This tag is for questions about the internals of the Linux kernel itself - particularly about use or configuration of kernel modules or drivers.

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Is system call the only way that a user program can intentionally affect the state of a Linux kernel?

I think there are several ways that a user program can intentionally affect the state of a Linux kernel. By invoking a system call; By invoking mmap() and writing the memory that has been mapped to ...
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2answers
27 views

How can I get socket information, from outside of a Linux process, on its socket?

I'm specifically interested in listening TCP sockets, but getting all and any socket (struct sock, as defined in Kernel's include/net/sock.h) information for a socket would be nice. For example, this ...
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1answer
22 views

How to compile the linux without any audio codecs?

I want "no audio" functionality in an embedded system. So, any idea about how to configure kernel without any audio? Thanks.
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0answers
8 views

Cannot start LXC container: failed creating cgroups

I am using LXC (Linux Container) 1.0.6 on a Ubuntu 14.04 64bit Virtual Machine trying to build HTTP service in a container. I have trouble starting the container: $ sudo lxc-start -n test1 lxc-start: ...
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6 views

update-grub creates a menu entry with read only option

I am trying to automate the installation of a new linux kernel across a data center. After the installation, my script runs update-grub to add an entry to the grub menu. It updates ...
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1answer
22 views

Where can I find the origin of specific modprobe conf option to erase it?

When I do modprobe -c |less The configuration files contains: options nouveau modeset=1 options bbswitch load_state=0 unload_state=1 options b43 nohwcrypt=1 qos=0 options rd md=0 options rd dm=0 ...
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0answers
27 views

BATMAN protocol

I am having problems with Batctl. I installed Batman adv and batctl on ubuntu 14.04.1. I am having problems with batctl commands. When I write comand "Batctl p 00:16:bf:01:68:46" i get this error: ...
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1answer
28 views

What could cause out_of_memory & __alloc_pages

Sadly my server is permanently hangging due to out of memory: Nov 8 07:30:43 crawler kernel: Nov 8 07:30:43 crawler kernel: Call Trace: Nov 8 07:30:43 crawler kernel: [<ffffffff800cb625>] ...
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0answers
15 views

Keyboard and mouse don't work after kexec

While installing Fedora on my MacBook Pro Mid 2012 I've occasionally used kexec command to "boot" from live environment to the installed system. # yum install kexec-tools.x86_64 # mount LABEL=/boot ...
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1answer
36 views

Patch files for Linux Kernel 2.6

I am doing some data analysis on the code base of Linux kernel version 2.6. However I noticed that in the kernel website (https://www.kernel.org/pub/linux/kernel/v2.6/) patch files are missing after ...
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0answers
30 views

Gentoo Linux: Building a kernel that only only contains drivers for the hardware in place

I would like to build a kernel for my system that only contains modules for the hardware which is really in place. Of course I can walk through lspci and manually select all the necessary device ...
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1answer
42 views

Will Linux work correctly with full root partition?

Will Linux work correctly when root partition is completely filled up? Let's say my application is running on different partition and has enough space. What about Linux kernel? Will it continue ...
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0answers
13 views

pppd retry issue with multiple wan interfaces

I am using two wan connections in my router with linux kernel 2.6.21. PPPOE Ethernet cable and 3G connection. Both need ppp setup. But boot sequence is different for both. many times 3G disconnect and ...
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1answer
31 views

Linux NTFS-3G General Protection Fault when using OS X in VirtualBox

I have an OS X virtual machine in VirtualBox on a Debian host. The disk image is located on an NTFS partition (which is not the system's root partition), mounted using NTFS-3G. The machine was ...
2
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0answers
53 views

Chipsee 7 inch LCD support in Linux kernel 3.14

Has anybody ported Chipsee 7 inch LCD on Linux kernel 3.14 or later ? Is there any patch available for the same ? If no patches any suggestion porting Chipsee LCD support from Linux kernel 3.8 to ...
2
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1answer
451 views

How do I stop rfkill module from hardblocking my wifi, without rfkill command?

