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Date:	Fri, 27 Feb 2015 10:35:21 -0800
From:	Cong Wang <>
To:	Daniel Borkmann <>
Cc:	Eric Dumazet <>,
	Nicolas Dichtel <>,
	David Miller <>,
	Cong Wang <>,
	netdev <>
Subject: Re: [PATCH] net: do not use rcu in rtnl_dump_ifinfo()

On Fri, Feb 27, 2015 at 9:19 AM, Daniel Borkmann <> wrote:
> On 02/27/2015 06:07 PM, Eric Dumazet wrote:
>> From: Eric Dumazet <>
>> 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. ]

To save everyone's time, either fix patchwork or teach checkpatch.
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