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Subject: Re: Unknown symbols in module (iio)
To:     Srishti Sharma <srishtishar@gmail.com>,
        Linux kernel mailing list <linux-kernel@vger.kernel.org>
References: <CAB3L5ow-gf0Z7NCRW1V0v+spRF553zx=J_pwc5m5YXxW4S27Lg@mail.gmail.com>
Cc:     linux-iio@vger.kernel.org
From:   Randy Dunlap <rdunlap@infradead.org>
Message-ID: <a1ceed29-158a-5ba8-6b05-cddd043baef8@infradead.org>
Date:   Sat, 17 Mar 2018 13:42:24 -0700
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[adding linux-iio mailing list]

Hi,

It's always a good idea to include the kernel version in a problem report.


On 03/05/2018 03:17 AM, Srishti Sharma wrote:
> Hello,
> I was trying to work with the iio dummy driver, and when I try to load
> the iio_dummy_evgen.ko module I am getting unknown symbols found in
> module error on running modprobe.
> 
> These variables are unknown
> iio_bus_type		>>> in industrialio-core
> irq_sim_init		>>> in iio_dummy_evgen
> irq_sim_fini		>>> same
> irq_sim_fire		>>> same
> irq_sim_fini		>>> [duplicate]

I tested this using Linux 4.16-rc5.  As long as I manually load all
modules in the needed order, they will all load with no symbol problems.


> All of these variables are present in the Module.symvers file in the
> /lib/modules/<kernel version>/build directory. The kernel and the
> modules versions match. I ran make clean, make, and make
> modules_install before trying to load them. I am unable to figure out
> the problem. Where I might be going wrong any ideas ?

Were you expecting some module autoloading based on their internal
dependencies?  If so, maybe someone on the linux-iio mailing list
could comment on that.


-- 
~Randy