Re: Re: A new way to dive into the kernel! [Eudyptula Challenge]
On Wed, Mar 12, 2014 at 1:39 AM, Rahul Garg rahul.lnm...@gmail.com wrote: Hi all, I am also thinking of taking this challenge. But I found very limited information on submission. So can you help me what we need to submit for the Assigment 1, Hi Rahul, Please send in your assigmnet1.c file with the Makefile. Those two files are what I sent in for Task 01. will dmesg (or /proc/kmsg) output and module(assignement1.c and Makeflie) be enough ?? Yes this will be fine, what I sent in for Task 01 wa tail -f /var/log/messages you can use any method of choice to prove you actually did compile then load and unload the module. Entirely left up to you :) Also is there any group of forum where we can discuss assignments ? I felt the same when I first started on this but over time I have realised why we are asked to do this alone. It simply makes us search for relevant information and we learn the hard way but what is learnt will never be forgotten unlike cutting and pasting some working code someone else did. That being said when ever I have had questions or got stuck with a assignment I have found most times immediate and fast helpful responses so I feel if you first TRY then submit what you have that will be the begining of a very enlightening journey for you as it has definitely been for me. I am on my fifth task and this is something I have always wanted to learn to do ever since I first started meddling with DOS Interrupts way back in 1982 and that is writing device drivers. Whatever you send in please make sure it is in PLAIN TEXT format, else will immediately be rejected. There is valid reason behind this and that is all linux kernel level work is done using git and email and plain text is the preferred mode of patch submission. Hope this has helped and I wish you good luck. It is fully worth investing your time in as I have learnt so much I am humbled. Thank's - Aruna Regards Rahul ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Please help.. trying to use USB keyboard to open a shell on LCD display
Hello, folks, It is a comfort to me that I have people to ask questions here and I hope I could be answering to some hard quetions someday. I've beeing trying to attach a USB keyboard to our embedded system to open a shell on the LCD display using framebuffer console. The USB host controller is from the opencore(USB1.1) and it works for USB memory. Some of the boot arguments are (I've tried some variants) console=tty1 fbcon=map:,font:SUN8x16,vc:1-3 root=/dev/ram The problem is, after the final sys_execve() which executes /sbin/init of the ramdisk, I cannot see any printf results frome the busybox init_main function not to mention the shell. So I cannot use shell commands like getty. Using uart as the console I can see printf results in the busybox init_main routine. (I use console=ttyS,mmio,0xff003000,115200n8 in that case) Using some prints on separate uart print routine, I can see from the kbd_event function that the key value is going to current vc which is using tty1. The key value is then handed to put_queue function where the character is somehow copied to tty buffer. Flush_to_ldisc is scheduled for it and it will probably get passed on to the virtual console. By the way, I guess the keyboard data is delivered to current fg_console (vc 0 which is using tty1). Added to this, there is a notifier_call_chain and the notifier block is registered by vcs_poll_data_get function which I don't know weather is necessary or not. So one of my questions is if vcs is necessary for my case. (I guess not. There is no other notifier blocks registered) I gathered that without inittab (I don't use inittab which should be ok for most cases) the assumed default inittab tty2::askfirst:-/bin/sh tty3::askfirst:-/bin/sh tty4::askfirst:-/bin/sh is being applied by the busybox so there maybe 3 shells on tty2,tty3, and tty4 running somewhere. But even if there are shells running I don't know how to switch to those ttys. I tried using Ctrl-Alt F2 (or F3, F4) using the USB keyboard to switch to tty2,3,4 to see if any shell comes up on the LCD but couldn't see it. I tried using inittab with no avail before. And I don't know how the printf in busybox is connected to the kernel. I guess busybox talks with stdio(stdout,stdin..) and the file is connected to the kernel anyhow. I've digged up how vc driver is connected to the console switch functions and to the bit blitting functions and how the printk is handled in the kernel. But these console, tty, framebuffer console.. things are very complex to me. and I hope somebody could point me to what should be checked. Any hint will be deeply appreciated. Best Regards, Chan ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.orgmailto:Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: where is the printf source for busybox?
ssize_t attribute_hidden _cs_write(void *cookie, const char *buf, size_t
bufsize)
{
return write(*((int *) cookie), (char *) buf, bufsize);
}
what does cs stand for here? (Hm.. seems like custom streams..in the
code) and I couldn't follow past write above. Where is the function write
defined?
