On Sun, Mar 19, 2017 at 6:53 PM, Alexander Kapshuk
[off-list ref] wrote:

On Sun, Mar 19, 2017 at 10:53 AM, SIMRAN SINGHAL
[off-list ref] wrote:

quoted

# modinfo iio_dummy_evgen.ko
filename:
/home/simran/git/kernels/staging/drivers/iio/dummy/iio_dummy_evgen.ko
license:        GPL v2
description:    IIO dummy driver
author:         Jonathan Cameron [off-list ref]
srcversion:     A8AC238EC07833E018CAF7B
depends:        industrialio
intree:         Y
vermagic:       4.11.0-rc1+ SMP mod_unload modversions


$ uname -r
4.10.0-rc3+

So, this shows that I need to compile module iio_dummy_evgen.ko for
kernel version 4.11.0-rc1, so for this I need to build system and
source tree for this version.

So, I am trying this:-
 make -C /lib/modules/4.11.0-rc1+/build M=drivers/iio/dummy/ iio_dummy_evgen.ko

But I don't know why I am getting this error:-
make: Entering directory '/home/simran/git/kernels/staging'
make[1]: *** No rule to make target 'iio_dummy_evgen.o'.  Stop.
Makefile:1664: recipe for target 'iio_dummy_evgen.ko' failed
make: *** [iio_dummy_evgen.ko] Error 2
make: Leaving directory '/home/simran/git/kernels/staging'


On Tue, Mar 14, 2017 at 12:19 AM,  [off-list ref] wrote:

quoted

On Mon, 13 Mar 2017 15:38:07 +0530, SIMRAN SINGHAL said:

quoted

quoted

quoted

# modinfo iio_dummy_evgen.ko
filename:

quoted

quoted

quoted

vermagic:       4.11.0-rc1+ SMP mod_unload modversions


$ uname -r
4.10.0-rc3+

quoted

Greg, I got that I have to build the module against the kernel I am using.
But, How can I do this?

You can do this in two different ways:

1) You're running a 4.10.0-rc3+ kernel.  Get the matching 4.10.0-rc3+ source
tree and build the module against that.

2) You built the module from a 4.11.0-rc1+ tree.  Build a kernel from that tree,
boot that, and then try to load the module.

You're running 4.10.0-rc3+.
Your module is 4.11.0-rc1+.
The command line you supplied shows you attempting to recompile your
module for 4.11.0-rc1+. Your module is already 4.11.0-rc1+.
As has been pointed out before, you need to either:
(a). recompile your module for 4.10.0-rc3+.
(b). or, install and boot into kernel 4.11.0-rc1+, and then try
loading your module.

As a side note, what kernel tree are you developing your driver
against?

staging-testing

The location of your staging drivers directory seems
different from Linus' tree:
ls -ld torvalds/drivers/staging/iio/
drwxr-xr-x 14 sasha sasha 4096 Feb 13 21:24 torvalds/drivers/staging/iio/

Finally, please do not top-post.

Sorry for this.