Return:
@ -1343,22 +1343,22 @@ static inline struct maple_enode *mas_start(struct ma_state *mas)
if (likely(mas_is_start(mas))) {
struct maple_enode *root;
mas->node = MAS_NONE;
mas->min = 0;
mas->max = ULONG_MAX;
mas->depth = 0;
mas->offset = 0;
root = mas_root(mas);
/* Tree with nodes */
if (likely(xa_is_node(root))) {
mas->depth = 1;
mas->node = mte_safe_root(root);
mas->offset = 0;
return NULL;
}
/* empty tree */
if (unlikely(!root)) {
mas->node = MAS_NONE;
mas->offset = MAPLE_NODE_SLOTS;
return NULL;
}