Hi Chan,
write is a system call.
$ man 2 write
syscall table for x86 architecture can be found in :
path/arch/x86/syscalls/syscall_32.tbl
# cat path/arch/x86/syscalls/syscall_32.tbl | grep 'write'
4 i386write sys_write
The format is:
number abi name entry point compat entry point
search sys_write definition in kernel source.
Thanks
Mohan L
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RE: where is the printf source for busybox?
Wow, that was it. I'm happy to hear that because I thought it should end up
with a system call anyway.
Then isn't there some codes making the system call? Or is it that the compiler
understands that 'write' is a system call and inserts the assembly code for
calling it by itself?
Thanks in adv.
Chan
From : Mohan L l.mohan...@gmail.com
Sent : 2014-03-12 15:31:24 ( +09:00 )
To : Kim Chan c...@etri.re.kr
Cc : Dave Hylands dhyla...@gmail.com, kernelnewbies@kernelnewbies.org
kernelnewbies@kernelnewbies.org
Subject : Re: where is the printf source for busybox?
ssize_t attribute_hidden _cs_write(void *cookie, const char *buf, size_t
bufsize)
{
return write(*((int *) cookie), (char *) buf, bufsize);
}
what does cs stand for here? (Hm.. seems like custom streams..in the code) and
I couldn't follow past write above. Where is the function write defined?
Hi Chan,
write is a system call.
$ man 2 write
syscall table for x86 architecture can be found in :
path/arch/x86/syscalls/syscall_32.tbl
# cat path/arch/x86/syscalls/syscall_32.tbl | grep 'write'
4 i386write sys_write
The format is:
number abi name entry point compat entry point
search sys_write definition in kernel source.
Thanks
Mohan L
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Re: How to use sparse to check my driver
Hi, silverstri how does it actually call 'spare'? Do I need to modify my Makefile to add a new target or something? If you called 'make C=2 ... ', the make will auto call sparse to check the source. Obviously, you should install sparse first. If you do the 'make C=2 drivers/staging/wlan-ng/', and don't get the check results, I think maybe the 'wlan-ng' doesn't include in your built target. Please use 'make menuconfig' to add the target wlan-ng. 1. make menuconfig 2. select 'Device Drivers --' 3. select 'Staging drivers --' 4. select 'Prism2.5/3 USB driver' like this ' M Prism2.5/3 USB driver' 5. exit the menuconfig 6. make C=2 drivers/staging/wlan-ng/ then you will get the check result. I had test it on kernel v2.6.32.61, and got the messages below: CHK include/linux/version.h CHK include/linux/utsrelease.h SYMLINK include/asm - include/asm-x86 CALL scripts/checksyscalls.sh CHECK scripts/mod/empty.c CHECK drivers/staging/wlan-ng/prism2usb.c drivers/staging/wlan-ng/hfa384x_usb.c:2810:62: warning: dubious: !x | !y drivers/staging/wlan-ng/prism2fw.c:124:14: warning: symbol 'ns3data' was not declared. Should it be static? drivers/staging/wlan-ng/prism2fw.c:125:13: warning: symbol 's3data' was not declared. Should it be static? drivers/staging/wlan-ng/prism2fw.c:128:14: warning: symbol 'ns3plug' was not declared. Should it be static? drivers/staging/wlan-ng/prism2fw.c:129:13: warning: symbol 's3plug' was not declared. Should it be static? drivers/staging/wlan-ng/prism2fw.c:132:14: warning: symbol 'ns3crc' was not declared. Should it be static? drivers/staging/wlan-ng/prism2fw.c:133:12: warning: symbol 's3crc' was not declared. Should it be static? drivers/staging/wlan-ng/prism2fw.c:136:14: warning: symbol 'ns3info' was not declared. Should it be static? drivers/staging/wlan-ng/prism2fw.c:137:13: warning: symbol 's3info' was not declared. Should it be static? drivers/staging/wlan-ng/prism2fw.c:140:5: warning: symbol 'startaddr' was not declared. Should it be static? drivers/staging/wlan-ng/prism2fw.c:143:14: warning: symbol 'nfchunks' was not declared. Should it be static? drivers/staging/wlan-ng/prism2fw.c:144:12: