[merged mm-stable] mm-ksm-initialize-the-addr-only-once-in-collect_procs_ksm.patch removed from -mm tree

[merged mm-stable] mm-ksm-initialize-the-addr-only-once-in-collect_procs_ksm.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/ksm: initialize the addr only once in collect_procs_ksm
has been removed from the -mm tree.  Its filename was
     mm-ksm-initialize-the-addr-only-once-in-collect_procs_ksm.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: xu xin <xu.xin16@zte.com.cn>
Subject: mm/ksm: initialize the addr only once in collect_procs_ksm
Date: Thu, 9 Jul 2026 17:32:12 +0800 (CST)

Patch series "KSM: use linear_page_index in collect_procs_ksm()", v2.

In collect_procs_ksm() which is used to collect processes when the error
hit an ksm page, there is the same issue with rmap_walk_ksm (see the
previous discussion at [1]).  So we apply the similar logic changes to the
collect_procs_ksm().

The patch [1/2] move the initializaion of addr from the position inside
loop to the position before the loop, since the variable will not change
in the loop.

The patch [2/2] optimize collect_procs_ksm by passing a suitable page
offset range to the anon_vma_interval_tree_foreach loop to reduce
ineffective checks.


This patch (of 2):

Similar to 318d87b8fa7 ("ksm: initialize the addr only once in
rmap_walk_ksm"), only initialize the addr once in rmap_walk_ksm because
the addr variable doesn't change across iterations.

Link: https://lore.kernel.org/20260709173212190rZdwynySRyLr9EtPuXBRU@zte.com.cn
Link: https://lore.kernel.org/all/20260703162253688u8Str9eFLR8TGCmo7nIOF@zte.com.cn/ [1]
Signed-off-by: xu xin <xu.xin16@zte.com.cn>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Chengming Zhou <chengming.zhou@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/ksm.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/mm/ksm.c~mm-ksm-initialize-the-addr-only-once-in-collect_procs_ksm
+++ a/mm/ksm.c
@@ -3289,7 +3289,7 @@ void collect_procs_ksm(const struct foli
 		rcu_read_lock();
 		for_each_process(tsk) {
 			struct anon_vma_chain *vmac;
-			unsigned long addr;
+			const unsigned long addr = rmap_item->address & PAGE_MASK;
 			struct task_struct *t =
 				task_early_kill(tsk, force_early);
 			if (!t)
@@ -3299,7 +3299,6 @@ void collect_procs_ksm(const struct foli
 			{
 				vma = vmac->vma;
 				if (vma->vm_mm == t->mm) {
-					addr = rmap_item->address & PAGE_MASK;
 					add_to_kill_ksm(t, page, vma, to_kill,
 							addr);
 				}
_

Patches currently in -mm which might be from xu.xin16@zte.com.cn are

mm-mm_sloth-add-a-helper-function-mm_slot_remove.patch
mm-mm_sloth-add-comments-for-mm_slot_lookup-insert.patch