linux-hardening - [PATCH -next] lockdep: Use memset_startat() helper in reinit

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Date:   Mon, 13 Dec 2021 21:26:18 +0800
From:   Xiu Jianfeng <xiujianfeng@...wei.com>
To:     <peterz@...radead.org>, <mingo@...hat.com>, <will@...nel.org>,
        <longman@...hat.com>, <boqun.feng@...il.com>
CC:     <wangweiyang2@...wei.com>, <linux-kernel@...r.kernel.org>,
        <linux-hardening@...r.kernel.org>, <keescook@...omium.org>
Subject: [PATCH -next] lockdep: Use memset_startat() helper in reinit_class()

use memset_startat() helper to simplify the code, there is no functional
change in this patch.

Signed-off-by: Xiu Jianfeng <xiujianfeng@...wei.com>
---
 kernel/locking/lockdep.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 4a882f83aeb9..89b3df51fd98 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -6011,13 +6011,10 @@ static void zap_class(struct pending_free *pf, struct lock_class *class)
 
 static void reinit_class(struct lock_class *class)
 {
-	void *const p = class;
-	const unsigned int offset = offsetof(struct lock_class, key);
-
 	WARN_ON_ONCE(!class->lock_entry.next);
 	WARN_ON_ONCE(!list_empty(&class->locks_after));
 	WARN_ON_ONCE(!list_empty(&class->locks_before));
-	memset(p + offset, 0, sizeof(*class) - offset);
+	memset_startat(class, 0, key);
 	WARN_ON_ONCE(!class->lock_entry.next);
 	WARN_ON_ONCE(!list_empty(&class->locks_after));
 	WARN_ON_ONCE(!list_empty(&class->locks_before));
-- 
2.17.1