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2011-05-08sctp: Store a flowi in transports to provide persistent keying.David S. Miller
Several future simplifications are possible now because of this. For example, the sctp_addr unions can simply refer directly to the flowi information. Signed-off-by: David S. Miller <davem@davemloft.net>
2011-05-08ipv4: Use cork flow in ip_queue_xmit()David S. Miller
All invokers of ip_queue_xmit() must make certain that the socket is locked. All of SCTP, TCP, DCCP, and L2TP now make sure this is the case. Therefore we can use the cork flow during output route lookup in ip_queue_xmit() when the socket route check fails. Signed-off-by: David S. Miller <davem@davemloft.net>
2011-05-08ipv4: Use cork flow in inet_sk_{reselect_saddr,rebuild_header}()David S. Miller
These two functions must be invoked only when the socket is locked (because socket identity modifications are made non-atomically). Therefore we can use the cork flow for output route lookups. Signed-off-by: David S. Miller <davem@davemloft.net>
2011-05-08ipv4: Lock socket and use cork flow in ip4_datagram_connect().David S. Miller
This is to make sure that an l2tp socket's inet cork flow is fully filled in, when it's encapsulated in UDP. Signed-off-by: David S. Miller <davem@davemloft.net>
2011-05-08l2tp: Use cork flow in l2tp_ip_connect() and l2tp_ip_sendmsg()David S. Miller
Now that the socket is consistently locked in these two routines, this transformation is legal. Signed-off-by: David S. Miller <davem@davemloft.net>
2011-05-08l2tp: Fix locking in l2tp_core.cDavid S. Miller
l2tp_xmit_skb() must take the socket lock. It makes use of ip_queue_xmit() which expects to execute in a socket atomic context. Since we execute this function in software interrupts, we cannot use the usual lock_sock()/release_sock() sequence, instead we have to use bh_lock_sock() and see if a user has the socket locked, and if so drop the packet. Signed-off-by: David S. Miller <davem@davemloft.net>
2011-05-08l2tp: Fix locking in l2tp_ip.cDavid S. Miller
Both l2tp_ip_connect() and l2tp_ip_sendmsg() must take the socket lock. They both modify socket state non-atomically, and in particular l2tp_ip_sendmsg() increments socket private counters without using atomic operations. Signed-off-by: David S. Miller <davem@davemloft.net>
2011-05-08tcp: Use cork flow in tcp_v4_connect()David S. Miller
Since this is invoked from inet_stream_connect() the socket is locked and therefore this usage is safe. Signed-off-by: David S. Miller <davem@davemloft.net>
2011-05-08dccp: Use cork flow in dccp_v4_connect()David S. Miller
Since this is invoked from inet_stream_connect() the socket is locked and therefore this usage is safe. Signed-off-by: David S. Miller <davem@davemloft.net>
2011-05-08ethtool: remove phys_id from ethtool_opsStephen Hemminger
After that all the upstream kernel drivers now use phys_id, and the old ethtool_ops interface (phys_id) can be removed. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-05-08batman-adv: remove duplicate code from function is_bidirectional_neigh()Daniele Furlan
In function is_bidirectional_neigh the code that find out the one hop neighbor is duplicated. Signed-off-by: Daniele Furlan <daniele.furlan@gmail.com> Signed-off-by: Sven Eckelmann <sven@narfation.org>
2011-05-08batman-adv: Remove multiline comments from line endingSven Eckelmann
It is slightly irritating that comments after a long line span over multiple lines without any code. It is easier to put them before the actual code and reduce the number of lines which the eye has to read. Signed-off-by: Sven Eckelmann <sven@narfation.org>
2011-05-08batman-adv: rename everything from *hna* into *tt* (translation table)Antonio Quartulli
To be coherent, all the functions/variables/constants have been renamed to the TranslationTable style Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Sven Eckelmann <sven@narfation.org>
2011-05-08batman-adv: Fix refcount imbalance in find_routerMarek Lindner
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Sven Eckelmann <sven@narfation.org>
2011-05-08batman-adv: Avoid deadlock between rtnl_lock and s_activeSven Eckelmann
The hard_if_event is called by the notifier with rtnl_lock and tries to remove sysfs entries when a NETDEV_UNREGISTER event is received. This will automatically take the s_active lock. The s_active lock is also used when a new interface is added to a meshif through sysfs. In that situation we cannot wait for the rntl_lock before creating the actual batman-adv interface to prevent a deadlock. It is still possible to try to get the rtnl_lock and immediately abort the current operation when the trylock call failed. Signed-off-by: Sven Eckelmann <sven@narfation.org>
2011-05-08batman-adv: Remove unnecessary hardif_list_lockSven Eckelmann
