sysfs entry is not created for the module parameter of loadable kernel module

Hi,
I'm using the kernel image from Linus mainline and the rootfs generated from the buildroot. Also, I have added my module in the "buildroot/package/mymodule".
In the source file of "mymodule", have added the module parameter as mentioned below :
module_param(m_Argument, int, S_IRUSR | S_IWUSR);

This module parameter is not created in the sysfs.
But I'm able to load the module with the argument but I would like to see the entry in sysfs as well.

Can anyone please check this and let me know the suggestion ?

Build steps are as below :

• Built the rootfs from buildroot
• Added "mymodule" and then again built the rootfs (this time it was incremental build)

Thank you.