From e44e23c9371bc2071a1ca5e0f9df89ca7726988e Mon Sep 17 00:00:00 2001
From: Jann Horn <jannh@google.com>
Date: Thu, 14 Aug 2025 17:11:10 +0200
Subject: [PATCH] 
 kasan-add-test-for-slab_typesafe_by_rcu-quarantine-skipping-v3

make comment more verbose

Link: https://lkml.kernel.org/r/20250814-kasan-tsbrcu-noquarantine-test-v3-1-9e9110009b4e@google.com
Signed-off-by: Jann Horn <jannh@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 mm/kasan/kasan_test_c.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/kasan/kasan_test_c.c b/mm/kasan/kasan_test_c.c
index 47ff5cd941c71..4cf2b5f8d6c14 100644
--- a/mm/kasan/kasan_test_c.c
+++ b/mm/kasan/kasan_test_c.c
@@ -1076,6 +1076,8 @@ static void kmem_cache_rcu_uaf(struct kunit *test)
 /*
  * Check that SLAB_TYPESAFE_BY_RCU objects are immediately reused when
  * CONFIG_SLUB_RCU_DEBUG is off, and stay at the same address.
+ * Without this, KASAN builds would be unable to trigger bugs caused by
+ * SLAB_TYPESAFE_BY_RCU users handling reycled objects improperly.
  */
 static void kmem_cache_rcu_reuse(struct kunit *test)
 {
-- 
2.51.0