Re:

[leo kirotawa]

You need to install openssl-devel,  so it'll fix this issue :)

On Fri, Sep 18, 2015 at 1:49 AM, Shraddha Barke  wrote:
> I updated my local kernel repository with all recent commits using the
> following commands-
> git checkout staging-next
> git pull
>
> After that when I try to compile, I'm getting an error
>
> scripts/sign-file.c:20:25: fatal error: openssl/bio.h: No such file or
> directory
>  #include 
>  ^
> compilation terminated.
> scripts/Makefile.host:91: recipe for target 'scripts/sign-file' failed
> make[1]: *** [scripts/sign-file] Error 1
> Makefile:545: recipe for target 'scripts' failed
> make: *** [scripts] Error 2
>
>
> What should I do to fix it?
>
> Thanks in advance.
>
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Re: Help debugging linux-next.

[leo kirotawa]

git bisect would be a choice.
Seems your issue is around i915, that is related to intel graphics,
isolate commits in this area would be another way



On Sun, Sep 13, 2015 at 2:09 PM, Lucas Tanure  wrote:
> Hi,
>
> I would like some tips about how debug a issue with linux-next.
> I'm trying to find things to do in kernel, and the first thing is boot the
> linux-next tree.
>
> I'm able to compile the source, but when I boot I got a black screen a few
> times, or a just a warn in dmesg.
>
> I'm trying to understand the issue, but no success. I tried to get kdump
> from the issue, but didn't work. I also tried to go back a few commits in
> linux-next, but my system doesn't boot at all.
>
> How I can find the commit that create the problem, since every commit that I
> tested I got black screen ?
> Whats the best way to debug this kind of issue ?
>
> Thanks!
>
> My full warning:
>
> [ cut here ]
> WARNING: CPU: 3 PID: 243 at drivers/gpu/drm/drm_drv.c:569
> drm_dev_alloc+0x251/0x320 [drm]()
> Modules linked in: i915(+) joydev input_leds mousedev intel_rapl iosf_mbi
> x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm ttm hid_generic
> drm_kms_helper crct10dif_pclmul snd_hda_intel crc32_pclmul usbhid
> snd_hda_codec crc32c_intel drm hid ghash_clmulni_intel snd_hda_core
> eeepc_wmi asus_wmi aesni_intel iTCO_wdt sparse_keymap snd_hwdep led_class
> aes_x86_64 lrw snd_pcm iTCO_vendor_support rfkill mxm_wmi evdev gf128mul
> intel_gtt e1000e glue_helper mac_hid snd_timer syscopyarea ablk_helper
> cryptd sysfillrect psmouse snd sysimgblt pcspkr fb_sys_fops ptp mei_me
> i2c_i801 i2c_algo_bit soundcore mei shpchp i2c_core pps_core lpc_ich
> serio_raw wmi fan battery processor thermal video button sch_fq_codel
> ip_tables x_tables ext4 crc16 mbcache jbd2 sd_mod atkbd libps2 ahci libahci
> libata
>  xhci_pci xhci_hcd ehci_pci ehci_hcd scsi_mod usbcore usb_common i8042 serio
> CPU: 3 PID: 243 Comm: systemd-udevd Not tainted 4.2.0-next-20150912-ARCH #5
> Hardware name: System manufacturer System Product Name/Maximus IV GENE-Z,
> BIOS 3603 11/09/2012
>   5ca47666 88060f70b9d0 812b9159
>   88060f70ba08 81074e62 880612d39000
>  a06c7100 880612f66098 a06c7100 a0691760
> Call Trace:
>  [] dump_stack+0x4b/0x72
>  [] warn_slowpath_common+0x82/0xc0
>  [] warn_slowpath_null+0x1a/0x20
>  [] drm_dev_alloc+0x251/0x320 [drm]
>  [] drm_get_pci_dev+0x3b/0x1e0 [drm]
>  [] i915_pci_probe+0x34/0x50 [i915]
>  [] local_pci_probe+0x45/0xa0
>  [] ? pci_match_device+0xe0/0x110
>  [] pci_device_probe+0x103/0x150
>  [] driver_probe_device+0x222/0x490
>  [] __driver_attach+0x84/0x90
>  [] ? driver_probe_device+0x490/0x490
>  [] bus_for_each_dev+0x6c/0xc0
>  [] driver_attach+0x1e/0x20
>  [] bus_add_driver+0x1eb/0x280
>  [] driver_register+0x60/0xe0
>  [] __pci_register_driver+0x4c/0x50
>  [] drm_pci_init+0xe0/0x110 [drm]
>  [] ? 0xa06e6000
>  [] i915_init+0xa4/0xab [i915]
>  [] do_one_initcall+0xb3/0x200
>  [] ? __vunmap+0x91/0xe0
>  [] do_init_module+0x5f/0x1ef
>  [] load_module+0x2197/0x27e0
>  [] ? symbol_put_addr+0x50/0x50
>  [] ? __pte_alloc_kernel+0xa5/0xf0
>  [] SyS_init_module+0x14e/0x190
>  [] entry_SYSCALL_64_fastpath+0x12/0x71
> ---[ end trace d2652104b24a32ff ]---
>
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Re: module debugging

