From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Tue, 31 Aug 2010 07:40:16 +0000 (+0000)
Subject: net: add a comment on netdev->last_rx
X-Git-Tag: v2.6.37-rc1~147^2~620
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4dc89133f49b8cfd77ba7e83f5960aed63aaa99e;p=pandora-kernel.git

net: add a comment on netdev->last_rx

As some driver authors seem to reintroduce dev->last_rx use,
add a comment to strongly discourage this.

Since commit 6cf3f41e6c0 (bonding, net: Move last_rx update into bonding
recv logic), network drivers dont need to update last_rx themselves,
unless they use this field to implement a timeout.

Not updating last_rx helps not dirtying a cache line, improving
performance in SMP.

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