netdev - Re: [PATCH] net: do not use rcu in rtnl_dump

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Date:	Fri, 27 Feb 2015 18:19:27 +0100
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Eric Dumazet <eric.dumazet@...il.com>, nicolas.dichtel@...nd.com,
	David Miller <davem@...emloft.net>
CC:	Cong Wang <xiyou.wangcong@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] net: do not use rcu in rtnl_dump_ifinfo()

On 02/27/2015 06:07 PM, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
>
> We did a failed attempt in the past to only use rcu in rtnl dump
> operations (commit e67f88dd12f6 "net: dont hold rtnl mutex during
> netlink dump callbacks")
>
> Now that dumps are holding RTNL anyway, there is no need to also
> use rcu locking, as it forbids any scheduling ability, like
> GFP_KERNEL allocations that controlling path should use instead
> of GFP_ATOMIC whenever possible.
>
> This should fix following splat Cong Wang reported :
>
> ===============================

[ Btw, I think patchwork has an issue with above line when fetching
   the mbox : it thinks commit description ends here. :(

   Prefixing with a space char should help to not get it lost. ]
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