warning: symbol 'fchunk' was not declared. Should it be static? drivers/staging/wlan-ng/prism2fw.c:152:7: warning: symbol 'pda' was not declared. Should it be static? drivers/staging/wlan-ng/prism2fw.c:153:21: warning: symbol 'nicid' was not declared. Should it be static? drivers/staging/wlan-ng/prism2fw.c:154:20: warning: symbol 'rfid' was not declared. Should it be static? drivers/staging/wlan-ng/prism2fw.c:155:20: warning: symbol 'macid' was not declared. Should it be static? drivers/staging/wlan-ng/prism2fw.c:156:20: warning: symbol 'priid' was not declared. Should it be static? drivers/staging/wlan-ng/prism2fw.c:193:5: warning: symbol 'prism2_fwtry' was not declared. Should it be static? drivers/staging/wlan-ng/prism2fw.c:237:15: warning: memset with byte count of 12 drivers/staging/wlan-ng/prism2fw.c:460:15: warning: memset with byte count of 12 CC [M] drivers/staging/wlan-ng/prism2usb.o In file included from drivers/staging/wlan-ng/prism2usb.c:5:0: drivers/staging/wlan-ng/prism2fw.c: In function prism2_fwtry: drivers/staging/wlan-ng/prism2fw.c:208:9: warning: format %d expects argument of type int, but argument 3 has type size_t [-Wformat] drivers/staging/wlan-ng/prism2fw.c: In function writeimage: drivers/staging/wlan-ng/prism2fw.c:1109:1: warning: the frame size of 4272 bytes is larger than 2048 bytes [-Wframe-larger-than=] CHECK drivers/staging/wlan-ng/p80211conv.c CHECK drivers/staging/wlan-ng/p80211req.c CHECK drivers/staging/wlan-ng/p80211wep.c CHECK drivers/staging/wlan-ng/p80211wext.c CHECK drivers/staging/wlan-ng/p80211netdev.c LD [M] drivers/staging/wlan-ng/prism2_usb.o == Best Regards! wangyubin On 03/12/2014 05:31 AM, m silverstri wrote: I am trying to use sparse to check my driver that I developed. From http://kernelnewbies.org/Sparse, It said 'make C=2 drivers/staging/wlan-ng/', what does it check it I do 'make C=2' and how does it actually call 'spare'? Do I need to modify my Makefile to add a new target or something? Thank you. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies . ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Does register_chrdev function make device file under /dev ?
On Tue, 11 Mar 2014 08:01:26 -, Kim Chan said: To my understanding, device file is needed when a user program wants to access the device and we don't need to generate the device file for us to use the device in kernel. Is my understanding correct? Right. You don't need to generate the device file because you shouldn't be accessing the device in a file-like manner from inside the kernel. I am trying to open a shell on my LCD (is it going to be tty2 That's userspace, not kernel access. pgp1FTlZNga7b.pgp Description: PGP signature ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Not mounting rootfs
On Tue, 11 Mar 2014 23:54:25 -0300, Flavio Ceolin said: Any tip is extremely welcome :) [0.820886] List of all partitions: tip 1: What would you expect to see here that isn't here? That's right, an output of what partitions it found. -hda ./buildroot-2013.05/output/images/rootfs.ext2 seems to have misfired. Either that, or '-append root=/dev/ram0' and ram0 doesn't point at a root file system. You might want to decide whether ram0 or ext2 is where you want taht root to be [0.821097] No filesystem could mount root, tried: [0.821399] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) pgpmsh35WIHlU.pgp Description: PGP signature ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Re: A new way to dive into the kernel! [Eudyptula Challenge]
On Wed, Mar 12, 2014 at 10:14 AM, Saurabh Jain saurabh4768j...@gmail.com wrote: I'm Sorry! but i am new to this mailing list . Can anybody tell me about which assignment you people are talking ? Here you go : http://eudyptula-challenge.org/ ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: A new way to dive into the kernel!
