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Dev Environment?
by Daniel Hilst Selli Aug. 14, 2011

Aug. 14, 2011

Hey people.. I start to read a book about kernel, and want to make some changes to it, for study purpose. ue I think in edit it, an use qemu to test it with some minimal distribution installation. So how people usually do? Thanks! -- "Do or do not... there is no try" Yoda Master

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Need help in understanding sysfs
by Vaibhav Jain Aug. 12, 2011

Aug. 12, 2011

Hi, I need to undestand sysfs and make changes to it. Please provide me with some good references. Thanks Vaibhav Jain

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Re: about gcc-3.4.6
by esmaeil mirzaee Aug. 12, 2011

Aug. 12, 2011

On Fri, Jul 29, 2011 at 7:46 AM, Pravin Shedage <pravinshedage2008(a)gmail.com > wrote: > Hi Samuel, > > check the FTP link > ftp://ftp.mirrorservice.org/sites/sourceware.org/pub/gcc/releases/ > Actually I have gcc-3.4.6.tar.bz2 for process of installation I did: untar the file ./configure make but I've got error some of the error is: In function ‘open’, inlined from ‘collect_execute’ at ./collect2.c:1537:20: /usr/include/bits/fcntl2.h:51:24: error: call to ‘__open_missing_mode’ declared with attribute error: open with O_CREAT in second argument needs 3 arguments make[1]: *** [collect2.o] Error 1 make[1]: Leaving directory `/home/esmaeil/Documents/software/gcc-3.4.6/gcc' make: *** [all-gcc] Error 2 > > @enjoy.... > > > > On Fri, Jul 29, 2011 at 4:53 PM, Bernd Petrovitsch < > bernd(a)petrovitsch.priv.at> wrote: > >> Hi! >> >> On Fre, 2011-07-29 at 07:14 -0400, esmaeil mirzaee wrote: >> > apologize in advance, I know here is related the kernel but my >> >> Than why do you post here in the first place? >> >> [...] >> > I need gcc-3.4.6 for do work with ubuntu kernel and install some stuff >> > I needed. >> >> You can find the source on http.//gcc.gnu.org/ or - surpise! - via >> Google. >> >> > Again I'm so sorry for interrupt. >> >> No, you are not. >> Bernd >> -- >> Bernd Petrovitsch Email : bernd(a)petrovitsch.priv.at >> LUGA : http://www.luga.at >> >> >> _______________________________________________ >> Kernelnewbies mailing list >> Kernelnewbies(a)kernelnewbies.org >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> > > > > > > Thanks & Regards, > ---------PraviN--------- > > >

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SYSLOG_ACTION_READ_ALL question
by william douglas Aug. 12, 2011

Aug. 12, 2011

Hello all, I'm trying to figure out why the do_syslog code in kernel/printk.c is using put_user instead of copy_to_user. There is even a comment about how because of sleep, the buffer is read from back to front to minimize the impact of printk overwriting the syslog section we are using. That wouldn't be necessary if a temporary copy was made and then written out with copy_to_user. Does that make sense or am I missing something? Thanks, William

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What's the value of %cs before jump in pm32 on booting?
by jiangtao.jit Aug. 11, 2011

Aug. 11, 2011

Hi all: on booting of x86 top of file arch/x86/boot/pmjump.S there is code ------------------- GLOBAL(protected_mode_jump) movl %edx, %esi xorl %ebx, %ebx movw %cs, %bx shll $4, %ebx addl %ebx, 2f ... ------------------- what's the value of %cs here? how was it loaded? i would really appreciate if someone provide me some references thank you very much 2011-08-11 jiangtao.jit

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Mapped more than Cached in /proc/meminfo
by =/_00/\/\ Aug. 10, 2011

Aug. 10, 2011

Hi, I am trying to analyze memory usage on my system. As first step I am monitoring /proc/meminfo. Surprisingly I see Mapped value is more than Cached. So in which case is it possible to have Mapped more than Cached ? Regards, ~/

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difference between io_schedule() and schedule()
by Rajat Sharma Aug. 10, 2011

Aug. 10, 2011

Hi All, What is the difference between io_schedule() and schedule(), is io_schedule() more restrictive to shedule only I/O bound processes or it just favours I/O bound processes. Any documentation link would be great help. Thanks, Rajat

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Debugging Kernel Panic
by Zac Storer Aug. 10, 2011

Aug. 10, 2011

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 dev, so any help would be appriciated.

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Interrupt not getting re-enabled after handler is killed
by anish singh Aug. 10, 2011

Aug. 10, 2011

Intention: Wanted to modify the behavior of threaded interrupt handler not being called after the threaded_handler was killed. Reason: Well there is no reason as such but just want to see what all needs to be done to get this right.I know that what i am doing is completely wrong as i would get a strom of irq's and device will be unstable[1]. Modification: I thought if i remove the below line from exit_irq_thread function set_bit(IRQTF_DIED, &tsk->irqaction->flags); it would do.But nothing happened then i inspected closely i found that in-case we need to do that we have to again create kthread which i am not doing in-case we again receive the interrupt of the killed threaded_handler. So i came to this conclusion: Right now we need more that just setting the flag bit to get this right. Is the above right ?Yes/no? Or if my understanding is not right then probably the interrupt controller itself is not sending the interrupt after the thread is killed.If this is right where is the code for that? In my limited search i couldn't find where we are disabling the interrupt once the threaded_handler is killed. Hope i am clear about what i want to know. [1] http://thread.gmane.org/gmane.linux.kernel/811061

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About HPET is_hpet_capable()
by limp Aug. 9, 2011

Aug. 9, 2011

Hi all, I am having a deeper look on Linux hpet code and I was wondering how exactly is_hpet_capable() works. >From the name of it, I assume that this function checks if the system supports HPET or not but I can't really tell how it does that. The function is the following: static inline int is_hpet_capable(void) { return !boot_hpet_disable && hpet_address; } Could anyone help me understand how this works? Regards.

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