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Date: Thu, 23 Sep 2021 10:09:25 -0700 From: Eric Dumazet <eric.dumazet@...il.com> To: Yajun Deng <yajun.deng@...ux.dev>, davem@...emloft.net, kuba@...nel.org Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH net-next] net: rtnetlink: convert rcu_assign_pointer to RCU_INIT_POINTER On 9/17/21 11:36 PM, Yajun Deng wrote: > It no need barrier when assigning a NULL value to an RCU protected > pointer. So use RCU_INIT_POINTER() instead for more fast. > > Signed-off-by: Yajun Deng <yajun.deng@...ux.dev> > --- > net/core/rtnetlink.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c > index 972c8cb303a5..327ca6bc6e6d 100644 > --- a/net/core/rtnetlink.c > +++ b/net/core/rtnetlink.c > @@ -301,7 +301,7 @@ int rtnl_unregister(int protocol, int msgtype) > } > > link = rtnl_dereference(tab[msgindex]); > - rcu_assign_pointer(tab[msgindex], NULL); > + RCU_INIT_POINTER(tab[msgindex], NULL); > rtnl_unlock(); > > kfree_rcu(link, rcu); > @@ -337,7 +337,7 @@ void rtnl_unregister_all(int protocol) > if (!link) > continue; > > - rcu_assign_pointer(tab[msgindex], NULL); > + RCU_INIT_POINTER(tab[msgindex], NULL); > kfree_rcu(link, rcu); > } > rtnl_unlock(); > FYI, there is no memory barrier involved in rcu_assign_pointer(tab[msgindex], NULL); This has been the case for the last 5 years. Your patch was not needed really.
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