I signed up last month and received and completed my first task. I got a congratulations email for the first task, but have not received any subsequent assignments. Any idea what I should do about that? Ron Dahlgren http://www.dahlgren.so | @ScaleItRon On Mar 10, 2014 11:22 PM, Aruna Hewapathirane aruna.hewapathir...@gmail.com wrote: It seems too many people signed up at the moment... causing the scripts to malfunction. Should be resolved in a day or two is what I was told. I have so far received four tasks. Thank you ! Aruna On Tue, Mar 11, 2014 at 2:14 AM, Srivardhan M S srivardha...@gmail.comwrote: Yes... Just sent the solution for the 1st assignment... You not gettting? What is the issue? Thank-you, Sri On Tue, Mar 11, 2014 at 11:19 AM, Mandeep Sandhu mandeepsandhu@gmail.com wrote: Yes. Just remember to send a plain text mail. HTH, -mandeep On Tue, Mar 11, 2014 at 10:36 AM, sanjeev sharma sanjeevsharmae...@gmail.com wrote: Hello All, Have you guys getting your assignment's ? Regards Sanjeev Sharma On Wed, Mar 5, 2014 at 10:50 AM, Mallesh Koujalagi mallesh.koujalagi.sandi...@gmail.com wrote: Good info, thanks for sharing On Tue, Mar 4, 2014 at 8:38 PM, Amit Saha amitsaha...@gmail.com wrote: On Wed, Mar 5, 2014 at 2:19 PM, Mandeep Sandhu mandeepsandhu@gmail.com wrote: Came across this in Greg (KH)s G+ feed. http://eudyptula-challenge.org/ Thought I'd share it here too in case someone missed it. Looks like a fun and interesting way to start off doing stuff in the kernel! Interesting! Thanks for sharing. -- http://echorand.me ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: A new way to dive into the kernel!
And now the second task has arrived. Thanks to whomever kicked the machine into action :-) Ron Dahlgren http://www.dahlgren.so | @ScaleItRon On Mar 12, 2014 8:28 AM, Ronald Dahlgren ronald.dahlg...@gmail.com wrote: I signed up last month and received and completed my first task. I got a congratulations email for the first task, but have not received any subsequent assignments. Any idea what I should do about that? Ron Dahlgren http://www.dahlgren.so | @ScaleItRon On Mar 10, 2014 11:22 PM, Aruna Hewapathirane aruna.hewapathir...@gmail.com wrote: It seems too many people signed up at the moment... causing the scripts to malfunction. Should be resolved in a day or two is what I was told. I have so far received four tasks. Thank you ! Aruna On Tue, Mar 11, 2014 at 2:14 AM, Srivardhan M S srivardha...@gmail.comwrote: Yes... Just sent the solution for the 1st assignment... You not gettting? What is the issue? Thank-you, Sri On Tue, Mar 11, 2014 at 11:19 AM, Mandeep Sandhu mandeepsandhu@gmail.com wrote: Yes. Just remember to send a plain text mail. HTH, -mandeep On Tue, Mar 11, 2014 at 10:36 AM, sanjeev sharma sanjeevsharmae...@gmail.com wrote: Hello All, Have you guys getting your assignment's ? Regards Sanjeev Sharma On Wed, Mar 5, 2014 at 10:50 AM, Mallesh Koujalagi mallesh.koujalagi.sandi...@gmail.com wrote: Good info, thanks for sharing On Tue, Mar 4, 2014 at 8:38 PM, Amit Saha amitsaha...@gmail.com wrote: On Wed, Mar 5, 2014 at 2:19 PM, Mandeep Sandhu mandeepsandhu@gmail.com wrote: Came across this in Greg (KH)s G+ feed. http://eudyptula-challenge.org/ Thought I'd share it here too in case someone missed it. Looks like a fun and interesting way to start off doing stuff in the kernel! Interesting! Thanks for sharing. -- http://echorand.me ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: A new way to dive into the kernel! [Eudyptula Challenge]
I'm glad to hear that this challenge is real, and someone's getting something out of it. When the challenge first appeared I saw that there was very little actual information on its web page, and when I sent an email inquiry (somewhat testy, I admit), I got snarky humour in response, leading me to believe the whole thing was probably some kind of antisocial prank. I still don't like that the organizers are anonymous, of unknown competence, but that's between them and those who choose to take them up on the challenge. -- Arlie (Arlie Stephens ar...