hardif_list_lock is unneccessary because we already ensure that no multiple admin operations can take place through rtnl_lock. hardif_list_lock only adds additional overhead and complexity. Critical functions now check whether they are called with rtnl_lock using ASSERT_RTNL. It indirectly fixes the problem that orig_hash_del_if() expects that only one interface is deleted from hardif_list at a time, but hardif_remove_interfaces() removes all at once and then calls orig_hash_del_if(). Reported-by: Linus Lüssing <linus.luessing@web.de> Signed-off-by: Sven Eckelmann <sven@narfation.org>
2011-05-08batman-adv: multi vlan support for bridge loop detectionMarek Lindner
The bridge loop detection for batman-adv allows the bat0 interface to be bridged into an ethernet segment which other batman-adv nodes are connected to. In order to also allow multiple VLANs on top of the bat0 interface to be bridged into the ethernet segment this patch extends the aforementioned bridge loop detection. Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Sven Eckelmann <sven@narfation.org>
2011-05-08batman-adv: remove misplaced commentMarek Lindner
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Sven Eckelmann <sven@narfation.org>
2011-05-07net,rcu: convert call_rcu(prl_entry_destroy_rcu) to kfreePaul E. McKenney
The RCU callback prl_entry_destroy_rcu() just calls kfree(), so we can use kfree_rcu() instead of call_rcu(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> Cc: "Pekka Savola (ipv6)" <pekkas@netcore.fi> Cc: James Morris <jmorris@namei.org> Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org> Cc: Patrick McHardy <kaber@trash.net> Acked-by: David S. Miller <davem@davemloft.net> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07batman,rcu: convert call_rcu(softif_neigh_free_rcu) to kfree_rcuPaul E. McKenney
The RCU callback softif_neigh_free_rcu() just calls kfree(), so we can use kfree_rcu() instead of call_rcu(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Marek Lindner <lindner_marek@yahoo.de> Cc: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Acked-by: David S. Miller <davem@davemloft.net> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Acked-by: Sven Eckelmann <sven@narfation.org>
2011-05-07batman,rcu: convert call_rcu(neigh_node_free_rcu) to kfree()Paul E. McKenney
The RCU callback neigh_node_free_rcu() just calls kfree(), so we can use kfree_rcu() instead of call_rcu(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Marek Lindner <lindner_marek@yahoo.de> Cc: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Acked-by: David S. Miller <davem@davemloft.net> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Acked-by: Sven Eckelmann <sven@narfation.org>
2011-05-07batman,rcu: convert call_rcu(gw_node_free_rcu) to kfree_rcuPaul E. McKenney
The RCU callback gw_node_free_rcu() just calls kfree(), so we can use kfree_rcu() instead of call_rcu(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Marek Lindner <lindner_marek@yahoo.de> Cc: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Acked-by: David S. Miller <davem@davemloft.net> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Acked-by: Sven Eckelmann <sven@narfation.org>
2011-05-07net,rcu: convert call_rcu(kfree_tid_tx) to kfree_rcu()Lai Jiangshan
The rcu callback kfree_tid_tx() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(kfree_tid_tx). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: "John W. Linville" <linville@tuxdriver.com> Cc: Johannes Berg <johannes@sipsolutions.net> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Acked-by: "David S. Miller" <davem@davemloft.net>
2011-05-07net,rcu: convert call_rcu(xt_osf_finger_free_rcu) to kfree_rcu()Lai Jiangshan
The rcu callback xt_osf_finger_free_rcu() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(xt_osf_finger_free_rcu). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net/mac80211,rcu: convert call_rcu(work_free_rcu) to kfree_rcu()Lai Jiangshan
The rcu callback work_free_rcu() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(work_free_rcu). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: "John W. Linville" <linville@tuxdriver.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(wq_free_rcu) to kfree_rcu()Lai Jiangshan
The rcu callback wq_free_rcu() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(wq_free_rcu). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(phonet_device_rcu_free) to kfree_rcu()Lai Jiangshan
The rcu callback phonet_device_rcu_free() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(phonet_device_rcu_free). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(__nf_ct_ext_free_rcu) to kfree_rcu()Lai Jiangshan
The rcu callback __nf_ct_ext_free_rcu() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(__nf_ct_ext_free_rcu). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(net_generic_release) to kfree_rcu()Lai Jiangshan
The rcu callback net_generic_release() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(net_generic_release). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(netlbl_unlhsh_free_addr6) to kfree_rcu()Lai Jiangshan
