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lockdep: Use memset_startat() helper in reinit_class()

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

Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20211213132618.105737-1-xiujianfeng@huawei.com
This commit is contained in:
Xiu Jianfeng 2021-12-13 21:26:18 +08:00 committed by Peter Zijlstra
parent 54dff23214
commit e204193b13
1 changed files with 1 additions and 4 deletions
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5
kernel/locking/lockdep.c
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@ -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));