From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Fri, 30 Oct 2009 07:11:27 +0000 (+0000)
Subject: net: Introduce dev_get_by_name_rcu()
X-Git-Tag: v2.6.33-rc1~388^2~568
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=72c9528bab94cc052d00ce241b8e85f5d71e45f0;p=pandora-kernel.git

net: Introduce dev_get_by_name_rcu()

Some workloads hit dev_base_lock rwlock pretty hard.
We can use RCU lookups to avoid touching this rwlock
(and avoid touching netdevice refcount)

netdevices are already freed after a RCU grace period, so this patch
adds no penalty at device dismantle time.

However, it adds a synchronize_rcu() call in dev_change_name()

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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