On Tue, Feb 26, 2019 at 11:59 AM wuzhouhui wrote:
>
> Hi,
>
> The documentation of jprobe says that we must call jprobe_return()
> before return. I'm wondering what if we don't call jprobe_return, and
> could we use it to skip probed function?
Hi,
Please keep in mind the jprobe is likely to be r
On Wed, Jul 25, 2018 at 1:25 PM, chandrasekhar wrote:
> Hi,
>
>
>
> Are there any kernel API's for ADC. I am using NXP IMX6UL processor. I have
> to read ADC values in kernel space instead of sysfs/userspace.
It depends on the type of driver used. Either input or IIO.
The sysfs interface for IIO
Hi,
You can have a look at our Linux kernel labs:
https://linux-kernel-labs.github.io/master/
For example, start with a short introduction to Linux kernel:
https://linux-kernel-labs.github.io/master/labs/introduction.html
then create a simple kernel module:
https://linux-kernel-labs.github.io
Sure, you can do that. Nice to see that you are using Diolan DLN-2 adapter.
thanks,
Daniel.
On Mon, Apr 2, 2018 at 8:06 PM, Gaston Gonzalez wrote:
> Hi,
>
> I'm testing an AD7746 eval board using a Diolan DLN-2 adapter. I wrote
> some basic notes about the installation an instanciation process f
Hi all,
The Linux kernel labs documentation is a collection of "labs" for
various device driver topics. For each topic there are two parts: a
walk-through which explain the basic concepts and a hands-on part which
contains a few exercises.
The kernel labs are integrated with Linux kernel Document
Hi,
On Sun, Mar 26, 2017 at 9:51 PM, SIMRAN SINGHAL
wrote:
> On Sun, Mar 26, 2017 at 1:47 PM, Jonathan Cameron
> wrote:
>> Insmod will not pick up dependencies in the same way modprobe will.
>>
>> Make sure to also insmod industrialio.ko and iio-sw-trigger.ko before the sw
>> trigger module. I
On Tue, Oct 4, 2016 at 4:08 AM, Robert P. J. Day wrote:
> On Sun, 2 Oct 2016, Daniel Baluta wrote:
>
>> On Sun, Oct 2, 2016 at 2:54 PM, Shyam Saini wrote:
>> > Hi everyone,
>> >
>> > I'm final year computer science undergraduate student. I want to do
On Mon, Oct 3, 2016 at 12:48 PM, shyam wrote:
> Thanks a lot for your reply,
> I'ld like attend your session but right now I'm in India. So, couldn't
> manage everything so early to attend linuxCon Europe.
>
> Apart from this thing,
> I'ld like to work on lguest to port it on x86_64 architecture.
On Sun, Oct 2, 2016 at 2:54 PM, Shyam Saini wrote:
> Hi everyone,
>
> I'm final year computer science undergraduate student. I want to do my
> major project based on linux kernel.
>
> Would you please suggest me some areas in the kernel which have some
> projects. To be more specific, I want know
On Mon, Aug 1, 2016 at 10:26 PM, Ran Shalit wrote:
> Hello,
>
> I am writing ethernet network driver.
> I would like to ask if there are any steps which can help when
> debugging ethernet driver, or is it that the first test should already
> involve transmit/recieve packets to/from ip stack ?
>
>
On Mon, Jul 18, 2016 at 1:49 AM, Alexander Couzens wrote:
> Hi,
>
> I would like to push patches from somebody else upstream.
> I'm talking of commits of the TI's beagleboard repo [1].
>
> What do I need to take care of?
Well, basically apply the patch from beagleboard repo into your repo. This
w
On Mon, Jun 13, 2016 at 5:43 PM, ty armour wrote:
> I need tutorials on kernel development. And on complete operating system
> development. I would prefer them to be in assembly because it is faster, but
> it seriously needs to get done.
>
> If you are interested, simply post all of the tutorials
On Wed, Jun 1, 2016 at 12:05 AM, wrote:
> From: Johannes Thoma
>
> The HC-SR04 is an ultrasonic distance sensor attached to two GPIO
> pins. The driver based on Industrial I/O (iio) subsystem and is
> controlled via configfs and sysfs. It supports an (in theory) unlimited
> number of HC-SR04 dev
On Wed, Jun 1, 2016 at 5:26 PM, Munagala Naresh
wrote:
> Thanks for the response.