I went into my BIOS the other day, didn't change anything, and rebooted. After this, my wifi was hardblocked. I looked online for solutions, and learned of the rfkill command. But I get rfkill: ...
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2answers
66 views

installing linux without any packages

I am programming a OS based on Linux but I want to "re-invent the wheel" in this OS just as an achievement. I have been told that Linux can be installed on a PC without any packages (obviously causing ...
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0answers
31 views

Switch off WIMAX/Wifi Intel 5150 chip under Linux

How switch off WIMAX/Wifi Intel 5150 chip under Linux using command or utilities? I recompile Linux kernel without WiMAX support, but indicator lights on the front panel of my notebook. P.S. Is it ...
1
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1answer
108 views

Install recent linux version in old computer?

I have tried to install several distros and versions of linux (Ubuntu and Lubuntu, from 13 to 14.04, and Mint 17) without success. Everytime the system blocks while loading the installation. I can ...
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1answer
45 views

Upgrading Linux kernel module without reboot

Is there any way to upgrade linux driver module without rebooting the system ?
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0answers
103 views

/sbin/init exists but couldn't execute it

I'm building Linux from scratch. Currently I have the kernel, glibc and sysvinit. I've compiled everything myself following these instructions. Though my version of glibc is 2.19. Also, I use grub ...
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0answers
142 views

Hide all kernel boot messages/logging when disabling splash screen Lubuntu 14.04.1

In Lubuntu 13.10 I was able to redirect the kernel messages/logging to another tty by adding the following to the Grub file in order to hide all kernel boot messages when disabling the splash screen ...
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0answers
111 views

Disable TCP keepalive on RHEL6

Is it possible to disable TCP keepalive on RHEL6? I know the kernel parameters for tuning TCP keepalive timeout are as follows: net.ipv4.tcp_keepalive_time net.ipv4.tcp_keepalive_intvl ...
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0answers
29 views

Xen E820 memory map for domU kernels

How does xen handle E820 memory map for domU kernels? In my specific problem I am trying to map Non-Volatile RAM to domU kernels. The dom0 memory map returns the following relevant parts. ...
0
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1answer
91 views

Can't load tun module in Linux

I am trying to set up a VPN connection, but OpenVPN fails with ERROR: Cannot open TUN/TAP dev /dev/net/tun: No such device (errno=19) modprobe tun has no effect, and modinfo tun shows that the ...
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2answers
2k views

Directory - /sys in linux

Can anyone explain me what is going inside the /sys directory on a Linux system? I Googled it and got some results, but I need a clear mind on this. Is there anyone ready to give me a short (and ...
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0answers
143 views

How may I mount a disk with a Apple / Mac partition table (APM) in Linux?

I've backed up some files from a old Powerbook G4 (AluBook), and I used the Mac Partion manager or whatever to first initialize the disk. It worked, originally, as one large volume, and I copied ...
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1answer
318 views

IPsec in the Linux Kernel

I have some issues (questions) related tot the Linux Kernel implementation of IPsec and it's user-space interface. The biggest question is which is the actual official project for the Linux Kernel ...
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0answers
7 views

How to install cached linux debug symbols?

I am doing work which requires downloading and installing debug symbols multiple times for a specific linux kernel i.e: linux-image-3.8.0-26-generic-dbgsym I'm on a fast university fiber network. ...
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0answers
235 views

What is the exact difference between the parameters (pgpgin, pswpin) and (pswpout, pgpgout) in /proc/vmstat?

Please note that this question is specific to linux only. And by swap space, I mean the dedicated swap partition. I did google a bit on this, and found these definitions: Paging refers to writing ...
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0answers
65 views

unable to find a suitable fs

I am trying to install edx on a virtual machine. But i am getting problem with apparrmor.When i run command. $ apparmor_parser Warning: unable to find a suitable fs in /proc/mounts, is it ...
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0answers
23 views

Is ramdisk_size still needed with a .cpio initrd?

I'm creating a rescue system with the following two files: rescue.linux (version 3.2) initrd.cpio The initrd.cpio file can be quite large, larger than the default 4MB of a ramdisk. However, it ...
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26 views

kernel configuration: select specific drivers or symbols regardless of dependencies?

Is there a way in "make menuconfig" et al. to start with enabling device drivers that you want included, and have it enable the necessary (dependent) generic options and APIs automatically? As it is, ...
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0answers
25 views

Virtual machines on Secure Boot

I have Fedora 20 installed with Secure Boot. I've been trying to make a virtual machine using OracleVM VirtualBox and VMware Workstation, but none of them work (vmmon couldn't be started). After ...
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1answer
93 views

CONFIG_CMDLINE_OVERRIDE set but hardcoded vga-boot-parameter ignored?

