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Forum: Kernel

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

  1. switch_root with systemd: "Too many levels of symbolic links"

    I'm trying to boot a proprietary kernel build and OS after an upgrade to libc and numerous other tools. I'm booting using an initramfs in the 3.2.0...

    Started by Gatica, 04-07-2016
    • Replies: 3
    • Views: 2,043
    05-18-2016 Go to last post
  2. What's the exact purpose of synchronize_net function?

    Can anybody please tell me, what exactly does synchronize_net() function do in LINUX? More specifically, what's the effect of this function if I run...

    Started by Mark1981, 04-30-2016
    • Replies: 1
    • Views: 1,168
    05-18-2016 Go to last post
  3. Question To const, or not to const?

    Hi, I have a quick/trivial C question and hope the kernel developers don't mind sharing their opinions: Is the use of the const qualifier for...

    Started by hansonchar, 05-11-2016
    • Replies: 1
    • Views: 1,127
    05-11-2016 Go to last post
  4. Question Force power on state after resume

    Hello, I'm working on embedded Linux for Amlogic ARMv8 platform (3.14.y kernel). Kernel itself is 'android' kernel. I'm having problems...

    Started by Stane1983, 03-22-2016
    • Replies: 2
    • Views: 1,260
    03-25-2016 Go to last post
  5. Direct syscall of process_vm_readv returns ENOSYS in 3.14 kernel

    Hi, I need to use process_vm_readv/process_vm_writev in my product (why is beyond the scope of this thread) and these system calls are returning...

    Started by meyery, 03-24-2016
    • Replies: 1
    • Views: 1,026
    03-24-2016 Go to last post
  6. Kernel threads vs. user threads implementation (kthreads vs. pthreads)

    I am cross posting this from Stack Overflow to see if anyone can explain this to me. The post was rather long so I'll just post an excerpt and put...

    Started by cybershark5886, 01-23-2016
    • Replies: 1
    • Views: 3,378
    02-07-2016 Go to last post
  7. deleting a big file on "ext3" takes a long time

    The partition where I keep movies is formatted with "ext3". I noticed many times that deleting a file of size > 10 GB takes from 10 to 100 seconds. I...

    Started by beroal, 01-19-2016
    • Replies: 1
    • Views: 953
    01-20-2016 Go to last post
  8. Explore btrfs with UML

    Hi, I want to explore (debug) Btrfs with UML so I compile UML from source code linux 4.3 with btrfs enable. Then I try to run ddd (gdb) with UML...

    Started by nguyentl, 12-14-2015
    • Replies: 2
    • Views: 1,693
    01-07-2016 Go to last post
  9. Talking Mapping a i2c register as memory in BBB Issue

    Hi I am using beagle bone black and writing i2c driver just for learning. I used am335x TRM and i2c1 at address 0x4802a000 as mentioned in TRM....

    Started by Elduderini, 12-13-2015
    • Replies: 9
    • Views: 2,217
    12-25-2015 Go to last post
  10. Kernel selection

    I never much cared what kernel I ran as long as my hardware worked. As of late though it has become a concern. I have an HP laptop with AMD A10 and...

    Started by NGIB, 11-29-2015
    • Replies: 2
    • Views: 1,555
    12-17-2015 Go to last post
  11. Post Windriver Linux as Smartcore9100 wimax asn-gateway kernel...

    Dear readers, I hope my post finds you all O.K., I have a WiChorus Smartcore 9100 Series "9160" , it is a Wimax asn-gateway, with a built in...

    Started by Sharista, 12-09-2015
    • Replies: 2
    • Views: 1,486
    12-16-2015 Go to last post
  12. Implementing a driver for persistent RAM

    Hello guys, I'm having a problem which I was not able to solve on my own. I'm working for a German university and we are doing research on...

    Started by lin_phil, 12-01-2015
    • Replies: 2
    • Views: 1,649
    12-07-2015 Go to last post
  13. TCP reassembly code in the linux kernel

    Hi, Where can I find the TCP reassembly/GRO code in the kernel? I wand to play with this feature. i.e, disable/enable it and check how the TCP...

    Started by amiryo, 12-03-2015
    • Replies: 2
    • Views: 1,631
    12-05-2015 Go to last post
  14. Dutycycle variation in PWM driver

    Hi I am having pwm driver for constant dutycyle.. i need to vary the dutycyle 0 to 100% in driver. I am using omap tdm 3730 processor. for my...

    Started by rajipriya, 11-27-2015
    • Replies: 0
    • Views: 866
    11-27-2015 Go to last post
  15. Question Question about IPv4 packet checking in br_nf_pre_routing()

    Hi, I am working on Linux bridge netfilter. And to meet the customer a special request, I would need to remove the pskb_trim_rcsum() in bridge...

    Started by alancc_wu, 11-24-2015
    • Replies: 0
    • Views: 694
    11-24-2015 Go to last post
  16. Question Linux Kernel CPU Usage ( HOW TO )

    Hey all what is the most effective way to measure cpu usage in linux kernel !?

    Started by salihboshnak, 11-15-2015
    • Replies: 1
    • Views: 1,435
    11-18-2015 Go to last post
  17. Question How to undo a mistake while compiling device driver?

    I was trying to get my first Hello World device driver program to compile. First, I compiled a stable Linux kernel, booted it via GRUB, and then...

    Started by piperforum, 10-26-2015
    • Replies: 1
    • Views: 1,041
    10-27-2015 Go to last post
  18. systemd-nspawn overlay error: sys read-only: Invalid argument

    I am trying to leverage the --overlay command from the new systemd-nspawn tool but I cannot seem to get it working. My current scheme (what I want...

    Started by critikull, 10-21-2015
    • Replies: 0
    • Views: 1,151
    10-21-2015 Go to last post
  19. Interrupt Handler issue

    Hi , I'm trying to write a kernel module driver for my device which is connect through pcie switch .I have registered the interrupt using...

    Started by vidya, 10-13-2015
    • Replies: 0
    • Views: 1,369
    10-13-2015 Go to last post
  20. How can do tcp socket migration?

    Hello, Dear all, I am a M.Sc CE student, and My thesis is about server load balancing using SDN. I am very much Obligated to you if answer my...

    Started by hqasemi, 10-03-2015
    • Replies: 1
    • Views: 1,545
    10-10-2015 Go to last post

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