>
> From the "cat /proc/devices", I could see "iio" listed like this.
>
> / # cat /proc/devices
> cat /proc/devices
> Character devices:
> 1 mem
> 4 /dev/vc/0
> 4 tty
> 5 /dev/tty
> 5 /dev/console
> 5 /de
On Fri, May 20, 2016 at 7:35 AM, Ani Sinha wrote:
> Hi guys :
>
> I am seeing this weird issue where even though my original kernel
> configuration tries to build HWMON as a module, when I do 'make
> oldconfig', it forces HWMON to be built into the kernel. Is there
> anyway I can find what configu
On Sun, May 22, 2016 at 2:29 PM, Tobin Harding wrote:
> Workflow -
>
> $ git format-patch -s -1
>
> add patch comment then
>
> $ git send-email
>
> Question please -
>
> Who should the email be sent to without having a 'To' address repeated in the
> CC
> field generated by `git send-email`.
>
> T
On Thu, May 19, 2016 at 9:07 PM, Daniel. wrote:
> What is the preferred way to ident if statement when the condition
> spams to multiple lines, ex:
>
> if (cond1 &&
> cond2 &&
> cond3) {
> ...
> ...
> }
^ this one is preferred.
>
> or
>
> if (cond1 &&
> cond2 &&
>
On Tue, May 10, 2016 at 12:26 PM, Robert Clove wrote:
> Hi,
>
> I am looking for some with whom i can discuss my mac kernel problems.
> If you know someone please mail me .
Hi,
It doesn't work this way. Please describe your problem here.
What is the issue and how did you try to fix it?
Daniel.
On Sat, Apr 30, 2016 at 6:10 PM, Martin Kepplinger wrote:
> Am 2016-04-27 um 13:51 schrieb Daniel Baluta:
>> On Wed, Apr 27, 2016 at 2:36 PM, Martin Kepplinger wrote:
>>> Hi roberta or anyone who uses a diolan i2c/spi bridge device,
>>>
>>> I try to do get
On Wed, Apr 27, 2016 at 2:36 PM, Martin Kepplinger wrote:
> Hi roberta or anyone who uses a diolan i2c/spi bridge device,
>
> I try to do get the kernel driver for the connected chip loaded, but I'm
> having some trouble getting it right.
>
> Cables are connected to the device (i2c), and the (main
On Thu, Mar 24, 2016 at 5:02 PM, Johannes Thoma
wrote:
> From 56e8f71c990b92c28a8cb03d859880eab8d06a3d Mon Sep 17 00:00:00 2001
> From: Johannes Thoma
> Date: Mon, 21 Mar 2016 22:11:01 +0100
> Subject: [PATCH] HC-SRO4 ultrasonic distance sensor driver
>
> The HC-SRO4 is an ultrasonic distance se
On Thu, Dec 3, 2015 at 8:14 PM, Matwey V. Kornilov
wrote:
> Hello,
>
> I have the following stack trace:
>
> [ 1351.381696] a.out S c0afb050 0 1676 1658 0x
> [ 1351.387048] [] (__schedule) from []
> (schedule+0x58/0xcc)
> [ 1351.392436] [] (schedule) from []
> (tty_port_bl
On Tue, Nov 17, 2015 at 7:10 AM, 윤영석 wrote:
>
> hi,
> i want to use a script in kernel, but i can't use this.
> in my terminal.
> yoon@pc:~/project/aosp/kernel/linux/scripts$ ./checkpatch.pl sortextable.c
> Must be run from the top-level dir. of a kernel tree
Hi,
You can try ./checkpatch.pl -f -
On Mon, Nov 2, 2015 at 2:02 PM, Shiyao Ma wrote:
> Hi,
>
>
> Say I am writing a module. Instead of directly compile it into a ko file,
> I'd like to see the preprocessed output of that file, similarly the way it's
> done in gcc -E.
