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Forum: Kernel

Request help with Linux kernel compilation, theory, programming, or other kernel related issues

  1. BUG: soft lockup - CPU#1 stuck for 22s

    Hi all. I've run into an issue with upgrading a xen VM host server from openSUSE 12.3 to 13.1 I'm running Bonnie++ to test the disk i/o on 6...

    Started by sputnik-1, 09-30-2015
    • Replies: 1
    • Views: 2,523
    10-02-2015 Go to last post
  2. Question [SOLVED] Unknown symbol mutex_lock_interruptible

    I'm stuck with a stange kernel error. I successfully built a wifi driver for my rtl8188eu, but it won't load: >insmod 8188eu.ko Error: could not...

    Started by JoeCool, 09-28-2015
    • Replies: 0
    • Views: 1,016
    09-28-2015 Go to last post
  3. Freeing Init memory latency issue.

    Hi All, Sorry, I posted this question in another thread but realized this is the proper place. I notice when booting up my custom kernel there...

    Started by tasdvl9, 09-22-2015
    • Replies: 0
    • Views: 1,271
    09-22-2015 Go to last post
  4. Kernel module. File operations with ttyACM.

    Hello, everyone. I need to write kernel module which will communicate with board through ttyACM. I can only write to board using it, but cannot...

    Started by ParaPik, 09-20-2015
    • Replies: 0
    • Views: 801
    09-20-2015 Go to last post
  5. spi_gpio

    Hi, I want to use SPI functionality over GPIO's after cross compilation and trying to insert the spi_gpio.ko It throwing the below error...

    Started by rajkumarmadhani, 09-11-2015
    • Replies: 0
    • Views: 1,508
    09-11-2015 Go to last post
  6. Modifying dummy audio driver snd_aloop?

    Update: as is often the way, asking the question and then checking for myself that it wasn't completely stupid, has helped clarify a few things! It's...

    Started by RichT, 06-29-2015
    • Replies: 1
    • Views: 1,261
    09-10-2015 Go to last post
  7. Two modules in the same ko - Unknown Symbol?

    Hi, I'm making an external kernel module for a device that consists of a group of range finders. I would like to define this as a driver class and...

    Started by allsey87, 07-02-2015
    • Replies: 2
    • Views: 1,516
    09-10-2015 Go to last post
  8. Some questions about preempt_disable.

    when kernel boot time , after sched_init(); then here called : preempt_disable(); and the comment for the function : 542 /* 543 ...

    Started by redosun, 08-12-2015
    • Replies: 1
    • Views: 1,529
    09-10-2015 Go to last post
  9. Stop kernel when it access a certain memory address - KGDB/GDB

    Hello together, to find an annoying bug I have to know which functions will perform a write operation to a specific memory address. To achive...

    Started by ralf8519, 08-14-2015
    • Replies: 3
    • Views: 1,907
    09-10-2015 Go to last post
  10. asynchronous io to named pipe possible?

    I'm new to linux. I'm trying to create a named pipe server and named pipe clients. Ideally I was hoping to have the server use async IO to make...

    Started by nickdu, 08-06-2015
    • Replies: 7
    • Views: 4,904
    08-07-2015 Go to last post
  11. Query about Kernel memory placement!

    I am doing some research and wanted to know what is the location of kernel in the ram. Another question: how much portion of kernel in ram gets...

    Started by mkafridi, 07-22-2015
    • Replies: 5
    • Views: 1,453
    08-05-2015 Go to last post
  12. Question Hangs when booting after soft-reset (after hard-booting to GNU/Linux)

    Hello GNU/Linux experts. This is a dual booting (GRUB 2) UEFI 64-bit laptop. If I hard-boot (shut-down the computer and turn it on manually) to...

    Started by tauro_kpo, 06-21-2015
    2 Pages
    1 2
    • Replies: 13
    • Views: 5,083
    06-23-2015 Go to last post
  13. Difference between LTP and Autotest

    Which test framework to use for kernel and peripheral testing

    Started by hobbyist, 06-08-2015
    • Replies: 0
    • Views: 1,256
    06-08-2015 Go to last post
  14. SPI transfer chip select setup time

    Hi, 1. During SPI tranfer master->transfer(spi, message) is called in function __spi_async in spi.c file. I searched the file spi.c and all...

    Started by rajkumarmadhani, 06-06-2015
    • Replies: 1
    • Views: 1,092
    06-06-2015 Go to last post
  15. configure pagecache in kernel 3.19.1

    Hi, I need to set the page cache size to zero for my experiments. At many places on the internet it is referred to as vm.pagecache, but in my system...

    Started by vasudevjakhar, 05-26-2015
    • Replies: 1
    • Views: 966
    05-28-2015 Go to last post
  16. Ethernet hang on new kernel

    Hi, After compiled new kernel 3.4 for Centos 6 I get errors like below. Last time when i want reboot server, it hang at deactivating ethernet card...

    Started by rutekp, 05-26-2015
    • Replies: 1
    • Views: 1,158
    05-27-2015 Go to last post
  17. Having trouble with Intel wifi..

    H guys, I'm trying to trim Linux-pf 4.0 down to fit my hardware, instead of using the bloated cover-all generic kernel Ubuntu uses. I'm hoping to...

    Started by ArgentWarrior, 05-22-2015
    • Replies: 1
    • Views: 999
    05-22-2015 Go to last post
  18. The workings of a USB dongle

    OK, I got a new USB dongle for my net access couple of days ago, and I'm pleased to say that all I had to do was plug it in, and Fedora 20 configured...

    Started by resetreset, 05-13-2015
    • Replies: 1
    • Views: 1,052
    05-14-2015 Go to last post
  19. Replicating ps -ef function

    Hey everyone, I am trying to create my own ps -ef function inside a linux kernel. For example, ps -ef prints all the information currently running on...

    Started by babazinga, 05-10-2015
    • Replies: 1
    • Views: 1,007
    05-11-2015 Go to last post
  20. CDC NCM driver in linux 3.19 kernel

    Hi,all I recently met a problem when use the CDC_NCM driver in Linux kernel 3.19. After successfully probed, there is no eth_open function call, so...

    Started by MQN, 05-06-2015
    • Replies: 0
    • Views: 1,466
    05-06-2015 Go to last post

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