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Honestly, I just have no idea. Any suggestions?
That's the code: (it's basically the hello-world-module from the Linux Device Drivers book)
1 #include <linux/init.h>
2 #include <linux/module.h>
3 MODULE_LICENSE("GPL");
4
5 static int hello_init(void)
6 {
7 printk(KERN_ALERT "exit: %p\n", THIS_MODULE->exit);
8 return 0;
9 }
10
11 static void hello_exit(void)
12 {
13 printk(KERN_ALERT "Goodbye, cruel world\n");
14 }
15
16 module_init(hello_init);
17 module_exit(hello_exit);
And here's what I did:
benno@benno-desktop:/media/disk/sources/kernel/modules/hello$ make
make -C /media/disk/sources/kernel/linux-2.6 M=/media/disk/sources/kernel/modules/hello modules
make[1]: Entering directory `/media/disk/sources/kernel/linux-2.6'
CC [M] /media/disk/sources/kernel/modules/hello/hello3.o
Building modules, stage 2.
MODPOST 1 modules
CC /media/disk/sources/kernel/modules/hello/hello3.mod.o
LD [M] /media/disk/sources/kernel/modules/hello/hello3.ko
make[1]: Leaving directory `/media/disk/sources/kernel/linux-2.6'
benno@benno-desktop:/media/disk/sources/kernel/modules/hello$ sudo insmod ./hello3.ko
[sudo] password for benno:
benno@benno-desktop:/media/disk/sources/kernel/modules/hello$ sudo rmmod hello3
ERROR: Removing 'hello3': Device or resource busy
benno@benno-desktop:/media/disk/sources/kernel/modules/hello$ lsmod | grep hello3
hello3 2304 0 [permanent]
benno@benno-desktop:/media/disk/sources/kernel/modules/hello$ dmesg | grep exit:
[13131.090187] exit: e0b3e000
benno@benno-desktop:/media/disk/sources/kernel/modules/hello$ uname -r
2.6.28-rc9benno-stripped
benno@benno-desktop:/media/disk/sources/kernel/modules/hello$ grep CONFIG_MODULE_UNLOAD /boot/config-2.6.28-rc9benno-stripped
CONFIG_MODULE_UNLOAD=y
So, any ideas what could be causing this? Am I missing something?
set CONFIG_MODULE_UNLOAD=y
Most likely you have not set
CONFIG_MODULE_UNLOAD=y in your
.config file. There's nothing wrong
with your module but you have module
unloading not configured in. look
at the kernel config file.
coop
Probably I should have this
Probably I should have said this explicitly, but CONFIG_MODULE_UNLOAD is set. (at least according to my config-file, see the last two lines of the original post)
Is the the config file of the running kernel?
Hi Ho!
There is a possibility that the config file is not that of the running kernel.
It is much better if you can do `zgrep CONFIG_MODULE_UNLOAD /proc/config.gz'.
Best regards,
Eus (FSF member #4445)
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I had to recompile my kernel
I had to recompile my kernel to get /proc/config.gz and now module unloading works again, so i guess CONFIG_MODULE_UNLOAD really wasn't set. (though i have no idea why a wrong config file had been generated)
Thank you all!