Use make V=1 path/to/your/module.ko
and see the exact gcc comman
On Sat, Sep 19, 2015 at 9:29 PM, Gunjan Mehta wrote:
> Hi,
>
> I am working on a project, where i print my log messages in
> /var/log/log/syslog like
>
> project_my:info::project started
> project_my:debug::value of a is 1
>
> i want to redirect project_my:info messages in info.txt file and
> proj
On Thu, Sep 17, 2015 at 7:56 AM, GanesH AvacharE
wrote:
> if I have to start with the basics of the OS then what sequence should I
> follow?
You can start with Operating Systems Concepts book.
http://www.amazon.com/Operating-System-Concepts-Abraham-Silberschatz/dp/0470128720
___
On Fri, Aug 21, 2015 at 10:25 AM, ravi ranjan Mishra
wrote:
> Hi,
>
> Just for learning purpose , i need to compile the sample directory in
> mainline kernel .
> can anybody tell to how build samples directory through make.
Use:
$ make menuconfig,
to select CONFIG_SAMPLES=y, then
in the root of
On Mon, Aug 3, 2015 at 6:35 AM, Nan Xiao wrote:
> Hi all,
>
> I am just wondering whether there is a script/tool which format source code
> according to kernel coding rule automatically? Such as tab, space, brace,
> etc.
Try scripts/Lindent from the kernel source tree.
Daniel.
On Sun, Aug 2, 2015 at 8:01 AM, Navy Cheng wrote:
> Hi,
> I use emacs and tags to read kernel source. The tags is create by
>
> make tags
>
> in the kernel source tree. When I want to find a struct's defination,
> something goes wrong. For example: when I find *dentry* , the first
> result is:
On Thu, Jul 2, 2015 at 2:53 PM, s.rawat wrote:
> On Thu, Jul 2, 2015 at 4:13 PM, Daniel Baluta wrote:
>>
>> * accel - m/s^2
>> * gyro - rad/s
>> * magneto - Gaus
>
> I get the data as below :
>
> in_accel_x 71000 71000.0 in_accel_y -45000 -45000.0 in_accel
On Thu, Jul 2, 2015 at 10:46 AM, s.rawat wrote:
> Hi,
> What are the unit in which the generic_buffer.c application gives the
> accelerometer , Gyro and Magnetometer values.
> Thanks in advance !
Hi,
Look for process_scan function in generic_buffer.c. It says:
process_scan() - print out the valu
On Wed, Jun 24, 2015 at 7:49 AM, Mayur Patil wrote:
> Hi All,
>
>I am conducting one workshop at FUDCon in which I am trying to teach how
> to write
>
> and send your first linux kernel device driver. Could please suggest me the
> place where I
>
> can guide the students to send the device dri
On Sun, May 3, 2015 at 8:11 PM, Lewis Clark wrote:
> I would really like to know how you guys do your kernel development.
> What distro do you use and whats the process?
>
> I’m very comfortable with debian, but i’ve heard it’s not the easiest distro
> to build kernels for as you need to build to
On Sun, Apr 19, 2015 at 11:36 AM, yoma sophian wrote:
> hi all:
> I found in alloc_bootmem_bdata, kmem_cache_alloc, kmalloc, vmalloc,
> they will call kmemleak_alloc.
>
> Would anyone know why we have to do so for calling kmemleak_alloc at
> different places?
AFAIK this is used for accounting all
On Tue, Mar 24, 2015 at 3:34 AM, Freeman Zhang
wrote:
> Hi phil,
>
> Thanks for your reply! I googled timer, it might be a solution except
> that interval granularity is a little bit large. This device is for high
> performance network. I'm not sure whether the missmatch will cause problem.
Googl
On Mon, Mar 23, 2015 at 7:27 AM, s.rawat wrote:
> I have two system having different kernel version and drivers(IIO) on which
> i can run the generic_buffer.c application .On one system it works fine but
> on the other it does not give the input reports data.
What kernel versions are you using? W
On Mon, Mar 23, 2015 at 2:18 PM, Milton Krutt wrote:
> Hi.
> It is known that no semaphore synchronization should be
> used inside an interrupt handler.
