netdev - Re: [PATCH net-next 0/7] net: add rcu annotations for ifa

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Message-Id: <20190530.142330.1051109681619079707.davem@davemloft.net>
Date:   Thu, 30 May 2019 14:23:30 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     fw@...len.de
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH net-next 0/7] net: add rcu annotations for ifa_list

From: Florian Westphal <fw@...len.de>
Date: Wed, 29 May 2019 13:43:25 +0200

> Eric Dumazet reported follwing problem:
> 
>   It looks that unless RTNL is held, accessing ifa_list needs proper RCU
>   protection.  indev->ifa_list can be changed under us by another cpu
>   (which owns RTNL) [..]
> 
>   A proper rcu_dereference() with an happy sparse support would require
>   adding __rcu attribute.
> 
> This patch series does that: add __rcu to the ifa_list pointers.
> That makes sparse complain, so the series also adds the required
> rcu_assign_pointer/dereference helpers where needed.
> 
> All patches except the last one are preparation work.
> Two new macros are introduced for in_ifaddr walks.
> 
> Last patch adds the __rcu annotations and the assign_pointer/dereference
> helper calls.
> 
> This patch is a bit large, but I found no better way -- other
> approaches (annotate-first or add helpers-first) all result in
> mid-series sparse warnings.
 ...

Florian, this series looks fine to me.

Please address David's feedback and respin.

Thanks.