ioperm and iopl

[Adil Mujeeb]

Hi list,

Are we going to remove the support of ioperm and iopl system call in
future kernel release? I heard it but not sure if its already removed
or candidate for removal.

Regards,
Adil

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Re: kernel stack memory

[Adil Mujeeb]

Hi,

On Thu, Sep 13, 2012 at 1:59 PM, Arun KS getaru...@gmail.com wrote:
 Hello Shubham,

 On Thu, Sep 13, 2012 at 12:15 PM, shubham sharma shubham20...@gmail.com
 wrote:

 Hi,

 As far as i know, the size of stack allocated in the kernel space is
 8Kb for each process. But in case i use more than 8Kb of memory from
 the stack then what will happen? I think that in that case the system
 would crash because i am accessing an illegal memory area. I wrote
 kernel module in which i defined an integer array whose size was 8000.
 But still it did not crash my system. Why?

 The module i wrote was as follows:

 #include linux/kernel.h
 #include linux/module.h

 int __init init_my_module(void)
 {
 int arr[8000];
 printk(%s:%d\tmodule initilized\n, __func__, __LINE__);
 arr[1] = 1;
 arr[4000] = 1;
 arr[7999] = 1;

 Instead do a memset.
 memset(arr, 0, 8192);

 If you do this the current calling process thread_info will be set to zero.
 This should cause a crash.

I tried and this is also not causing any crash.

Thanks,
Adil

 Thanks,
 Arun



 printk(%s:%d\tarr[1]:%d, arr[4000]:%d, arr[7999]:%d\n, __func__,
 __LINE__, arr[1], arr[4000], arr[7999]);
 return 0;
 }

 void __exit cleanup_my_module(void)
 {
 printk(exiting\n);
 return;
 }

 module_init(init_my_module);
 module_exit(cleanup_my_module);

 MODULE_LICENSE(GPL);

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Re: Tool for automatic style of coding guidelines

[Adil Mujeeb]

On Fri, Jan 27, 2012 at 11:45 PM, Greg KH g...@kroah.com wrote:
 On Fri, Jan 27, 2012 at 05:50:30PM +0530, Prajosh Premdas wrote:
 Hi

 I have developed some kernel drivers and would like to send the patches for
 review. But i find that I have not followed the coding guideline for tabs and
 spaces properly, which can be easily corrected by using some tools like
 astyle.

 Can any body please help me with the proper commands string for the astyle
 tool? Or could any body please suggest me with any new tool like indent etc
 which you are using

 scripts/Lindent will give you a good start, but odds are you really want
 to do this by hand, it will be easier in the end as indent can do some
 strange things at times.

 good luck,

 greg k-h

You can see this excellent video [1] where Greg has explained how to
submit your first patch.

[1] http://www.youtube.com/watch?v=LLBrBBImJt4

Regards,
Adil

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Device mapper header file error

[Adil Mujeeb]

Hi List,

** **

I am trying to compile a kernel module which uses the device mapper header
files (dm.h and dm-bio-list.h). I checked in the stock kernel source that
these files are present under drivers/md directory.

When I try to build the module, it gives error for these header files as
missing. I checked the Makefile and found that it includes the path
(-I$(TOPDIR)/ drivers/md)

** **

But when I check the content of this directory on my machine it doesn’t
include the header files:

[root@localhost redhat]# ls /usr/src/kernels/2.6.18-8.el5-i686/drivers/md***
*

Kconfig  Makefile  raid6test

[root@localhost redhat]#

** **

While the other header files referred by the kernel module under
include/linux directory exists.

** **

My machine detail:

[adil@localhost ~]$ uname -a

Linux localhost.localdomain 2.6.18-8.el5 #1 SMP Fri Jan 26 14:15:21 EST 2007
i686 i686 i386 GNU/Linux

[adil@localhost ~]$

** **

Thanks in advance.

**

Regards,

Adil Mujeeb
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