- kernelnewbies@kernelnewbies.org - Kernelnewbies Mailing Lists

Re: Are you interested in a Linux Kernel Off-topic Mailing List?
by rush Nov. 14, 2013

Nov. 14, 2013

>>> 14.11.2013, 13:57, "Aldo Iljazi" <mail(a)aldo.io>: >>> Okay guys I moved it to my custom domain using the http://www.nabble.com >>> service. >>> >>> Go to http://aldo.io and subscribe ;) >>> >>> -- >>> Aldo Iljazi >> >> rush wrote: >> >> Hi, >> >> It displays just a standard parking page of your domain name registerer. Is it ok? >> >> -- >> wbr, >> rush. >> > 14.11.2013, 14:09, "Aldo Iljazi" <mail(a)aldo.io>: > > If it doesn't work yet go to http://www.aldo.io/ > -- > Aldo Iljazi Thanks, now it works. -- wbr, rush.

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Re: Are you interested in a Linux Kernel Off-topic Mailing List?
by Aldo Iljazi Nov. 14, 2013

Nov. 14, 2013

rush wrote: > <div>A good option may be google groups. ( <a href="https://groups.google.com/forum/#!overview">https://groups.google.com/forum/#!overview</a> )</div><div> </div><div>-- <br /><div>wbr,</div><div>rush.</div></div><div> </div><div> </div><div>13.11.2013, 23:35, "Aldo Iljazi" <mail@aldo.io>:</div><blockquote type="cite"><p>So do you guys have any suggestions on where to setup the mailing list?<br /><br />Thanks for your feedback and interest :)<br />-- <br />Aldo Iljazi<br /><br />_______________________________________________<br />Kernelnewbies mailing list<br /><a href="mailto:Kernelnewbies@kernelnewbies.org">Kernelnewbies(a)kernelnewbies.org</a><br /><a href="http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies">http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies</a></p></blockquote> Please don't send HTML formatted emails. It's very hard to read. -- Aldo Iljazi

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RE: Introducing Myself, Looking to Learn
by Varad Gautam Nov. 14, 2013

Nov. 14, 2013

---------------------------------------- > But please note that if you're > finding it *completely* incomprehensible, you're probably not going to > be able to make any real code contributions until you get up to speed. Hi Vladis! Thanks for replying. I think I would be fine with writing real code once I figure out what goes where. Is there something I should start with, which would help me bring myself at par? Thanks. Varad

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What is the best distro for starting linux kernel development?
by Naman Shekhar Mishra Nov. 13, 2013

Nov. 13, 2013

Hi mentors, I have been studying the Linux kernel for some time and now I am going to try and get my hands hands dirty with the kernel. Can you please tell me what is the best distro for this? I have experience with Gentoo and LFS but would they be good if I just want to get involved in kernel development (and not the maintenance overhead that comes with these distros)? It would be useful for me if you could tell me the distro you use. Thanks and regards, Naman

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Regarding enumerating Block devices registered in kernel mode
by vaibhav Nov. 12, 2013

Nov. 12, 2013

Hi Mentors, I am working on a kernel module wherein I need to enumerate all the block devices registered with the kernel. Also looking for notifications when a block device gets added/remove. Google didn't help much and the thought of reading the contents of /sys/block from kernel mode looks messy to me. Looking for guidance on performing this enumeration. Thanks, VJ

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Building libraries and binaries using Kbuild in a different folder
by Sankar P Nov. 12, 2013

Nov. 12, 2013

Hi, I have a kernel module which is built using Kbuild. However, when I try to compile it via: make -C /lib/modules/`uname -r`/build M=$PWD The modules are built in the pwd. Is there a way to get all the generated files moved to a different location, so that my checkout area is clean ? Also, using my Kbuild file, I build more than one .ko files. Is there a way to build only one target ? i.e., If my .ko generates a.ko ,b.ko and c.ko, Is there a way to build b.ko alone if I want ? Thanks. -- Sankar P http://psankar.blogspot.com

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Question on Platform Device/Driver
by sanchayan maity Nov. 11, 2013