I have build a custom linux kernel with the options: ... CONFIG_CMDLINE_BOOL=y CONFIG_CMDLINE_OVERRIDE=y CONFIG_CMDLINE="initrd=linux_os.gz root=/dev/ram0 init=/sbin/init ramdisk_size=25600 ...
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1answer
1k views

dkms does not find kernel source

For days now I am trying to get ZFS-on-Linux working on Debian 7 but the module doesn't want to compile: # dpkg-reconfigure zfs-dkms ------------------------------ Deleting module version: 0.6.3 ...
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0answers
23 views

How to disable USB Mouse only

I was developing a device driver for a USB mouse which uses the USB HID driver. The problem is that I cannot test out my module as Linux takes over the mouse directly. So how do I find out which ...
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0answers
39 views

What HID/Module does Air mouse use in Linux?

I was thinking about developing a module for running a Air Mouse. I am not sure as what module s used to carry out the operation done by air mouse. Is it under HID? (I am talking about a wireless Air ...
0
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1answer
80 views

How to rewrite ACPI control tables from Linux?

I have a HP Probook 4720s laptop with broken ACPI tables. The fan is always switched off and the computer tends to overheat and shut down. Under Windows I can use a program called RW_Everything to ...
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2answers
88 views

Why does the /dev directory exist?

In Linux, there is the /dev directory, which is a special directory which contains all of the files for devices and other things like random, urandom, etc. Why did this directory exist? Was it just ...
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0answers
40 views

Acpitool no information

When I run as root acpitool I recieved Battery is not present, bailing out. AC adapter : <info not available> Thermal info : <not available> I can understand why all the ...
0
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0answers
53 views

What is the difference between cat and normal file operations on proc files

I have implemented a ps like utility module for procfs which extracts basic information such as command, pid, tgid etc. I have used the sequence file approach. I am inspecting my proc file using two ...
0
votes
1answer
241 views

NO <DUTY, RUN, PERIOD, POLARITY> in bone_capemgr.9(ocp.2/pwm_test_P8_13.#)FILE Beaglebone Black

I just a fresher did the servo test with my BBB, however, when I use some command as ...
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0answers
106 views

How to install kernel 3.9 in Debian Jessie from repos?

I was wondering if it is possible to install kernel 3.9 in Debian Jessie from repos. A brief check shows that there are only 2.6, 3.2 and 3.13 kernels in repos Compiling my own kernel is the last ...
0
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1answer
66 views

How to add code into the linux kernel?

I am studying how to analyse and evaluate the TCP/IP protocol stack of Linux. My goal is to study the performance of the tcp/ip protocol stack as a whole, to study the time cost of each layer and ...
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0answers
29 views

How can I to update the kernel in my network NAS from Conceptronic: CH3SNAS (same as D-Link DNS-323)?

I have installed Fun_Plug (up to v0.7) and using it for years in my CH3SNAS, following instructions from Uli's web site, but even when the site has new kernel modules for download, I have not been ...
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1answer
285 views

Error in kernel 2.6.32 compilation and stable kernel 2.6.32 source needed for customization

I am using Ubuntu 10.04 LTS with kernel 2.6.32-21-generic , and Ubuntu 10.04.4 LTS with kernel 2.6.32-38-generic. While I am trying to compile the source for both kernel version - 2.6.32-21-generic ...
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1answer
832 views

linux; return “RTNETLINK answers: Operation not supported” for dummy interface creation

I am trying to create a L3 interface in kernel v3.4.34, that is not attached to a physical interface/device and this is to be used purely as a management interface as an externally visible interface ...
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1answer
71 views

Minimal OS with less background process [closed]

I am currently doing experiments on L1/L2/L3 cache. Measurement of L1/L2/L3 cache access time fully depends on where is my current data present, and that also depends on background process of OS ...
0
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1answer
794 views

Not enough host controller resources for new device state

I have a debian mint based system where I plug in 16 usb devices. The Kernal is: 3.11.0-12-generic After about 10 or so devices I start to experience problems with connecting new ones. There error ...