The rcu callback netlbl_unlhsh_free_addr6() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(netlbl_unlhsh_free_addr6). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: Paul Moore <paul.moore@hp.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(netlbl_unlhsh_free_addr4) to kfree_rcu()Lai Jiangshan
The rcu callback netlbl_unlhsh_free_addr4() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(netlbl_unlhsh_free_addr4). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Paul Moore <paul.moore@hp.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(xps_dev_maps_release) to kfree_rcu()Lai Jiangshan
The rcu callback xps_dev_maps_release() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(xps_dev_maps_release). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(xps_map_release) to kfree_rcu()Lai Jiangshan
The rcu callback xps_map_release() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(xps_map_release). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(rps_map_release) to kfree_rcu()Lai Jiangshan
The rcu callback rps_map_release() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(rps_map_release). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(ipv6_mc_socklist_reclaim) to kfree_rcu()Lai Jiangshan
The rcu callback ipv6_mc_socklist_reclaim() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(ipv6_mc_socklist_reclaim). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(free_dm_hw_stat) to kfree_rcu()Lai Jiangshan
The rcu callback free_dm_hw_stat() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(free_dm_hw_stat). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(ip_mc_socklist_reclaim) to kfree_rcu()Lai Jiangshan
The rcu callback ip_mc_socklist_reclaim() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(ip_mc_socklist_reclaim). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(ip_sf_socklist_reclaim) to kfree_rcu()Lai Jiangshan
The rcu callback ip_sf_socklist_reclaim() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(ip_sf_socklist_reclaim). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(ip_mc_list_reclaim) to kfree_rcu()Lai Jiangshan
The rcu callback ip_mc_list_reclaim() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(ip_mc_list_reclaim). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(__gen_kill_estimator) to kfree_rcu()Lai Jiangshan
The rcu callback __gen_kill_estimator() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(__gen_kill_estimator). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(__leaf_info_free_rcu) to kfree_rcu()Lai Jiangshan
The rcu callback __leaf_info_free_rcu() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(__leaf_info_free_rcu). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(fc_rport_free_rcu) to kfree_rcu()Lai Jiangshan
The rcu callback fc_rport_free_rcu() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(fc_rport_free_rcu). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,act_police,rcu: remove rcu_barrier()Lai Jiangshan
There is no callback of this module maybe queued since we use kfree_rcu(), we can safely remove the rcu_barrier(). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(dn_dev_free_ifa_rcu) to kfree_rcu()Lai Jiangshan
The rcu callback dn_dev_free_ifa_rcu() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(dn_dev_free_ifa_rcu). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(ha_rcu_free) to kfree_rcu()Lai Jiangshan
The rcu callback ha_rcu_free() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(ha_rcu_free). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(sctp_local_addr_free) to kfree_rcu()Lai Jiangshan
The rcu callback sctp_local_addr_free() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(sctp_local_addr_free). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(listeners_free_rcu) to kfree_rcu()Lai Jiangshan
The rcu callback listeners_free_rcu() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(listeners_free_rcu). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(inet6_ifa_finish_destroy_rcu) to kfree_rcu()Lai Jiangshan
The rcu callback inet6_ifa_finish_destroy_rcu() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(inet6_ifa_finish_destroy_rcu). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(in6_dev_finish_destroy_rcu) to kfree_rcu()Lai Jiangshan
The rcu callback in6_dev_finish_destroy_rcu() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(in6_dev_finish_destroy_rcu). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-07net,rcu: convert call_rcu(tcf_police_free_rcu) to kfree_rcu()Lai Jiangshan
[PATCH 05/17] net,rcu: convert call_rcu(tcf_police_free_rcu) to kfree_rcu() The rcu callback tcf_police_free_rcu() just calls a kfree(), so we use kfree_rcu() instead of the call_rcu(tcf_police_free_rcu). Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>