[leo kirotawa]

IMO, I believe if you module is using/hanging all processors it's
impossible to kernel use any to print stuffs. What about try Sysrq [1]
?  I used it once in a power system plus xmon, but I'll be honest not
sure how it works on x86.

https://www.kernel.org/doc/Documentation/sysrq.txt

On Fri, Aug 21, 2015 at 8:06 AM, Salam Farhat salal...@gmail.com wrote:
 Hi,

 I am not sure if this is the place to ask, if so please let me know where to
 do so.

 I am using a kernel module that I modified slightly to work on my current
 kernel version. It is running on a virtual machine and on a heavy load it
 goes into an infinite loop and freezes the system. I can tell that the
 virtual machine is using 100% of its assigned cpu. There are print
 statements almost everywhere in the module, but after a few seconds none get
 printed.



 The kernel has the following options already enabled:
 CONFIG_DETECT_SOFTLOCKUP  and

 CONFIG_DETECT_HUNG_TASK. To my understanding the kernel is supposed to print
 the stack trace when a hung task is detected, however, nothing gets printed
 in kern.log. I am not sure if this is the place where the kernel would dump
 the stack or if the print process is affected by the hang since the print
 statements in the module are not being printed as well.



 I would like to know how to debug this issue. Any help is appreciated.



 Thank you.






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Re: Safety in Kernel Development

[leo kirotawa]

For memory leaks kernel has a clever mechanism to verify it that you
can enable in .config for use [1].
You can also uses Sparse in kernel for static analyze purpose.

There are others out there such as coverity scan, coccinelle, etc.

[1] https://www.kernel.org/doc/Documentation/kmemleak.txt

[]'s


On Tue, Aug 18, 2015 at 10:45 AM, Kenneth Adam Miller
kennethadammil...@gmail.com wrote:
 Why? That's what the vast majority of the kernel is written in (besides
 assembler, but what I'm looking for isn't a way to write safe assembler).
 Plus, tons of people in the kernel development community *must* have some
 concern or interest in security. I don't care if the kernel is written in C,
 but I sure would like my kernel module to be safer. If I can get it I don't
 care what language it's in-it just has to work and *be secure*.

 On Tue, Aug 18, 2015 at 9:40 AM, Robert P. J. Day rpj...@crashcourse.ca
 wrote:

 On Tue, 18 Aug 2015, Kenneth Adam Miller wrote:

  Ok- so I know that C is the defacto standard for kernel
  development...

   and that's probably where you should have stopped typing. :-)

 rday

 --

 
 Robert P. J. Day Ottawa, Ontario, CANADA
 http://crashcourse.ca

 Twitter:   http://twitter.com/rpjday
 LinkedIn:   http://ca.linkedin.com/in/rpjday
 



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Re: how to delete kernels cleanly

[leo kirotawa]

I often delete files related to these kernels in /boot/, then
grub2-mkconfig -o /boot/grub/grub.cf , but I'm quite sure lib/modules
will still remain

On Wed, Jul 22, 2015 at 11:41 AM, Ahmed Soliman
ahmedsoliman0x...@gmail.com wrote:
 I have many kernels on my machine and I want to delete some of them
 what can I do
 some of these kernels are shipped with the OS ubuntu 14.04 and others I built 
 by
 make oldconfig
 make all
 make modules
 sudo make modules_install
 sudo make install

 now how can I these kernels

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Re: what is the use of #ifndefs

[leo kirotawa]

it means you don't want to redefine a .h file

On Mon, Jul 20, 2015 at 7:03 AM, Ahmed Soliman
ahmedsoliman0x...@gmail.com wrote:
 currently I started reading through the linux kernel and I started
 reading liunx/include/linux/list.h I understood some of the functions
 but still I dont know what does these lines of code do
 #ifndef _LINUX_LIST_H
 #define _LINUX_LIST_H
 which exist at the very beginning of the file
 I also noticed that there is many similar ifndefs in almost any .h
 file in the kernel
 note that I understand wnat does ifndef do bu I dont understand what
 goal is it supposed to achieve at the beginning of the headerfile

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Re: 4.1-rc1 fails with O3 optimization

[leo kirotawa]

I could boot it using qemu. So what's the point?

