The patch titled
Subject: maple_tree: remove unneeded mas_wr_walk() in mas_store_prealloc()
has been added to the -mm mm-unstable branch. Its filename is
maple_tree-remove-unneeded-mas_wr_walk-in-mas_store_prealloc.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-unneeded-mas_wr_walk-in-mas_store_prealloc.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: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
Subject: maple_tree: remove unneeded mas_wr_walk() in mas_store_prealloc()
Date: Wed, 14 Aug 2024 12:19:43 -0400
Users of mas_store_prealloc() enter this function with nodes already
preallocated. This means the store type must be already set. We can then
remove the call to mas_wr_store_type() and initialize the write state to
continue the partial walk that was done when determining the store type.
Link: https://lkml.kernel.org/r/20240814161944.55347-17-sidhartha.kumar@xxxxxxxxxx
Reviewed-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/maple_tree.c | 18 +++++++++++++-----
1 file changed, 13 insertions(+), 5 deletions(-)
--- a/lib/maple_tree.c~maple_tree-remove-unneeded-mas_wr_walk-in-mas_store_prealloc
+++ a/lib/maple_tree.c
@@ -3979,9 +3979,6 @@ static inline void mas_wr_end_piv(struct
wr_mas->end_piv = wr_mas->pivots[wr_mas->offset_end];
else
wr_mas->end_piv = wr_mas->mas->max;
-
- if (!wr_mas->entry)
- mas_wr_extend_null(wr_mas);
}
static inline unsigned char mas_wr_new_end(struct ma_wr_state *wr_mas)
@@ -5532,8 +5529,19 @@ void mas_store_prealloc(struct ma_state
{
MA_WR_STATE(wr_mas, mas, entry);
- mas_wr_prealloc_setup(&wr_mas);
- mas_wr_store_type(&wr_mas);
+ if (mas->store_type == wr_store_root) {
+ mas_wr_prealloc_setup(&wr_mas);
+ goto store;
+ }
+
+ mas_wr_walk_descend(&wr_mas);
+ if (mas->store_type != wr_spanning_store) {
+ /* set wr_mas->content to current slot */
+ wr_mas.content = mas_slot_locked(mas, wr_mas.slots, mas->offset);
+ mas_wr_end_piv(&wr_mas);
+ }
+
+store:
trace_ma_write(__func__, mas, 0, entry);
mas_wr_store_entry(&wr_mas);
MAS_WR_BUG_ON(&wr_mas, mas_is_err(mas));
_
Patches currently in -mm which might be from sidhartha.kumar@xxxxxxxxxx are
maple_tree-reset-mas-index-and-mas-last-on-write-retries.patch
maple_tree-add-test-to-replicate-low-memory-race-conditions.patch
maple_tree-introduce-store_type-enum.patch
maple_tree-introduce-mas_wr_prealloc_setup.patch
maple_tree-move-up-mas_wr_store_setup-and-mas_wr_prealloc_setup.patch
maple_tree-introduce-mas_wr_store_type.patch
maple_tree-remove-mas_destroy-from-mas_nomem.patch
maple_tree-preallocate-nodes-in-mas_erase.patch
maple_tree-use-mas_store_gfp-in-mtree_store_range.patch
maple_tree-print-store-type-in-mas_dump.patch
maple_tree-use-store-type-in-mas_wr_store_entry.patch
maple_tree-convert-mas_insert-to-preallocate-nodes.patch
maple_tree-simplify-mas_commit_b_node.patch
maple_tree-remove-mas_wr_modify.patch
maple_tree-have-mas_store-allocate-nodes-if-needed.patch
maple_tree-remove-node-allocations-from-various-write-helper-functions.patch
maple_tree-remove-repeated-sanity-checks-from-write-helper-functions.patch
maple_tree-remove-unneeded-mas_wr_walk-in-mas_store_prealloc.patch
maple_tree-make-write-helper-functions-void.patch