>
> Anyway, I am looking at a freeBSD device driver (written by
> a profesionist) and there are semaphores inside an interrupt
> handler's subrou
On Fri, Mar 13, 2015 at 5:33 PM, Nicholas Mc Guire wrote:
> On Fri, 13 Mar 2015, Daniel Baluta wrote:
>
>> On Fri, Mar 13, 2015 at 3:47 PM, Nicholas Mc Guire wrote:
>> > On Fri, 13 Mar 2015, Nicholas Mc Guire wrote:
>> >
>> >> On Fri, 13 Mar 2015, pal
On Fri, Mar 13, 2015 at 3:47 PM, Nicholas Mc Guire wrote:
> On Fri, 13 Mar 2015, Nicholas Mc Guire wrote:
>
>> On Fri, 13 Mar 2015, palik imre wrote:
>>
>> > On Friday, 13 March 2015, 13:43, Nicholas Mc Guire
>> > wrote:
>> > > On Fri, 13 Mar 2015, palik imre wrote:
>> > >
>> > >
>> > > > Sorry
+ linux-iio list.
On Thu, Feb 26, 2015 at 8:04 AM, s.rawat wrote:
> I have modified the hid-sensor-accel_3d.c driver to add the custom fields -
> CHANNEL_SCAN_DATA_MOTION and HID_USAGE_SENSOR_DATA_CUSTOM_VALUEX ( X =
> 2,3,4).
> Below are my modifications :
>
> enum accel_3d_channel {
> CHANNEL_S
On Fri, Nov 21, 2014 at 3:16 PM, Sunil Shahu wrote:
> Hello,
>
> I am looking into platform driver and devices and understood HOW platform
> driver's probe is called from kernel doc and following forum.
> http://comments.gmane.org/gmane.linux.kernel.kernelnewbies/37050
>
> For further information
On Tue, Aug 19, 2014 at 6:38 PM, Loris Degioanni wrote:
> (resending making sure this is not part of another thread)
>
> I'm looking for an efficient way to determine the type of an fd (file,
> socket...) given its number, from a kernel module.
> The closest thing I found by looking at the kernel
> It's there any solution to this issue?
>
> I'm using mutt, It's ok.
Hi,
Evolution works for me.
thanks,
Daniel.
___
Kernelnewbies mailing list
Kernelnewbies@kernelnewbies.org
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
On Mon, Dec 23, 2013 at 8:05 AM, Fred Chou wrote:
> Hi,
>
> I was studying the Linux wireless subsystem code and noticed this code (in
> ieee80211_rx_handlers):
>
> It first defines the macro:
>
> #define CALL_RXH(rxh) \
> do {\
> res = rxh(rx); \
On Tue, Dec 3, 2013 at 4:20 PM, Bernd Petrovitsch
wrote:
> On Die, 2013-12-03 at 08:38 -0500, valdis.kletni...@vt.edu wrote:
>> On Tue, 03 Dec 2013 20:35:41 +0800, said:
>> > For debugging purpose, I want something like 'getchar()' that can pause
>> > execution in the module code. Do any candidat
On Tue, Dec 3, 2013 at 2:35 PM, 乃宏周 wrote:
> For debugging purpose, I want something like 'getchar()' that can pause
> execution in the module code. Do any candidates I can choose?
No.
___
Kernelnewbies mailing list
Kernelnewbies@kernelnewbies.org
http
On Fri, Nov 15, 2013 at 6:24 PM, Paul Davies C wrote:
> Hi,
> I happen to find this code snippet in the kernel source :
>
> struct mm_struct *mm=current->mm;
>
> /* some other code */
>
> if(mm){ /*<==Why is this here? */
> /*read the contents by locking*/
> }
>
> The i
On Mon, May 13, 2013 at 10:51 AM, Kevin Wilson wrote:
> Hello,
> I have a question about git patches.
> When I run
> git log include/linux/skbuff.h
> and page down till the end, I reach
> 1da177e Linux-2.6.12-rc2
>
> (I do it on the net-next tree.)
>
> git show 1da177e gives:
> Author: Linus Torva
On Wed, Dec 19, 2012 at 10:36 AM, Kevin Wilson wrote:
> Hello,kernelnewbies
>
> I am trying to develop a misc driver in 3.7.0 kernel.
>
> As a basis I copy and paste this code, *without any change*,
>
> http://virtlog.com/2008/03/25/linux-miscdevice-sample/
>
> And build it.
