netdev - Re: [PATCH v2 net-next 07/14] rtnetlink: Protect struct rtnl_link

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Message-ID: <67a84928-a451-4b10-a5c0-d1e30b9421a9@redhat.com>
Date: Tue, 22 Oct 2024 10:42:33 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Kuniyuki Iwashima <kuniyu@...zon.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>
Cc: Kuniyuki Iwashima <kuni1840@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next 07/14] rtnetlink: Protect struct rtnl_link_ops
 with SRCU.

On 10/22/24 10:35, Paolo Abeni wrote:
> On 10/16/24 20:53, Kuniyuki Iwashima wrote:
>> @@ -457,15 +457,29 @@ EXPORT_SYMBOL_GPL(__rtnl_unregister_many);
>>  
>>  static LIST_HEAD(link_ops);
>>  
>> -static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
>> +static struct rtnl_link_ops *rtnl_link_ops_get(const char *kind, int *srcu_index)
>>  {
> 
> This lacks an 'acquire' annotation to make sparse happy. Similar thing
> for the _put() helper. Also if let such helper to cope with NULL ops,
> some dups checks could be avoided in later code.
> 
> Since the netdev backlog is huge, I don't consider this blocking, but
> please follow-up ASAP,

Just ignore the above comment. Unfortunately we can't attach the
relevant annotation to rtnl_link_ops_get().

/P