tree 7629fa72b5a13cbf48d43659bb396984caf7362a
parent ba4fd9d8282f7f856f2287fe8be784d1dfdda28b
author Eric Dumazet <eric.dumazet@gmail.com> 1283240416 +0000
committer David S. Miller <davem@davemloft.net> 1283287026 -0700

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>