> after insmod I have
On Thu, Dec 13, 2012 at 5:17 AM, horse_rivers wrote:
> is there method for doing this work? take kernel data to user?
Check copy_to_user [1].
thanks,
Daniel.
[1] http://lxr.linux.no/#linux+v3.7/arch/x86/lib/usercopy_32.c#L715
___
Kernelnewbies mailin
On Sun, Sep 9, 2012 at 12:16 PM, Kaushal Shriyan
wrote:
> On Sun, Sep 9, 2012 at 9:02 AM, Alexandru Juncu wrote:
>> On 9 September 2012 06:15, Kaushal Shriyan wrote:
>>> Hi,
>>>
>>> I am interested to contribute to linux kernel development process. I
>>> have been working on Linux for the last t
On Thu, Apr 26, 2012 at 10:33 AM, Rishi Agrawal
wrote:
> Hi All,
>
> I have a kernel module which has functions which take a lot of time in
> execution. I am curious to know how can I profile it, and find out the
> functions taking most of the time.
>
> I saw Oprofile, but it seems that I will hav
On Mon, Mar 5, 2012 at 11:00 AM, trisha yad wrote:
> Hi All,
>
> I am going through below topic http://patches.linaro.org/6833/. I
> could not got the meaning of slacks. Why I need this ..
> Is there some real example of need of slacks.
Have you tried searching for it? :D [1].
thanks,
Daniel.
[
On Sun, Feb 26, 2012 at 7:08 PM, Arokux B. wrote:
> Dear all,
>
> I have the following problem. Some functionality can be either built
> into the kernel or it can be build as a module. In the latter case the
> application should load the module.
>
> Is there a general approach to test if specific
On Sat, Feb 11, 2012 at 9:05 AM, chromaticwt zac wrote:
> what is the proper way to cross compile the linux kernel from one arch to
> another? specifically,
> i386 -> ppc.
You should use a cross-compiler. I recommend you crosstool-ng.
Use google for references. [1]
thanks,
Daniel.
[1]
http://f
On Sun, Feb 5, 2012 at 11:07 PM, Surenkumar Nihalani wrote:
> Hello Guys,
>
> I am CS student trying to write a kernel module as a part of my class
> assignment. I wanted to know, from within kernel, how do I read and write
> data to my proc file?
> I need to store state from last call of my funct
On Sun, Feb 5, 2012 at 11:00 PM, kashyap gada wrote:
> Hello Linux Newbies, I'm one too. I was looking out for some clean up work
> and I ran the checkpatch.pl script. I came across a file with some 400
> errors and 200 warnings. Now there were bunch of 80 char per line warning ,
> braces and rela
On Sun, Jan 22, 2012 at 10:17 PM, Sukrit Sangwan
wrote:
> I found an instance where sizeof(struct xyz) is used instead of
> sizeof(variablename).
> I want to ask if it would be appropriate to contact the author about the
> same.
Well, this doesn't really matter, but the recommended practice is to
On Sun, Jan 22, 2012 at 8:14 PM, Sukrit Sangwan wrote:
> There are instances in the code where sizeof(*ptr) is used. e.g.
> in net/802/garp.c
> const struct garp_msg_hdr *gm;
> if (!pskb_may_pull(skb, sizeof(*gm)))
> return -1;
> i want to ask is there any sense in using sizeo
On Fri, Jan 20, 2012 at 11:56 AM, nilesh wrote:
> Hi,
>
> The question is not completely related to kernel. But I came across
> similar question when debugging in kernel.
>
> I tried dissecting the SSL library using 'nm' command. It is showing the
> list of symbols along with some generic addresse
On Thu, Dec 8, 2011 at 10:59 AM, solmac john wrote:
> Hi All,
>
> in glibc-2.13/nptl/sigaction.c, i just put a simple printf("test\n"); and my
> glibc compilation fails. Just adding a printf gives me multiple definitions
> of _itoa from dl-addr.c and i have no idea why. Can any body please tell me
On Wed, Nov 23, 2011 at 11:22 AM, Alexandru Juncu wrote:
> On Wed, Nov 23, 2011 at 10:40 AM, Geraint Yang wrote:
>> Hello everyone,
>>
>> I am going to hook a system call like 'read' or 'send' by modifying the
>> sys_call_table, but it seems that the sys_call_table is in read only page,
>> how ca
On Tue, Nov 22, 2011 at 12:46 PM, Graeme Russ wrote:
> Hi All,
>
> Hopefully this will help demystify the build process
>
> Notation:
> ()
> |
> +
> |
> *
> |
> \-> ()
>
> The file sizes are arbitrary and are based on the current configuration
> options I have set for a small kernel. The
On Mon, Nov 7, 2011 at 3:05 PM, Greg Freemyer wrote:
> Alexandru Juncu wrote:
>
>>Hello!
