compiling kernel files with gcc

[abhijit kumar]

sir!
   There is no problem in compiling with Makefile.But, as i 've
mentioned in my last mail, i want to understand the
"/usr/src/linux/kernel/sched.c' .I want to play with it's parameters
and will try to include a pointer such that i can calculate waiting
time for process in the waiting queue(as, i guess this is n't already
implemented. if it is please give me some idea.) . For this purpose i
want to know that what vlaues of differnet MACRO has been used by the
sched.c . so; please send me information about it.

Abhijit
( i 'm sending this mail to fedora list because i think perhaps i 've
missed some points in my previous mail.)

On Wed, 03 Nov 2004 08:54:14 -0500, James Kosin
<jkosin at beta.intcomgrp.com> wrote:
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> abhijit kumar wrote:
> 
> |dear all!
> |  i want to compile my "/usr/src/inux/kernel/sched.c" with gcc -E .i
> |want to do this because i want to study and understand the "sched.c" .
> |when i was studying it i came to know that in linux many MACRO name
> |are used in multiple files. so ; it is very tough to know that which
> |value of MACRO my "sched.c" is actually using. for this purpose one of
> |my friend has suggested to use gcc -E option. but when i run it i have
> |following problem:--
> 
> Hmm... sounds like a homework question.
> 
> |
> |
> |[root at localhost root]# gcc -E /usr/src/linux/kernel/sched.c -isystem
> 
> 
> |/usr/src/linux/include >> backup.out
> |
> |In file included from /usr/src/linux/include/linux/sched.h:6,
> |                 from /usr/src/linux/include/linux/mm.h:4,
> |                 from /usr/src/linux/kernel/sched.c:20:
> |/usr/src/linux/include/linux/config.h:6:2: #error including kernel
> |header in userspace; use the glibc headers instead!
> |In file included from /usr/src/linux/include/linux/signal.h:4,
> |                 from /usr/src/linux/include/linux/sched.h:25,
> |                 from /usr/src/linux/include/linux/mm.h:4,
> |                 from /usr/src/linux/kernel/sched.c:20:
> |/usr/src/linux/include/linux/list.h:682:2: warning: #warning "don't
> |include kernel headers in userspace"
> |In file included from /usr/src/linux/include/linux/nmi.h:7,
> |                 from /usr/src/linux/kernel/sched.c:22:
> |/usr/src/linux/include/asm/irq.h:16:25: irq_vectors.h: No such file or
> directory
> |
> |i.e. it is n't correctly compiled and n't able to include some header
> |files and it gives some
> |"#warning "don't include kernel headers in userspace". please suggest
> |me what i should do for getting out of my problem.
> 
> A lot has changed since the previous kernels:
> ~    1)  Header files have moved.  A lot of the /linux/include files are
> not stored there anymore.
> ~    2)  Much of the architecture has changed with the latest kernels,
> Please read the associated documents included with the source to find
> out what has changed.
> 
> |
> |
> |If all of you have any link about some materials or tutorials to learn
> |about 2.6 kernel (specially it's process scheduling code and method )
> |please suggest me. i 've "understanding Linux kernel - o R'eily " and
> |"Linux Kernel Programming" both for kernel 2.4.it is n't helping me
> |(or perhaps i do n't know how to use it).
> 
> 
> What happens if you use the makefile.  It sounds a little like you want
> to compile the file all on its own.  It doesn't work this way.
> 
> You also have to take the 2.4.xx stuff with a grain of salt.  The 2.6.xx
> stuff has changed drastically in many respects.
> 
> |
> |Thanking You
> |Abhijit
> |
> Good Luck with your homework,
> James Kosin
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