@worldash.org) Hi Arlie, Anonymous you say ? If you have a look at this : https://www.kernel.org/ then have a another careful look at this: http://eudyptula-challenge.org/ do you see a resemblance ? kernel.org is not a bunch of jerks neither are they anonymous or anti-social exactly the opposite actually. Unknown competence huh ? Am guessing here as well but that kind of humour can only initiate from gregkh and as you know he is the stable kernel maintainer and has given this a whole lot of thought... and you send out 'testy' emails what did you expect to get back ? You reap what you sow my dear :) Have no illusions about this it is very REAL and am betting my life's savings this is gregkh at work so you are being mentored by ze man himself. Though I somehow do not think he will acknowledge to this.. If you view the source at http://eudyptula-challenge.org/ you will see : !-- Wait, this looks like the kernel.org theme! You stole it, I'm going to sick my badgers on you! Relax man, the kernel.org theme is MIT licensed. See the main.css file for details if you really want to know more. -- It really does not get any better than this, this is sincere transparency and accountability to me but given one has to know where to look but that is all the more fun ? Aruna ( Unknown competence and anti-social my brown skinny ass - no offence meant ) ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: A new way to dive into the kernel!
But doesnt it encode the attachments into base64. How to avoid that? -Sanmukh On Wed, Mar 12, 2014 at 9:52 AM, Mandeep Sandhu mandeepsandhu@gmail.com wrote: I'm using gmail on the web. You can send plain text mails from it if thats what you're worried about. HTH, -mandeep ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: A new way to dive into the kernel!
Try thunderbird http://www.mozilla.org/en-US/thunderbird/ On Wed, Mar 12, 2014 at 12:56 PM, sanmukh rao i.sanm...@gmail.com wrote: But doesnt it encode the attachments into base64. How to avoid that? -Sanmukh On Wed, Mar 12, 2014 at 9:52 AM, Mandeep Sandhu mandeepsandhu@gmail.com wrote: I'm using gmail on the web. You can send plain text mails from it if thats what you're worried about. HTH, -mandeep ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: A new way to dive into the kernel!
Thanks :) I am using mutt by the way. So got covered. -Sanmukh ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: A new way to dive into the kernel!
Used Thunderbird this time with plain text settings. Hope it works. Appreciate the suggestions. On Mar 12, 2014 10:29 PM, sanmukh rao i.sanm...@gmail.com wrote: Thanks :) I am using mutt by the way. So got covered. -Sanmukh ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: A new way to dive into the kernel! [Eudyptula Challenge]
On Mar 12 2014, Aruna Hewapathirane wrote: I'm glad to hear that this challenge is real, and someone's getting something out of it. When the challenge first appeared I saw that there was very little actual information on its web page, and when I sent an email inquiry (somewhat testy, I admit), I got snarky humour in response, leading me to believe the whole thing was probably some kind of antisocial prank. I still don't like that the organizers are anonymous, of unknown competence, but that's between them and those who choose to take them up on the challenge. -- Arlie (Arlie Stephens ar...@worldash.org) Hi Arlie, Anonymous you say ? If you have a look at this : https://www.kernel.org/ then have a another careful look at this: http://eudyptula-challenge.org/ do you see a resemblance ? kernel.org is not a bunch of jerks neither are they anonymous or anti-social exactly the opposite actually. Aha - I'm not well plugged into the linux kernel community. I don't have the familiarity with website styles that would lead me to notice patterns. I've used a bunch of them, but that doesn't mean I've paid attention to style. Unknown competence huh ? Am guessing here as well but that kind of humour can only initiate from gregkh and as you know he is the stable kernel maintainer and has given this a whole lot of thought... and you send out 'testy' emails what did you expect to get back ? You reap what you sow my dear :) It's all a matter of who has the bigger ego ;-) I saw a new site that wasn't even in google yet, and made no attempt to establish credentials. I also compared it with its supposed model, the Matasano Crypto Challenge at http://www.matasano.com/articles/crypto-challenges/ and saw major differences in things that mattered to me - the crypto site explains who is behind it, and includes relevant articles. The Eudylypta site has nothing. I know