>>
>>I have been a linux user for many years, and mostly on the networking
>>side. And I would like to start contributing somehow to the linux
>>community (in some other way than just promoting it). I guess t
Hello,
> I wrote a sample module which looked like this and i expected the module to
> hang as i have used 2 spin_lock simultaneously. But i find the print after
> the second spin_lock being printed and the module works perfectly fine. Can
> any body please help me in understanding this? I got thi
On Fri, Oct 21, 2011 at 2:28 PM, sri wrote:
> Hi,
>
> Am using kernel 2.6.18-195(centos 5.5).
> My kernel configs have CONFIG_PREEMPT_NONE=7 and "CONFIG_PREEMPT_VOLUNTERY
> is not set".
> How to check that preemption is really in place?
> Is there any way to check my kernel is configured with what
On Wed, Oct 19, 2011 at 7:04 PM, Kai Meyer wrote:
> I can't seem to get my character device to remove itself from the
> /proc/devices list. I'm calling all of the following functions like so:
>
> alloc_chrdev_region(&dev, 0, 5, "my_char");
> cdev_init(&my_cdev, &my_ops);
> cdev_add(&my_cdev, MKDEV
On Mon, Oct 17, 2011 at 6:49 PM, Philip Anil-QBW348
wrote:
> -Original Message-
> From: Daniel Baluta [mailto:daniel.bal...@gmail.com]
> Sent: Saturday, October 15, 2011 3:34 AM
> To: Philip Anil-QBW348
> Cc: kernelnewbies@kernelnewbies.org
> Subject: Re: Getting '
On Sat, Oct 15, 2011 at 2:42 AM, Philip Anil-QBW348
wrote:
> I am calling the driver from an Android program (OMAP4/Blaze). It calls a
> c++ program via JNI which then calls the device driver.
> Someone suggested it might be a permissions problem - the program is running
> in user mode.
>
> on Bla
On Fri, Oct 14, 2011 at 5:04 PM, Parmenides wrote:
> Hi,
>
> I code a kernel module which do some nop. When inserted into the
> kernel, the kernel will be stuck and can not reponse my keypress
> anymore. So, I have to reboot to get out. Why?
Is kernel preemption activated? Could you check for #
Hello,
> I am trying to write to mydriver but get a 'Bad file number' error.
>
> int fd = open("/dev/mydriver",O_RDWR);
>
> this opens successfully as fd is not -1.
>
> ssize_t bytesToWrite = strlen(buf);
>
> value is: bytesToWrite 28
>
> ssize_t bytesWritten = write(fd,buf,bytesToWrite);
>
> valu
On Sat, Oct 8, 2011 at 7:19 PM, Parmenides wrote:
> 2011/10/8 Chetan Nanda :
>>
>> New task pick by scheduler may try to get the same lock resulting in
>> deadlock
>
> It seems that this kind of deadlock may be removed eventually. Suppose
> that we have a task A, which is holding a spinlock. If A
On Wed, Sep 21, 2011 at 10:26 PM, Abu Rasheda wrote:
> I am inserting packets into Linux stack and they are accepted by net_rx
> function, but are latter dropped. What tools are available in Linux kernel
> to for debugging this issue.
printk + dump_stack + your brain :).
thanks,
Daniel.
___
> Now the default value is of both the macros is same.
>
> But if you want to make delayed ack timeout configurable, then I think you
> should give proc interface for TCP_DELACK_MIN.
Thanks Rohan. Then also I have to export TCP_DELACK_MAX since I think
ato cannot grow over this value.
thanks,
Dan
Hello,
RFC2582, Section 4.2 says:
"... an ACK SHOULD be generated for at least every second
full-sized segment, and MUST be generated within 500 ms
of the arrival of the first unacknowledged packet. ".
