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Date: Thu, 10 Jul 2014 15:50:42 -0700
From: Chris Wright <chrisw@redhat.com>
To: "Daniel, Christopher" <Chris.Daniel@flukenetworks.com>
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Subject: Re: [dpdk-dev] Error while inserting module /build/kmod/igb_uio.ko
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* Daniel, Christopher (Chris.Daniel@flukenetworks.com) wrote:
> > On Jul 10, 2014, at 6:31 PM, "Chris Wright" <chrisw@redhat.com> wrote:
> > * Daniel, Christopher (Chris.Daniel@flukenetworks.com) wrote:
> >> Linux localhost.localdomain 3.12.6 #4 SMP Fri Dec 27 14:26:57 EST 2013 x86_64 x86_64 x86_64 GNU/Linux : Centos

OK, I expected to see a suffix like 3.12.6.el...(why I assumed you built
your own kernel)

> >> 1)      Downloaded the latest version of DPK ( 1.7);
> >> 2)      Executing the quick start instructions ( running gcc 4.7.x)
> >> 3)      Having an issue with
> >>      # insmod build/kmod/igb_uio.ko
> >> I am getting
> >> insmod: error inserting './build/kmod/igb_uio.ko': -1 Unknown symbol in module
> >> 
> >> dmesg:
> >> igb_uio: Unknown symbol __fentry__ (err 0)
> > 
> > seems like you have built module w/ CONFIG_FTRACE and built kernel
> > w/out.  did you manually set RTE_KERNELDIR when you built (if so, is it
> > pointing to the right location?)
> 
> Actually I did not build the kernel. It is unmodified from the original centos download.
> I also did not change any build parameters while building the module.
> Used all the defaults from the download and executed the commands as in the quick start guide.
> Is there something I can change and rebuild the dpk module ?

Hmm, you could verify a couple things:

$ uname -r
$ grep __fentry__ /proc/kallsyms
$ grep CONFIG_FTRACE /lib/modules/$(uname -r)/build/.config

thanks,
-chris