Re: [PATCH 50/51] net/core/flow.c: Fix CPU hotplug callback registration

[David Miller <davem@davemloft.net>]

From: David Miller <davem@davemloft.net>
Date: Thu, 06 Feb 2014 20:39:21 -0800 (PST)

> From: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
> Date: Thu, 06 Feb 2014 03:43:46 +0530
> 
>> Subsystems that want to register CPU hotplug callbacks, as well as perform
>> initialization for the CPUs that are already online, often do it as shown
>> below:
>  ...
>> This is wrong, since it is prone to ABBA deadlocks involving the
>> cpu_add_remove_lock and the cpu_hotplug.lock (when running concurrently
>> with CPU hotplug operations).
>> 
>> Instead, the correct and race-free way of performing the callback
>> registration is:
>  ...
>> Fix the code in net/core/flow.c by using this latter form of callback
>> registration.
>> 
>> Cc: "David S. Miller" <davem@davemloft.net>
>> Cc: Li RongQing <roy.qing.li@gmail.com>
>> Cc: Sasha Levin <sasha.levin@oracle.com>
>> Cc: Andrew Morton <akpm@linux-foundation.org>
>> Cc: Chris Metcalf <cmetcalf@tilera.com>
>> Cc: netdev@vger.kernel.org
>> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
> 
> Applied.

I just realized that this has a dependency not in the 'net'
tree, so I reverted and assume you will merge this with the
patch that provides the necessary interface(s).

Signed-off-by: David S. Miller <davem@davemloft.net>