I guess that the delayed ACK timeout is computed in tcp_send_delayed_ack:
===
void tcp_send_
On Mon, Sep 19, 2011 at 9:23 AM, Jon Zhou wrote:
> Hi
>
> I want to hashmap to store datat in kernel module, how can I do this? Any
> existed code?
Hello,
There are a lot of places where hashes are used. Just grep for 'hash'
through the kernel sources.
For example have a look at futex_queues [
Hello,
> i wrote a linux kernel module which uses mmap_sem in lots of places. I grab
> mmap_sem for both reads & writes. And, i also use page_table_lock spinlock
> under them. The problem i have is that there is a hard to reproduce a race
> condition bug in which a thread doesn't release the semap
On Wed, Aug 24, 2011 at 12:50 AM, Eric Dumazet wrote:
> Le mercredi 24 août 2011 à 00:32 +0300, Daniel Baluta a écrit :
>> On Tue, Aug 23, 2011 at 11:55 PM, Eric Dumazet
>> wrote:
>
>> > TCP in RFC 1122 section 4.2.2.13:
>> >
>> > "A host MA
On Tue, Aug 23, 2011 at 11:55 PM, Eric Dumazet wrote:
> Le mardi 23 août 2011 à 23:31 +0300, Daniel Baluta a écrit :
>> Hello,
>>
>> Please help me understanding the behavior of the following
>> TCP conversation.
>>
>> You can find bellow a snippet of the
Hello,
Please help me understanding the behavior of the following
TCP conversation.
You can find bellow a snippet of the (FTP) conversation captured both
on client (C) and server (S).
[client]$ tcpdump -n -r client-6-conv.cap
[P1] 49.045690 IP 10.10.0.1.21 > 10.10.0.20.58277: Flags [P.], seq
1
> I'm using fedora 15, and just compiled 3.0.1 stable. I'm getting a kernel
> panic when I close my laptop lid and it goes into suspend.
> How should I go about debugging this? Are there error logs I can check? Is
> there some way I can debug the linux kernel image?
> I'm a complete newb to linux d
On Sat, Aug 6, 2011 at 10:17 PM, subin gangadharan
wrote:
> Hi,
> This is a text excerpt from the article [1].
> Below paragraph I didn't understand quite well.Mainly in bold letters.Could
> anybody please explain how this will lead to an infinite loop.
It seems self-explanatory. Most atomic ops
Hello,
> I wish to get the current core id in which the code is being processed,
> in device driver code.
> What function or global variable can I use ?
I think smp_processor_id is the function you are looking for ([1]).
thanks,
Daniel.
[1] http://lxr.linux.no/linux+v3.0/include/linux/smp.h#L17
On Sat, Jul 16, 2011 at 10:23 AM, Abhishek Batta wrote:
> Hello everyone,
>
> Please point me to some useful links to start understanding linux dma .
Please check Documentation/ files:
* DMA-API-HOWTO.txt
* DMA-API.txt
thanks,
Daniel.
[1] http://lxr.linux.no/linux+v2.6.39/Documentation/DMA-API-
Hi,
> I am eager to understand the basics of Memory models (flat, segmented etc)
> , CPU modes (real,protected)
> and address translation (physical to logical etc.) and how all of them work
> together. I am very confused
> about this and would really appreciate if someone could provide good
> ref
On Tue, Jul 12, 2011 at 7:01 PM, Greg KH wrote:
> On Tue, Jul 12, 2011 at 12:15:17PM +0530, Prashant Shah wrote:
>> Hi,
>>
>> There are 4 branches in the staging tree
>>
>> remotes/staging/master
>> remotes/staging/ralink
>> remotes/staging/staging-linus
>> remotes/staging/staging-next
>>
On Tue, Jul 12, 2011 at 9:56 AM, Amit Nagal wrote:
> On Tue, Jul 12, 2011 at 11:51 AM, Tirtha Ghosh wrote:
>> Use a shared memory between user space and kernel space.
>> The same physical memory can be translated as user-space virtual address as
>> well as kernel space.
