Commit 3f05fcde authored by Peng Zhang's avatar Peng Zhang Committed by Andrew Morton
Browse files

maple_tree: avoid ascending when mas->min is also the parent's minimum 

When the child node is the first child of its parent node, mas->min does
not need to be updated. This can reduce the number of ascending times
in some cases.

Link: https://lkml.kernel.org/r/20231120070937.35481-3-zhangpeng.00@bytedance.com


Signed-off-by: default avatarPeng Zhang <zhangpeng.00@bytedance.com>
Reviewed-by: default avatarLiam R. Howlett <Liam.Howlett@oracle.com>
Cc: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 2e783f0c

lib/maple_tree.c

+5 −3
Original line number Diff line number Diff line
@@ -1088,14 +1088,16 @@ static int mas_ascend(struct ma_state *mas) 
		return 0;

	}



	if (!mas->min)

	min = 0;

	max = ULONG_MAX;

	if (!mas->offset) {

		min = mas->min;

		set_min = true;

	}



	if (mas->max == ULONG_MAX)

		set_max = true;



	min = 0;

	max = ULONG_MAX;

	do {

		p_enode = a_enode;

		a_type = mas_parent_type(mas, p_enode);