linux-kernel - [PATCH -next 2/5] mm/kmemleak: skip update_checksum for OBJECT_NO

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Date:   Mon, 21 Sep 2020 02:00:04 +0000
From:   Chen Jun <chenjun102@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
CC:     <catalin.marinas@....com>, <akpm@...ux-foundation.org>,
        <rui.xiang@...wei.com>, <weiyongjun1@...wei.com>
Subject: [PATCH -next 2/5] mm/kmemleak: skip update_checksum for OBJECT_NO_SCAN objects

From: Wei Yongjun <weiyongjun1@...wei.com>

Objects marked with OBJECT_NO_SCAN are never scanned.
So there is no need to update checksum for them.

Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
Signed-off-by: Chen Jun <chenjun102@...wei.com>
---
 mm/kmemleak.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index b3f603fd9fc3..c09c6b59eda6 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -1166,6 +1166,10 @@ static bool update_checksum(struct kmemleak_object *object)
 {
 	u32 old_csum = object->checksum;
 
+	/* always return false for not scan object */
+	if (object->flags & OBJECT_NO_SCAN)
+		return false;
+
 	kasan_disable_current();
 	kcsan_disable_current();
 	object->checksum = crc32(0, (void *)object->pointer, object->size);
-- 
2.25.0