using debugfs to modify module argument

sarah55 · 05-29-2017, 06:28 AM

Hi,
i'm trying to use debugfs in order to modify a module argument.
i have an argument from type integer, i want to be able to change the corresponding file in the debugfs bug i get BUG: unable to handle kernel paging request at 0000000000ece008
and the module crashes.
i think i'm doing it wrong.
can someone point me to a good example of how to create a file in debugfs for an integer value, and using this modification to change a module argument?

Thanks.

Mara · 06-01-2017, 01:14 PM

Hello,
Setting module parameters is quite easy. However, you typically do not do it by debugfs, but by sysfs.

How to do it in short:

Quote:

static int myparam = 1;
module_param(myparam, int, S_IRUGO|S_IWUSR);

You should be able to set it both when loading the module and by writing in /sys/modules/