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Questions tagged [kernel-module]

A kernel module is a run-time loadable object file that is loaded into operating system kernel to add functionality to a running kernel. Examples include device drivers and other kernel items.

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How should I set extra include path for linux kernel module build?

This is the Makefile that I'm using for cross-buildig a kernel module. export CROSS_COMPILE:=aarch64-none-linux-gnu- export ARCH:=arm64 obj-m += chr_drv_ex1.o export…
Chan Kim
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serve when is receive_buf called

Hello I wanted to know when is the receive_buf vom a serve called. Because for me it looks like it get called on a time out. But I did not find anything in the documentation. I also looked at the source code but I found nothing. serdev.h
samann
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why cant get the message response from kernel module when using netlink socket to communicate with python user

I'm using netlink socket to communicate user python code with linux kernel, i can send message properly from user to kernel but i cant get the response back from kernel. it shows: "Error while sending bak to user.." in my peice of kernel code I…
Meri
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How to provide -C option in the Makefile for cross-compiling kernel module?

I'm trying to build a simple kernel module for arm64 machine from my x86_64 machine. The target and host are both using ubuntu 20.04 as OS. First I tried building a simple kernel module for the host (x86_64) using this Makefile. By the way, uname -r…
Chan Kim
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no build/script directory in lib/modules for a WSl2 kernel

I built and configured a kernel in WSL2 (wsl-5.4.91, gcc 9.4.0, Ubuntu 18.04 WSL) While installing MLNX_OFED I get the error that there are no files in the lib/modules//build/scripts. I there an easy way to copy the scripts in there? I read this but…
Tillmann2018
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Kernel module programming - how to print the pid and the name of the process that stop by the user (like to press on "ctr+C" or "ctr+Z")?

I tried to create a function ,in my module, that every time , when the system call sys_exit is called. So it will print the pid of the process that the user tried to stop (by press ctr+C, ctr+Z or something else). asmlinkage long our_sys_exit(struct…
Jonatan Haish
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Capturing power-off interrupt for i.MX6UL (linux kernel)

Context I'm using an i.MX6 (IMXULL) application processor, and want to know in software when the power-off button has been pressed: Luckily, the IMX6ULL reference manual explains that this should be possible: Section 10.5: ONOFF Button The chip…
Micrified
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Allocating physically contiguous pages in Kernel Module

I am trying to allocate physically contiguous pages in DRAM using the alloc_pages_exact function. When I try to allocate 10MB of pages, the returned address is always 0. But when I try to allocate 1MB of pages, the allocation is almost immediate.…
jonvonton
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When does mod->init be assigned

When Linux Kernel load new module with insmod, it will invoke finit_module do_init_module do_one_initcall then the init function defined in module will be invoked. static noinline int do_init_module(struct module *mod) { int ret = 0; …
Felix Du
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Linux kernel shows "WARNING: at arch/x86/mm/pageattr.c:962 change_page_attr_set_clr" without explanation

I'm writing a x86_64 kernel module targeting Linux v3-v4 which uses set_memory_rw() on an address of a kernel symbol. While the call works I'm getting a warning without any explanation: [ 596.183643] ------------[ cut here ]------------ [ …
kiler129
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Using mmzone.h functions to build a kernel module

I am trying to make a kernel module that gives me some basic information about the memory, like nodes, zones, pages, etc. I am not able to build the module, there are some errors. I am using Ubuntu 20.04. Kernel 5.8.0-55-generic. The code is as…
jonvonton
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Toggle GPIO in Netdevice

Hy i wanted to toggle a GPIO pin always when i send a package. But I have a weird behafure sometimes my pin gets toggled and sometimes not. I checked my Kernel logs and there is no Information that the pin could not be toggled. My Ops look like…
samann
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Error build when linux kernel driver is configured as builtin

I have developed 2 kernel drivers and I can build them using yocto as dynamic kernel modules without any probem but when I need to build them as static I had some issue related to dependency, because my driver1 is used by driver2. Here is the…
developer
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Compiling kernel module without kernel headers

I am developing a kernel module and need to compile it for an older version of Gentoo that I don't have the headers for. The Linux kernel version is 4.14.34 and I have the source for that, with the output from uname -r being 4.14.34-gentoo-x64.…
RPiAwesomeness
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Modify the physical address of a v4l2_buffer in kernel module

Is it possible to modify a v4l2_buffer allocated through MMAP in userspace such that the physical address of the requested buffer points towards a desired physical memory? The goal is that we have a sensor writing data in a circular buffer within a…
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