[merged mm-stable] mm-damon-core-add-damon_del_region-debug_sanity-check.patch removed from -mm tree

[merged mm-stable] mm-damon-core-add-damon_del_region-debug_sanity-check.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/damon/core: add damon_del_region() debug_sanity check
has been removed from the -mm tree.  Its filename was
     mm-damon-core-add-damon_del_region-debug_sanity-check.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: SeongJae Park <sj@kernel.org>
Subject: mm/damon/core: add damon_del_region() debug_sanity check
Date: Fri, 6 Mar 2026 07:29:06 -0800

damon_del_region() should be called for targets that have one or more
regions.  Add a sanity check for that under CONFIG_DAMON_DEBUG_SANITY.

Link: https://lkml.kernel.org/r/20260306152914.86303-4-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <davidgow@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/core.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

--- a/mm/damon/core.c~mm-damon-core-add-damon_del_region-debug_sanity-check
+++ a/mm/damon/core.c
@@ -152,8 +152,21 @@ void damon_add_region(struct damon_regio
 	t->nr_regions++;
 }
 
+#ifdef CONFIG_DAMON_DEBUG_SANITY
+static void damon_verify_del_region(struct damon_target *t)
+{
+	WARN_ONCE(t->nr_regions == 0, "t->nr_regions == 0\n");
+}
+#else
+static void damon_verify_del_region(struct damon_target *t)
+{
+}
+#endif
+
 static void damon_del_region(struct damon_region *r, struct damon_target *t)
 {
+	damon_verify_del_region(t);
+
 	list_del(&r->list);
 	t->nr_regions--;
 }
_

Patches currently in -mm which might be from sj@kernel.org are

mm-damon-sysfs-dealloc-repeat_call_control-if-damon_call-fails.patch