I'm competent and well meaning, and don't know that they are, and reacted accordingly. _If_ the site owners are people known and well regarded in the linux community, _they_ saw a person who wasn't known there, and therefore was clueless-by-definition, and should know better than to challenge their well regarded majesty - even with them unidentified ;-) _If_ on the other hand, they were a bunch of college kids being more clever than usual about getting the intenet to do their homework (my first thought), or trolls wanting to see how many innocent newbies they could take in (my second thought) then they saw someone too smart to be taken in, who needed to be chased away lest they spoil the scam. Their reaction was consistent with either possibility. Have no illusions about this it is very REAL and am betting my life's savings this is gregkh at work so you are being mentored by ze man himself. Though I somehow do not think he will acknowledge to this.. Perhaps. I'm not familiar with his sense of humour, though recent postings (last year) interactions on LKML suggest he's less bitey than Linus, which is a good sign. Truth to tell, I haven't paid much attention to who's who in the linux community, except Mel Gorman, and I'm a lot more likely to read linux-mm than the full LKML feed. (Yes, I'm a memory management type, by inclination at least.) It really does not get any better than this, this is sincere transparency and accountability to me but given one has to know where to look but that is all the more fun ? Aruna ( Unknown competence and anti-social my brown skinny ass - no offence meant ) *rofl* I can copy someone else's web page source (MIT licensed or not) and put up a joke web page using it. If it's appropriately licensed (as this one is) I wouldn't even be doing anything illegal. That doesn't mean I'm the author of whatever I copy. Anyway, I hope it is Greg Kroah-Hartman, or someone equally competent and overall well regarded. Though the truth is, the second part doesn't much matter, if people are getting something out of the course. --- Arlie (Arlie Stephens ar...@worldash.org) ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: where is the printf source for busybox?
Hi, On Tue, Mar 11, 2014 at 11:55 PM, Kim Chan c...@etri.re.kr wrote: Wow, that was it. I'm happy to hear that because I thought it should end up with a system call anyway. Then isn't there some codes making the system call? Or is it that the compiler understands that 'write' is a system call and inserts the assembly code for calling it by itself? In uclibc, the write source code is found here: http://git.uclibc.org/uClibc/tree/libc/sysdeps/linux/common/write.c How the syscall is actually implemented is architecture specific, and will be in one of the directories here: http://git.uclibc.org/uClibc/tree/libc/sysdeps/linux For example, for ARM, with EABI, then I believe that it winds up here: http://git.uclibc.org/uClibc/tree/libc/sysdeps/linux/arm/syscall-eabi.S The SWI instruction transfers control to the kernel. On the kernel side, how the syscalls get handled is also architecture specific, but it will generally wind up at a function called sys_FUNCTION, however the generation of the function name is usually hidden behind a macro. So sys_write in the kernel winds up being declared here: http://lxr.linux.no/#linux+v3.13.5/fs/read_write.c#L514 -- Dave Hylands Shuswap, BC, Canada http://www.davehylands.com ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: A new way to dive into the kernel! [Eudyptula Challenge]
snip Aha - I'm not well plugged into the linux kernel community. I don't have the familiarity with website styles that would lead me to notice patterns. I've used a bunch of them, but that doesn't mean I've paid attention to style. Oh-kay fair enough... and understood :) Unknown competence huh ? Am guessing here as well but that kind of humour can only initiate from gregkh and as you know he is the stable kernel maintainer and has given this a whole lot of thought... and you send out 'testy' emails what did you expect to get back ? You reap what you sow my dear :) It's all a matter of who has the bigger ego ;-) I myself personally have no ego due to being suddenly made to realize long years ago by the wifey that if I was being a real jerk then I had to go cook my own dinner ( Back then I had no idea how to