From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Thu, 17 Nov 2011 03:13:26 +0000 (+0000)
Subject: net: use jump_label to shortcut RPS if not setup
X-Git-Tag: v3.3-rc1~182^2~543
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=adc9300e78e6091a7eaa1821213836379d4dbaa8;p=pandora-kernel.git

net: use jump_label to shortcut RPS if not setup

Most machines dont use RPS/RFS, and pay a fair amount of instructions in
netif_receive_skb() / netif_rx() / get_rps_cpu() just to discover
RPS/RFS is not setup.

Add a jump_label named rps_needed.

If no device rps_map or global rps_sock_flow_table is setup,
netif_receive_skb() / netif_rx() do a single instruction instead of many
ones, including conditional jumps.

jmp +0    (if CONFIG_JUMP_LABEL=y)

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

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