The patch titled
Subject: maple_tree: remove maple_big_node.parent
has been added to the -mm mm-unstable branch. Its filename is
maple_tree-remove-maple_big_nodeparent.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/maple_tree-remove-maple_big_nodeparent.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: maple_tree: remove maple_big_node.parent
Date: Sun, 8 Sep 2024 14:05:53 +0000
Patch series "Reduce the space to be cleared for maple_big_node", v2.
Found current code may clear maple_big_node redundantly.
First we define a field parent, which is never used. After removing this,
we reduce the size of memory to be cleared by memset.
Then mast_fill_bnode() clears part of the structure twice, since slot and
gap share some space. By clearing the whole structure, we can avoid this.
This patch (of 2):
The member parent of maple_big_node is never used.
Let's remove it which could reduce the number of space to be cleared on
memset.
Link: https://lkml.kernel.org/r/20240908140554.20378-1-richard.weiyang@xxxxxxxxx
Link: https://lkml.kernel.org/r/20240908140554.20378-2-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Reviewed-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/maple_tree.c | 1 -
1 file changed, 1 deletion(-)
--- a/lib/maple_tree.c~maple_tree-remove-maple_big_nodeparent
+++ a/lib/maple_tree.c
@@ -120,7 +120,6 @@ static const unsigned char mt_min_slots[
#define MAPLE_BIG_NODE_GAPS (MAPLE_ARANGE64_SLOTS * 2 + 1)
struct maple_big_node {
- struct maple_pnode *parent;
unsigned long pivot[MAPLE_BIG_NODE_SLOTS - 1];
union {
struct maple_enode *slot[MAPLE_BIG_NODE_SLOTS];
_
Patches currently in -mm which might be from richard.weiyang@xxxxxxxxx are
maple_tree-i-is-always-less-than-or-equal-to-mas_end.patch
maple_tree-goto-complete-directly-on-a-pivot-of-0.patch
maple_tree-remove-maple_big_nodeparent.patch
maple_tree-memset-maple_big_node-as-a-whole.patch