On Tue, Apr 28, 2015 at 2:41 AM, Andev debian...@gmail.com wrote:

 On Mon, Apr 27, 2015 at 9:00 PM, Bobby Powers bobbypow...@gmail.com
 wrote:
  Hello,
 
  Andev wrote:
  I usually compile my kernel with an unsupported O3 option(why not? :).
 
  Because there have been publications that show on major benchmarks,
  the effects of -O3 are indistinguishable from noise:
  http://people.cs.umass.edu/~emery/pubs/Stabilizer-UMass-CS-TR2011-43.pdf
 
  Have you noticed that -O3 provides any performance benefits over -O2?
 

 Look here: http://www.spinics.net/lists/kernel/msg1962561.html

 Btw, this will help uncover problems in either gcc or the kernel for
 sure. So no harm in trying!

 --
 Andev

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Re: 4.1-rc1 fails with O3 optimization

[leo kirotawa]

that .config you sent is for 4.0-rc2, is that right?


here is the diff after a make oldconfig [1]

[1] http://pastebin.com/4Lfs2it0

On Tue, Apr 28, 2015 at 12:35 PM, Andev debian...@gmail.com wrote:
 On Tue, Apr 28, 2015 at 9:03 AM, leo kirotawa kirot...@gmail.com wrote:
 I could boot it using qemu. So what's the point?

 Could you try the attached config and see if it boots?


 On Tue, Apr 28, 2015 at 2:41 AM, Andev debian...@gmail.com wrote:

 On Mon, Apr 27, 2015 at 9:00 PM, Bobby Powers bobbypow...@gmail.com
 wrote:
  Hello,
 
  Andev wrote:
  I usually compile my kernel with an unsupported O3 option(why not? :).
 
  Because there have been publications that show on major benchmarks,
  the effects of -O3 are indistinguishable from noise:
  http://people.cs.umass.edu/~emery/pubs/Stabilizer-UMass-CS-TR2011-43.pdf
 
  Have you noticed that -O3 provides any performance benefits over -O2?
 

 Look here: http://www.spinics.net/lists/kernel/msg1962561.html

 Btw, this will help uncover problems in either gcc or the kernel for
 sure. So no harm in trying!

 --
 Andev

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Re: 4.1-rc1 fails with O3 optimization

[leo kirotawa]

With this .config you sent kernel does not boot.

On Tue, Apr 28, 2015 at 1:46 PM, leo kirotawa kirot...@gmail.com wrote:
 that .config you sent is for 4.0-rc2, is that right?


 here is the diff after a make oldconfig [1]

 [1] http://pastebin.com/4Lfs2it0

 On Tue, Apr 28, 2015 at 12:35 PM, Andev debian...@gmail.com wrote:
 On Tue, Apr 28, 2015 at 9:03 AM, leo kirotawa kirot...@gmail.com wrote:
 I could boot it using qemu. So what's the point?

 Could you try the attached config and see if it boots?


 On Tue, Apr 28, 2015 at 2:41 AM, Andev debian...@gmail.com wrote:

 On Mon, Apr 27, 2015 at 9:00 PM, Bobby Powers bobbypow...@gmail.com
 wrote:
  Hello,
 
  Andev wrote:
  I usually compile my kernel with an unsupported O3 option(why not? :).
 
  Because there have been publications that show on major benchmarks,
  the effects of -O3 are indistinguishable from noise:
  http://people.cs.umass.edu/~emery/pubs/Stabilizer-UMass-CS-TR2011-43.pdf
 
  Have you noticed that -O3 provides any performance benefits over -O2?
 

 Look here: http://www.spinics.net/lists/kernel/msg1962561.html

 Btw, this will help uncover problems in either gcc or the kernel for
 sure. So no harm in trying!

 --
 Andev

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Re: 4.1-rc1 fails with O3 optimization

[leo kirotawa]

Yep, I can try. Do you know when this issue start ?

On Tue, Apr 28, 2015 at 3:18 PM, Andev debian...@gmail.com wrote:
 On Tue, Apr 28, 2015 at 1:40 PM, leo kirotawa kirot...@gmail.com wrote:
 With this .config you sent kernel does not boot.

 Yup, could you try to bisect what commit is causing this failure?