boil an egg let alone cook a decent meal and yes I was being a jerk ) Soo.. ever since then I do not subscribe to this ego thing prefer to be humble and laid back ! I saw a new site that wasn't even in google yet, and made no attempt to establish credentials. I also compared it with its supposed model, the Matasano Crypto Challenge at http://www.matasano.com/articles/crypto-challenges/ and saw major differences in things that mattered to me - the crypto site explains who is behind it, and includes relevant articles. The Eudylypta site has nothing. Well that link to the Matasano Crypto ChallengeI IS right there on the eudyptula challenge site that should have rung a bell no ? I know I'm competent and well meaning, and don't know that they are, and reacted accordingly. Fair enough again and understood again :) _If_ the site owners are people known and well regarded in the linux community, _they_ saw a person who wasn't known there, and therefore was clueless-by-definition, and should know better than to challenge their well regarded majesty - even with them unidentified ;-) The site uses teh exact same css from kernel.org that makes me think someone from kernel.org is behind all this ? _If_ on the other hand, they were a bunch of college kids being more clever than usual about getting the intenet to do their homework (my first thought), or trolls wanting to see how many innocent newbies they could take in (my second thought) then they saw someone too smart to be taken in, who needed to be chased away lest they spoil the scam. Oh-kay my turn to apologize, one lives and learns... you did the right thing by questioning ! Their reaction was consistent with either possibility. Have no illusions about this it is very REAL and am betting my life's savings this is gregkh at work so you are being mentored by ze man himself. Though I somehow do not think he will acknowledge to this.. Perhaps. I'm not familiar with his sense of humour, though recent postings (last year) interactions on LKML suggest he's less bitey than Linus, which is a good sign. Like I said am GUESSINg but everything points to gregkh... or someone in his team ! Truth to tell, I haven't paid much attention to who's who in the linux community, except Mel Gorman, and I'm a lot more likely to read linux-mm than the full LKML feed. (Yes, I'm a memory management type, by inclination at least.) Aaagh I dislke segfaults to little pieces :) It really does not get any better than this, this is sincere transparency and accountability to me but given one has to know where to look but that is all the more fun ? Aruna ( Unknown competence and anti-social my brown skinny ass - no offence meant ) *rofl* I can copy someone else's web page source (MIT licensed or not) and put up a joke web page using it. If it's appropriately licensed (as this one is) I wouldn't even be doing anything illegal. That doesn't mean I'm the author of whatever I copy. True and agreed ! Anyway, I hope it is Greg Kroah-Hartman, or someone equally competent and overall well regarded. Though the truth is, the second part doesn't much matter, if people are getting something out of the course. Arlie believe me I personally learnt a whole lot of things and I sincerely believe anyone joining who has the patience and perseveres will be a happy cookie. You have a happy day my friend :) --- Arlie (Arlie Stephens ar...@worldash.org) ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
kernel build problems with KDB patch
Hello
I want to use KDB to debug the module.
I have done this:
1. make mrproper
2. download the patch from the site
(ftp://oss.sgi.com/www/projects/kdb/download/). Include
kdb-v4.4-2.6.32-common-6.bz2 and kdb-v4.4-2.6.32-x86-6.bz2
3. patch -p1 kdb-v4.4-2.6.32-common-6
patch -p1 kdb-v4.4-2.6.32-x86-6
4. make menuconfig
Kernel hacking ---
Compile the kernel with frame pointers(set Y)
Built-in Kernel Debugger support (set Y)
KDB off by default(set Y)
5. make
ERROR LOG:
arch/x86/kernel/traps.c:418 error:expected identifier or '(' before 'if'
arch/x86/kernel/traps.c:437 error:expected identifier or '(' before 'if'
arch/x86/kernel/traps.c:441 error:expected identifier or '(' before 'if'
...
conflicting types for 'reassert_nmi'
...note:previous definition of 'reassert_nmi' was here
...
What should I do ?
Thanks,
HeChuan___
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