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I am someone trying to learn linux kernel programming. I read insmod and modprobe can be used for inserting a module in to the kernel. I created a simple kernel module and tried to insert using insmod it worked well. But when I used modprobe it showed error.
[root@station121 kernel]# modprobe module1.ko
FATAL: Module module1.ko not found.
My module is a simple kernel module which just has a init_module function and a cleanup module function. I tried to insert from the path where my program and module resides.
I am using linux kernel 2.6.18 on a Centos 5 distribution. Please help me
Location: Somewhere inside 9.9 million sq. km. Canada
Distribution: Slackware 14.1
Two things, the man page says modprobe looks in /lib/modules for loadable modules. Copy your module there and give it a go. Second, in suggests the name should have '-' or '_' in the name ( without the quotes ). You could rename the module as a second thing to try.
Thanks for the reply friends. As you have said I have copied my module into /lib/modules/2.6.18-53.el5 directory. The name of my module is module1.ko . And I tried modprobe again.But it is showing the same error message. What i did wrong ?....
I think Uncle Theodore has it right with the suggestion to run "depmod -a". I believe that you have to be in /lib/modules/`uname -r`, and that your .ko file should be in the proper subdirectory under the kernel subdirectory.
Thanks .. that does work...But I still didnt under stand the part ... This time I first inserted the module using insmod...Then I run depmod -a...Then I copied the module to /lib/modules/<uname -r> directory...I then removed the module using rmmod ... Then I tried modprobe with only module name and it does work..In total this is what i did...
I think you just overlooked a step in your previous example. The steps would be:
1: put your module into /lib/modules/`uname -r`/kernel/drivers/HERE-SOMEWHERE
3: now either insmod or modprobe should work.
4: to remove the module, do "rmmod module1" or on a more modern OS, "modprobe -r module1"
FWIW, as I understand it, using modprobe does 'module dependency checking' and inserts related modules needed by the initial module, whereas 'insmod/rmmod' does not.
Also, you never need the .ko extension for modprobe.
Last edited by GrapefruiTgirl; 08-24-2009 at 12:03 AM.
Reason: EDIT: added /drivers to path --oops.