 --
 Andev



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scatterlist copy to buffer and copy back

[leo kirotawa]

Hi there,

I'm facing with an issue that from a module the user sends a scatterlist
which has sizes not power of two and because that I can not handle it
properly in my module in other side.
An example is:
- scatterlist entries size 3 and data size 4096.
- in other side module needs to build blocks in power of two sizes, but
since scatterlist are size 3 or any size not power of two it's not
possible.
From my understanding, entries gives a segment's size of the buffer passed.
And each entries has an address to this piece.
So if buffer is something like this:

|| - buffer
scatter list will be spread in memory like this:
| entry | entry | entry | ..., of course spread in memory.

As a solution I'm thinking in copy those scatterlist to a buffer and
process this buffer as a power of two sizes pieces, and so put the result
in the output buffer and into the output scatterlist size not power of two.
I know it seems a stupid solution, since scatterlist were done to help
spread data from a buffer in not continual space and improve performance.
So...

*Question is*, is there any way I can copy a scatterlist size 3 to another
scatterlist size power of two or any size? I didn't see any function in
scatterlist.c api for this, just those solutions to copy from to buffer or
buffer to scatterlist.

Any suggestions or tips are very welcome :)
Thanks in advance,
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Re: Skb Documentation?

[leo kirotawa]

git grep is your friend. :)
http://www.linuxjournal.com/article/1312


On Thu, Aug 14, 2014 at 1:40 PM, Nick Krause xerofo...@gmail.com wrote:

 After searching around in the documentation directory, I need no
 information on skb data structure and other information relating to
 skb
 data type. If someone knowns where there is Documentation in the
 kernel directory please tell me, otherwise I would be glad to write
 up.
 Regards Nick

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Re: Eudyptula Challenge Submission and no response?

[leo kirotawa]

Sometimes they take a long time to answer, maybe they are stuck again,
just be patient and resend :)

On Thu, Jun 5, 2014 at 10:10 AM, Kristofer Hallin
kristofer.hal...@gmail.com wrote:
 Guess the scripts are somewhat busy, give them a few more days.

 On Thu, Jun 5, 2014 at 3:05 PM, Fernando Apesteguía
 fernando.apesteg...@gmail.com wrote:

 El 05/06/2014 14:59, George E. Moore g...@x-ctr-l.com escribió:



 Is there a POC (email contact for Eudyptula Challenge)? Submitted
 response to Eudyptula Challenge, task 01 (05/23/14) and have yet to
 receive response.

 Patience. A lot of people are taking the challenge.

 Cheers.

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Re: How to fix ubuntu 12.10 can't start with kernel 3.15?

[leo kirotawa]

Did you type make modules ? It's sounding as module issue.

On Wed, May 21, 2014 at 10:16 AM, lx lxlenovos...@gmail.com wrote:

 hi all:

 I get the kernel in branch:

 git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
 And I config and make it by:

 make localmodconfig
 make
 make modules_install
 make install

 when these have done, I reboot the computer. I can see kernel 3.15 in
 grub list. When I start with it, the screen is:

 Loading Linux 3.15.0-rc5+ ...
 Loading initial ramdisk ...

 then the screen stopped. So How can fix it?
 I can't find any useful error messages because the computer don't get
 into the kernel.
 Thank you.

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Re: Eudyptula Challenge Task 02 Doubt

[leo kirotawa]

I sent the first lines from dmesg, it shows the info of  system boot.

On Sat, May 17, 2014 at 2:08 AM, me storage me.storage...@gmail.com wrote:
 Hai
 i successfully completed task 2 but i don't what files i have to send for
 proof.
 So can any one please tell me how to prove the custom kernel is booting?
 thanks

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Re: Linux Device Driver

[leo kirotawa]

Book I would recommend: Linux Devices Drivers [1]. And to get familiar
with kernel stuff [2]


[1] https://lwn.net/Kernel/LDD3/
[2] http://eudyptula-challenge.org/

[]'s

On Mon, May 5, 2014 at 11:16 AM, Saurabh Jain saurabh4768j...@gmail.com wrote:
 Hello everyone!

 I am new to  Linux Kernel . i studied a  about CFS and processes a little
 bit. I want to write Device Drivers for Linux Kernel . Can any body tell me
 from where i should start?
 I completely new to this field , i do not know how to start and from where
 to start?
 Any recommended book ?

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Re: Linux Device Driver

[leo kirotawa]

As they say, kernel code is the better and updated
source/documentation. There is no an updated book.

 =)

On Mon, May 5, 2014 at 11:37 AM, Lucas Tanure tan...@linux.com wrote:
 Yeah, but https://lwn.net/Kernel/LDD3/ it's a little bit old.



