[merged mm-stable] mm-kmemleak-factor-leak-confirmation-into-a-helper.patch removed from -mm tree

[merged mm-stable] mm-kmemleak-factor-leak-confirmation-into-a-helper.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: kmemleak: factor leak confirmation into a helper
has been removed from the -mm tree.  Its filename was
     mm-kmemleak-factor-leak-confirmation-into-a-helper.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: Breno Leitao <leitao@debian.org>
Subject: mm: kmemleak: factor leak confirmation into a helper
Date: Mon, 13 Jul 2026 04:48:06 -0700

The reporting loop in kmemleak_scan() decided whether to tag an object as
a reported leak with a four-term compound condition whose last operand
also had a side effect (++object->unref_scans).  Mixing the candidate
tests with the counter update made the check hard to read.

Move the state transition into confirm_leak(): it returns true when a
still-unreferenced suspect crosses min_unref_scans consecutive scans and
is newly flagged OBJECT_REPORTED, leaving only the reporting bookkeeping
in the caller.  No functional change.

Link: https://lore.kernel.org/20260713-catalin_pto-v1-3-5b93b1131089@debian.org
Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/kmemleak.c |   26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

--- a/mm/kmemleak.c~mm-kmemleak-factor-leak-confirmation-into-a-helper
+++ a/mm/kmemleak.c
@@ -2015,6 +2015,26 @@ scan_gray:
 }
 
 /*
+ * Promote a suspected object to a reported leak once it has stayed
+ * unreferenced for min_unref_scans consecutive scans. Called with
+ * object->lock held; returns true when the object is newly reported.
+ */
+static bool confirm_leak(struct kmemleak_object *object)
+{
+	if (!unreferenced_object(object) ||
+	    !(object->flags & OBJECT_SUSPECT) ||
+	    (object->flags & OBJECT_REPORTED))
+		return false;
+
+	object->unref_scans += 1;
+	if (object->unref_scans < min_unref_scans)
+		return false;
+
+	object->flags |= OBJECT_REPORTED;
+	return true;
+}
+
+/*
  * Scan the memory and report the unreferenced objects as leaks. Must be
  * called with the scan_mutex held.
  */
@@ -2074,11 +2094,7 @@ static void kmemleak_scan(void)
 		trace_handle = 0;
 		dedup_print = false;
 
-		if (unreferenced_object(object) &&
-		    (object->flags & OBJECT_SUSPECT) &&
-		    !(object->flags & OBJECT_REPORTED) &&
-		    ++object->unref_scans >= min_unref_scans) {
-			object->flags |= OBJECT_REPORTED;
+		if (confirm_leak(object)) {
 			if (kmemleak_verbose) {
 				trace_handle = object->trace_handle;
 				dedup_print = true;
_

Patches currently in -mm which might be from leitao@debian.org are