>> See more about mmap, io
On Wed, Jul 6, 2011 at 11:48 PM, Daniel Baluta wrote:
> Hello Prashant,
>
>> struct timer_list tim;
>>
>> void timfunc(unsigned long data)
>> {
> [..]
>> schedule_timeout(10 * HZ);
> [..]
>> }
>>
>> static int __init init_testmod(
Hello Prashant,
> struct timer_list tim;
>
> void timfunc(unsigned long data)
> {
[..]
> schedule_timeout(10 * HZ);
[..]
> }
>
> static int __init init_testmod(void)
> {
> init_timer(&tim);
> tim.expires = jiffies + HZ*5;
> tim.data = 1000;
> tim.function = timfu
On Wed, Jun 29, 2011 at 4:37 PM, Ponkumaran Annadurai
wrote:
>
>
> On Wed, Jun 29, 2011 at 12:42 PM, Daniel Baluta
> wrote:
>>
>> >>> I got struck in making initrd file, I got the following error
>> >>>
>> >>>
>>
On Wed, Jun 29, 2011 at 9:28 AM, Mulyadi Santosa
wrote:
> On Wed, Jun 29, 2011 at 01:08, Daniel Baluta wrote:
>> On Tue, Jun 28, 2011 at 8:39 PM, Ponkumaran Annadurai
>> wrote:
>>>
>>>
>>> I got struck in making initrd file, I got the following error
On Tue, Jun 28, 2011 at 8:39 PM, Ponkumaran Annadurai
wrote:
>
>
> I got struck in making initrd file, I got the following error
>
>
> root@rocker:/boot# mkinitramfs -o initrd.img-2.6.39.1 2.6.39.1Y
2.6.39.1Y? - shouldn't it be 2.6.39.1.
These days I cooked a script to compile the kernel. Perha
On Tue, Jun 28, 2011 at 3:36 PM, Amit Nagal wrote:
> Hi ,
>
> i want to test a linux driver to identify concurrecy issue that may
> arise on a SMP system .
> can i be advised with usage of some tools / mechanisms , so that the
> driver can be made SMP safe ?
Hi,
Check make menuconfig -> Kernel
On Tue, Jun 28, 2011 at 2:07 PM, Ponkumaran Annadurai
wrote:
>
>
> On Tue, Jun 28, 2011 at 1:13 PM, Daniel Baluta
> wrote:
>>
>> >> Have you tried to setup some sort of cross-compilation environment?
>> >> Could you check CROSS_COMPILE env variable?
>
>> Have you tried to setup some sort of cross-compilation environment?
>> Could you check CROSS_COMPILE env variable?
> Yes, I have given yes for that option during configuration
OK, then that's your problem. CROSS_COMPILE is a string
pointing to your cross compiler prefix.
thanks,
Daniel.
___
On Mon, Jun 27, 2011 at 7:21 PM, Ponkumaran Annadurai
wrote:
> Hello,
>
> I encountered the following error while compiling the kernel version
> linux-2.6.39.1. So I am giving here what I got on my screen.
>
> root@rocker:/usr/src/linux-2.6.39.1# make
> CHK include/linux/version.h
> CHK
Hello Murali,
> I have a device driver which provides the IOCTL function for the
> application to interact.
>
> when the application sends the IOCTL CMD_GO, my driver has to toggle a
> GPIO every 500 m Sec. until a 3 minute timeout occurs or a CMD_STOP
> IOCTL is received.
>
> I tried the DECLARE_
On Sun, Jun 19, 2011 at 9:33 AM, Amit Nagal wrote:
> Hi ,
>
> What are the best tools to trace linux kernel panics and system
> hangs for linux kernel .
> please recommend for x86 as well as arm platforms .
Look under kernel hacking. There are a lot of useful
tools like: kmemcheck, lockdep, sla
On Thu, Jun 16, 2011 at 2:41 PM, Venkateswarlu P
wrote:
> how to understand the kernerl source files in a simple way
>
>
> what header files i have to understand first
>
>
> for example to understand do_fork() function for process
> creation which is defined in kernel/fork.c
There'
> Now ,iam reading Linux kernel Development 3rd ed
>
>
> I want the explanation of each member of struct task_struct found in
>
Hello,
This structure is very well described in Chapter 2.3 from 'Professional
Linux Kernel Architecture' by W. Mauerer.
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