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Re: How can I send multiple patches?

[leo kirotawa]

I like to think that if they applies to different parts , all separate is
better.



On Thu, Oct 31, 2013 at 1:55 PM, Aldo Iljazi m...@aldo.io wrote:

 Hello everyone, I have a question.

 Let's say I have four patches, how can I send them?

 Should I send them one-by-one or can I send them all together?

 Could you give me one example?

 Thanks.
 --
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Re: kexec

[leo kirotawa]

Sorry, silly question, but did you try as root? kexec load tries to put the
knew kernel on memory and after that tries a syscall to kexec_load to
finish with a kexec_reboot, since it handles with mem and syscalls maybe
just as a root you will run it properly

 Also have that ke...@lists.infradead.org list.

[]'s


On Thu, Oct 3, 2013 at 10:05 AM, Dmitry Kolesov apolen...@gmail.com wrote:

 Hello.

 Could anybody help with kexec. I cannot find some informaton from google.
 I try to use kexec for fast boot new kernel but I have error below:

 # kexec -l /boot/vmlinuz-3.12.0-rc1+
 --initrd=/boot/initramfs-3.12.0-rc1+.img --command-line=$(cat
 /proc/cmdline)
 kexec_load failed: Operation not permitted
 entry   = 0x24eff5790 flags = 3e
 nr_segments = 3
 segment[0].buf   = 0x7fd169783210
 segment[0].bufsz = 505250
 segment[0].mem   = 0x24d00
 segment[0].memsz = 1413000
 segment[1].buf   = 0xbc3770
 segment[1].bufsz = 4310
 segment[1].mem   = 0x24efef000
 segment[1].memsz = 5000
 segment[2].buf   = 0xbba650
 segment[2].bufsz = 90e0
 segment[2].mem   = 0x24eff5000
 segment[2].memsz = b000

 KEXEC option in the config is enabled.

 How can I decid this problem?

 Regards,
 Dmitry

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Kexec sys call code

[leo kirotawa]

Hi,

I'm working in a project and there I need use kexec code to do somethings.
I read a lot of the kexec-tools code (user-land) and kexec-sys call
(k-land) and I'd like to be sure about some arguments there.

In kexec we have that kexec_image and into it that nr_segments and the
segments itself. I know that kernel image passed by kexec in user land
(bzImage) is copy in a buffer and in kexe_load it receives the entry point
for this new kernel (bzImage)  and the start position where (I'm supposing
) start the kernel image. So , my question is, using that nr_segments or
segemtns by itself can I determine the size of the bzImage/image in
kexec-sys call?

And these guesses about entry point and the address of start kernel image,
is it correct?

This is the kexec.c file (where we have the sys call and  a bunch of
another code).

http://lxr.free-electrons.com/source/kernel/kexec.c
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Re: Will kernel in-place decompression overwrite uncompressed part ?

[leo kirotawa]

I don't know if it can help you, but let's try. [1]
What I understand about that is. The compressed kernel is in fact a bzImage
or some zImage kernel, and it is a file. As the link says in that
compressed file we have this header that makes some early configurations.
The kernel is uncompressed into the memory and the compressed kernel
remains in the place it was before. Just what matter by the compressed
kernel is that header info that it use to setup the stack to the new kernel.

I'm no sure if I'm talking some nosense, but that was what I saw in kernel
boot files. Maybe some others mate here can complement or fix my thoughts
here.


[1] http://www.ibm.com/developerworks/library/l-linuxboot/

On Fri, Mar 8, 2013 at 10:12 PM, Jacky jackycli...@163.com wrote:


 Dear All,

 Before, kernel first decompressed to other memory location and then merged
 and put at final destination. Now, kernel decompression  are decompressed
 in-place, so-called in-place decompression.

 But the compressed part is encompassed by uncompressed part. So, after
 decompression, will the uncompressed part be overwritten by the
 decompressed kernel ? If so, some uncompressed part such as deal with
 kernel relocation will be overwritten by the decompressed kernel, which
 don't make sense, am I missed something ?

 Regards,
 Jacky





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-- 
Leônidas S. Barbosa (Kirotawa)

Engenheiro de Software - IBM (LTC - Linux Technology Center)
MsC Sistemas e Computação
Bacharel em Ciências da Computação.

blog nerd: corecode.wordpress.com/

http://corecode.wordpress.com/User linux : #480879

Mais sábio é aquele que sabe que não sabe (Sócrates)
smile and wave - =D + o/ (Penguins of Madagascar)

日本語の学生です。
コンピュータサイエンスの学位.
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