[ovs-dev] datapath: Check for backported skb_frag_page().

[Tadaaki Nagao]

Hi,

I noticed that recently released CentOS 6.3 (and probably also RHEL
6.3, I assume) backported skb_frag_page() to their 2.6.32-based
kernel, which prevented Open vSwitch kernel modules from building.

I'll send a patch I made to aid this build issue.

I'd really appreciate it if you kindly take a look at it and apply it
to your tree if it looks appropriate.

Thanks,
Tadaaki Nagao <nagao at stratosphere.co.jp>
Stratosphere Inc.