From: Wei Yang <richard.weiyang@gmail.com>
Date: Fri, 13 Sep 2024 06:31:28 +0000 (+0000)
Subject: maple_tree: root node could be handled by !p_slot too
X-Git-Tag: v6.13-rc1~99^2~135
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=0cc8d68abe2fdcb7039ece95f784698c0b0dc51e;p=thirdparty%2Fkernel%2Flinux.git

maple_tree: root node could be handled by !p_slot too

For a root node, mte_parent_slot() return 0, this exactly fits the
following !p_slot check.

So we can remove the special handling for root node.

Link: https://lkml.kernel.org/r/20240913063128.27391-1-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index cdac15168405b..c2d3c8d273584 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -2155,9 +2155,7 @@ static inline bool mas_prev_sibling(struct ma_state *mas)
 {
 	unsigned int p_slot = mte_parent_slot(mas->node);
 
-	if (mte_is_root(mas->node))
-		return false;
-
+	/* For root node, p_slot is set to 0 by mte_parent_slot(). */
 	if (!p_slot)
 		return false;