Nov. 11, 2013

Can someone give me some pointers or tell me as to how can one use a platform driver for reading and writing? For example, if i have a wm97xx codec IC, a core platform driver is provided (as on the below link). http://lxr.free-electrons.com/source/drivers/input/touchscreen/wm97xx-core.c If i wanted to use this core driver to read the auxilary ADC's of wm97xx codec how do i go about using the register read, write functions or read auxiliary adc functions provided by this driver file? I have gone through the documentation provided here http://lxr.free-electrons.com/source/Documentation/driver-model/ but it is still not clear to me. I understand the concept of why a platform driver is required and how each device registers itself with the pseudo platform bus, but, i do not understand how to use such a driver or make my driver based on it and then use it for reading/writing. I understand character device drivers but, i am at a loss when it comes to understand these platform drivers. I come from embedded domain and these drivers seem are ubiquitous. Thanks.

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Re: Physical address of Page Table Entries
by Mark Wallace Nov. 9, 2013

Nov. 9, 2013

Thanks Jeff. Solved my problem. Below is my further investigation to support Jeff's idea. The size of a Page Table (not a single entry) at any level is exactly 1 page. 2 level: 10+10+12. linear address will assign 10 bits for Page Directory and 10 bits for Page Table, and thus each Page Table will have 2^10=1K entries, and each entry has 4 Bytes. That's 4K in total, the same to the size of one page. 3 level for ia64: the paging mechanism is 9+9+9+12. Each level will have 2^9=512 entries. and 8 Bytes for each entry. Thus take up 512*8=4K in total. Again is the size of one page. On 11/09/2013 09:56 AM, Jeff Haran wrote: > I believe the directory entries are all exactly 1 page and page aligned. The number of bits of address space each level covers is derived from this and the size of each page table entry which has to be big enough to contain whatever the physical address size is on the CPU. Take a look at the various definitions of PGDIR_SHIFT and PAGE_SHIFT in the various arch directories. Page tables on 32 bit machines can contain 1K 32 bit entries (4KB) but on 64 bit machines they only contain 512 64 bit entries (still 4KB). > > Jeff Haran > > From: kernelnewbies-bounces(a)kernelnewbies.org [mailto:kernelnewbies-bounces@kernelnewbies.org] On Behalf Of Mark Wallace > Sent: Friday, November 08, 2013 5:38 PM > To: kernelnewbies(a)kernelnewbies.org > Subject: Physical address of Page Table Entries > > Hi all, > > Question: > When we use 2 level paging(Directory+Table+Offset), does the page table entries have to be put exactly on the beginning of a page frame? > > Description: > The format of Page Directory and Page Table are the same. And they all contain 20 bits as a pointer to the next level entries. > > For Page Table entry, I understand that 20 bits is enough because page frames are 4k aligned. But for Page Directory entry, the 20 bits should be the address of a Page Table, that means the physical address of a Page Table entry should be 4k aligned too. And thus they may only exist at the beginning of a page frame. > > Is this right or am I missing something? > > Thanks.

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Physical address of Page Table Entries
by Mark Wallace Nov. 9, 2013

Nov. 9, 2013

Hi all, *Question: * When we use 2 level paging(Directory+Table+Offset), does the page table entries have to be put exactly on the beginning of a page frame? *Description: * The format of Page Directory and Page Table are the same. And they all contain 20 bits as a pointer to the next level entries. For Page Table entry, I understand that 20 bits is enough because page frames are 4k aligned. But for Page Directory entry, the 20 bits should be the address of a Page Table, that means the physical address of a Page Table entry should be 4k aligned too. And thus they may only exist at the beginning of a page frame. Is this right or am I missing something? Thanks.

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How to find out which part of code is changing a particular data structure.
by Rajat Jain Nov. 8, 2013

Nov. 8, 2013

Hi folks, I have a memory location (One of the fields in a kernel data structure) and I want to track down the code that changes the value of that particular location. Some thing like a "watchpoint". And this is early while I am still booting up. Can some one tell me if it is possible to do so? Thanks, Rajat

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