lkml.org 
[lkml]   [2014]   [Feb]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH v2 51/52] net/core/flow.c: Fix CPU hotplug callback registration
From
From: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Date: Fri, 14 Feb 2014 13:30:43 +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: 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: Ingo Molnar <mingo@kernel.org>
> Cc: netdev@vger.kernel.org
> Signed-off-by: David S. Miller <davem@davemloft.net>
> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>

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


\
 
 \ /
  Last update: 2014-02-14 20:21    [W:0.121 / U:0.104 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site