+ ksm-stop-iterating-vmas-when-ksm_test_exit-returns-true.patch added to mm-new branch

+ ksm-stop-iterating-vmas-when-ksm_test_exit-returns-true.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: ksm: stop iterating VMAs when ksm_test_exit returns true
has been added to the -mm mm-new branch.  Its filename is
     ksm-stop-iterating-vmas-when-ksm_test_exit-returns-true.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/ksm-stop-iterating-vmas-when-ksm_test_exit-returns-true.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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and is updated there most days

------------------------------------------------------
From: Wang Wensheng <wsw9603@163.com>
Subject: ksm: stop iterating VMAs when ksm_test_exit returns true
Date: Sun, 26 Jul 2026 21:35:01 +0800

In scan_get_next_rmap_item() the break statement only exits the inner
while loop, leaving remaining VMAs to be iterated even if ksm_test_exit()
returns true.  Replace it with a goto statement to avoid the unnecessary
work.

Link: https://lore.kernel.org/20260726133501.504048-1-wsw9603@163.com
Signed-off-by: Wang Wensheng <wsw9603@163.com>
Reviewed-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 |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/ksm.c~ksm-stop-iterating-vmas-when-ksm_test_exit-returns-true
+++ a/mm/ksm.c
@@ -2701,7 +2701,7 @@ next_mm:
 			struct folio *folio;
 
 			if (ksm_test_exit(mm))
-				break;
+				goto no_vmas;
 
 			int found;
 
_

Patches currently in -mm which might be from wsw9603@163.com are

ksm-stop-iterating-vmas-when-ksm_test_exit-returns-true.patch