March 2017 - kernelnewbies@kernelnewbies.org - Kernelnewbies Mailing Lists

edit wiki
by Tobin C. Harding March 28, 2017

March 28, 2017

Hi Rik, Could you please add me to the list of names for editing the kernelnewbies wiki. thanks, Tobin.

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edit wiki
by Tobin C. Harding March 28, 2017

March 28, 2017

Could someone please add me to the list of names for editing the kernelnewbies wiki. >From https://kernelnewbies.org/ To prevent wiki spam, only users on this list are allowed to edit the wiki. Any of these users can add new usernames to the list. If you need to be on the list, please ask in #kernelnewbies on irc.oftc.net or on the mailing list. thanks, Tobin.

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Re: Problem in loading module of Software trigger
by SIMRAN SINGHAL March 27, 2017

March 27, 2017

On Sun, Mar 26, 2017 at 1:47 PM, Jonathan Cameron <jic23(a)jic23.retrosnub.co.uk> 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 > think those are the only ones you will need. Thanks modprobe works for me as it's depended on industrialio-sw-trigger.ko But now I am facing one more probem with iio_generic_buffer in tools/iio I am trying to execute iio_generic_buffer: as given I can use -N <num> -t <trigger_name> I create trigger with name trig-sample present in /config/iio/triggers/trig-sample. $./iio_generic_buffer -N iio_dummy_part_no iio device number being used is 0 Failed to find the trigger my_dummy_device-trigger Its giving me ^ this error: What wrong I am doing? I have loaded all the modules including iio_dummy_evgen, iio_dummy. How I will be pass trig-sample as an argument to it? and one more question how can I find Trigger-number of a trigger. I am facing same problem with iio_event_monitor:- $ ./iio_event_monitor /sys/bus/iio/devices/iio_evgen/poke_ev0 getting following error:- Failed to retrieve event fd Same with all other events. This is working fine for me: echo 1 > /sys/bus/iio/devices/iio_evgen/poke_ev0 Thanks Simran > > J > > > > On 26 March 2017 08:02:05 BST, SIMRAN SINGHAL <singhalsimran0(a)gmail.com> wrote: >>I read this documentation "Documentation/iio/iio_configfs.txt" for >>creating software trigger. >> >>So, by following this I created the module with name iio-trig-sample.c >>in drivers/iio/trigger/. >> >>iio-trigger-sample.c also compiled successfully. >> >>Now, when I tried to insert module: >> >>$ sudo insmod iio-trig-sample.ko >>insmod: ERROR: could not insert module iio-trig-sample.ko: Unknown >>symbol in module >> >>Ans in /var/log/kern.log: >>I am getting following reason:- >>iio_trig_sample: Unknown symbol iio_unregister_sw_trigger_type (err 0) >>iio_trig_sample: Unknown symbol iio_register_sw_trigger_type (err 0) >>-- >>To unsubscribe from this list: send the line "unsubscribe linux-iio" in >>the body of a message to majordomo(a)vger.kernel.org >>More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- > Sent from my Android device with K-9 Mail. Please excuse my brevity.

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Is there a simple method to keep memory coherent between two different cpus
by kipade March 27, 2017

March 27, 2017

Here I want to share a block of physical memory between two different cpus. I want to simple use original real mode memory address. Is there a simple way to invalid linux memory cache after writing to and before reading from it? ex. invalid_cache_range(u32 phy_address, u32 length). My cpu is arm. Thanks.

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How to report bugs for release candidates?
by Martin Kletzander March 26, 2017

March 26, 2017

Hi everyone, I was usually using Bugzilla when I wanted to report something, but what if, for example, I can't boot 4.11-rc3? Is bugzilla fast enough for such type of regressions? Can I attach any more information than debug output over netconsole? Even that is assuming I will get any, which might not be the case since it doesn't get anywhere. I'm booting directly from UEFI, so the EFI stub implementation might be related to that. I'd really like to know how to debug some of these things, but that's probably for later. Thanks for letting me know and have a nice day, Martin

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Kernel merge warning
by Amit Kumar March 26, 2017

March 26, 2017

Hi, I get following warnings when merge kernel branches. warning: inexact rename detection was skipped due to too many files. warning: you may want to set your merge.renamelimit variable to at least 6158 and retry the command. Is it OK to go with above suggestion and increase merge.renamelimit? Thanks in advance for any help. Regards, Amit Kumar

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Problem in loading module of Software trigger
by SIMRAN SINGHAL March 26, 2017

March 26, 2017

I read this documentation "Documentation/iio/iio_configfs.txt" for creating software trigger. So, by following this I created the module with name iio-trig-sample.c in drivers/iio/trigger/. iio-trigger-sample.c also compiled successfully. Now, when I tried to insert module: $ sudo insmod iio-trig-sample.ko insmod: ERROR: could not insert module iio-trig-sample.ko: Unknown symbol in module Ans in /var/log/kern.log: I am getting following reason:- iio_trig_sample: Unknown symbol iio_unregister_sw_trigger_type (err 0) iio_trig_sample: Unknown symbol iio_register_sw_trigger_type (err 0)

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Mapping of virtual to physical addresses
by Stefan Tatschner March 23, 2017

March 23, 2017

Hallo everybody, currently I am trying to understand the internal memory allocation mechanisms of the kernel. I am particularly interested in the translation of virtual memory addresses to physical addresses. Additionally, how are these physical addresses located in the relevant RAM Modules? I have read that even in the kernel there are "virtual" physical addresses... Could somebody give me some pointers to further literature about this topic? During my research, I discovered the /proc/pid/pagemap file [1]. I find the documentation a bit sparse and I do not understand how I can use this file properly. If somebody could share some examples, that would be great! Regards, Stefan [1]: https://www.kernel.org/doc/Documentation/vm/pagemap.txt

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My kernel patch was rejected with comments
by Prasant J March 22, 2017

March 22, 2017

Hi, I submitted a kernel patch and it was rejected with comments from maintainer. Is it important to reply with a new patch against maintainers response mail? Or it it ok if I send a new email with the updated patch? I have mutt and git send-mail setup but I can only send mail with those. How do I reply to a maintainers comment? I manually copied Message-ID from gmail web GUI and tried using it in "--in-reply-to" with git send email but when I saw the linux mailing list, it did weird things. It sent a blank reply to maintainers email and sent a new mail with my updated patch. Is there any tutorial on how can a I setup my workflow? Any inputs will be of great help here! Regards, Pj

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How do I know if my patch was accepted?
by Prasant J March 21, 2017

March 21, 2017

Hi, I was able to send a tiny coding style error correction patch to the kernel mailing list. How do I find out whether my patch was accepted or not? How do I find out subsystem maintainers git tree for my patch (patch related to drivers/staging/vt6656/ )? Regards, Pj

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