[to-be-updated] maple_tree-drop-dead-code-from-mas_extend_spanning_null.patch removed from -mm tree

The quilt patch titled
     Subject: maple_tree: drop dead code from mas_extend_spanning_null()
has been removed from the -mm tree.  Its filename was
     maple_tree-drop-dead-code-from-mas_extend_spanning_null.patch

This patch was dropped because an updated version will be issued

------------------------------------------------------
From: "Liam R. Howlett (Oracle)" <[email protected]>
Subject: maple_tree: drop dead code from mas_extend_spanning_null()
Date: Tue, 30 Jun 2026 15:08:29 -0400

mas_extend_spanning_null() had a clause if the end of the range being
written (mas->last) is the same as the end of the existing range it is
overwriting (wr_mas->r_max), action will be taken.

This code path is not possible because the only calling function
increments mas->last (unless it's ULONG_MAX) to walk to one beyond the
write and then resets the value back to the initial value.

In the case of mas->last == ULONG_MAX, then the second part of the
statement will always be false - mas->last cannot be less than the node
max.

This code never executed and is flawed anyways (the arguments are
incorrectly ordered), so removing it is the safest action.  Since the code
never executes, it is not fixing any issue so Fixes tag is not given.

Link: https://lore.kernel.org/[email protected]
Signed-off-by: Liam R. Howlett (Oracle) <[email protected]>
Cc: Boqun Feng <[email protected]>
Cc: Chris Mason <[email protected]>
Cc: Chuck Lever <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jason Gunthorpe <[email protected]>
Cc: Joe Perches <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Waiman Long <[email protected]>
Cc: Will Deacon <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---

 lib/maple_tree.c |    7 -------
 1 file changed, 7 deletions(-)

--- a/lib/maple_tree.c~maple_tree-drop-dead-code-from-mas_extend_spanning_null
+++ a/lib/maple_tree.c
@@ -2997,13 +2997,6 @@ static inline void mas_extend_spanning_n
 		if (r_mas->last < r_wr_mas->r_max)
 			r_mas->last = r_wr_mas->r_max;
 		r_mas->offset++;
-	} else if ((r_mas->last == r_wr_mas->r_max) &&
-	    (r_mas->last < r_mas->max) &&
-	    !mas_slot_locked(r_mas, r_wr_mas->slots, r_mas->offset + 1)) {
-		r_mas->last = mas_safe_pivot(r_mas, r_wr_mas->pivots,
-					     r_wr_mas->type, r_mas->offset + 1);
-		r_mas->offset++;
-		r_wr_mas->r_max = r_mas->last;
 	}
 }
 
_

Patches currently in -mm which might be from [email protected] are

maple_tree-drop-maple_alloc_slots.patch
maple_tree-clarify-comments-on-mas_nomem.patch
maple_tree-use-prefetched-value-in-mas_wr_store_type.patch
maple_tree-optimise-mas_wr_node_store-when-not-in-rcu-mode.patch
maple_tree-micro-optimisation-of-mas_wr_store_type.patch
maple_tree-add-bulk-parent-set-helper.patch
maple_tree-catch-race-in-mas_alloc_cyclic.patch
maple_tree-document-that-erase-may-use-gfp_kernel-for-allocations.patch
maple_tree-warn_on_once-when-allocations-fail.patch
maple_tree-document-erase-and-allocations-better.patch
maple_tree-change-two-gfp-flags-in-tests.patch
maple_tree-fix-argument-name-in-header.patch
maple_tree-avoid-extra-gap-calculation.patch
maple_tree-add-helper-mas_make_walkable.patch