[ovs-dev] [PATCH 2/2] datapath: Resolve external module dependencies.

Rajahalme, Jarno (NSN - FI/Espoo) jarno.rajahalme at nsn.com
Wed Jun 26 16:18:56 UTC 2013

On Jun 26, 2013, at 18:27 , ext Jesse Gross wrote:

> On Wed, Jun 26, 2013 at 8:05 AM, Rajahalme, Jarno (NSN - FI/Espoo)
> <jarno.rajahalme at nsn.com> wrote:
>> On Jun 25, 2013, at 22:31 , ext Jesse Gross wrote:
>>> The Open vSwitch kernel module now has dependencies on symbols
>>> exported by other kernel modules (currently just for GRE). In
>>> order for it to load, the dependencies must be correctly resolved
>>> ahead of time. This runs depmod as part of the module installation
>>> process and updates the installation instructions.
>>> Reported-by: Justin Pettit <jpettit at nicira.com>
>>> Signed-off-by: Jesse Gross <jesse at nicira.com>
>>> ---
>> ...
>>> diff --git a/datapath/linux/Makefile.main.in b/datapath/linux/Makefile.main.in
>>> index 2e445ac..a62e0ca 100644
>>> --- a/datapath/linux/Makefile.main.in
>>> +++ b/datapath/linux/Makefile.main.in
>>> @@ -71,6 +71,7 @@ default:
>>> modules_install:
>>>      $(MAKE) -C $(KSRC) M=$(builddir) modules_install
>>> +     depmod `cat $(KSRC)/include/config/kernel.release`
>> This line does not work on my system. 'cat' produces "3.2.46", while /lib/modules contains:
>> 2.6.32-5-amd64  2.6.39-2-amd64  3.1.0-1-amd64  3.2.0-2-amd64  3.2.0-4-amd64
>> 2.6.38-2-amd64  3.0.0-1-amd64   3.2.0-1-amd64  3.2.0-3-amd64
> Which one is the correct one and do the modules end up in the right
> place when you install them? We're piggybacking on the kernel's build
> system here to install the modules and the Makefile (at least the
> upstream one) uses that file to determine the location/version.

The correct one is 3.2.0-4-amd64. The module ends up in /lib/modules/3.2.0-4-amd64/extra/, which I guess is the right place.

>> so I guess "depmod `uname -r`" would be the right thing to do, which is the same as "depmod" by itself. With this the "make modules_install" seems to succeed.
> The problem is that this will only work if the kernel that you are
> building against is currently running.

OK, so you need to use the kernel version from the "with-linux" option given to configure then?
I have configured with --with-linux=/lib/modules/`uname -r`/build so that happened to work for me.


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