add new system call - compiling error!

[nada]

Hi,
I downloaded kernel 2.6.32 ,and I want to add simple system call "hello world" , I followed steps - but while compiling I got these errors:

Make[1]: no rule to make target ('block/hello/sys_hello.o' needed by 'block/hello/built-in.o')
make ** [block/hello/]


here is my code. I use c

#include <linux/kernel.h>

asmlinkage long sys_hello(void)
{
printk("Hello world\n");
return 0;
}


This is the Makefile where I update only one line:


ifeq ($(KBUILD_EXTMOD),)
core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/hello/

vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
$(core-y) $(core-m) $(drivers-y) $(drivers-m) \
$(net-y) $(net-m) $(libs-y) $(libs-m)))

vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
$(init-n) $(init-) \
$(core-n) $(core-) $(drivers-n) $(drivers-) \
$(net-n) $(net-) $(libs-n) $(libs-))))

init-y := $(patsubst %/, %/built-in.o, $(init-y))
core-y := $(patsubst %/, %/built-in.o, $(core-y))
drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
net-y := $(patsubst %/, %/built-in.o, $(net-y))
libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
libs-y := $(libs-y1) $(libs-y2)

....................
I created another Makefile inside the folder I created named as hello

obj-y := sys_hello.o

I know that I should add some code in Makefile - Can you advise me what to add?

Thanks & regards,
N.A.S

 

[Akronix]

Hello.
You don't have to add more code to main Makefile, but just to fix it.

core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/hello/

There you are including a hypotetic directory block/hello/ (which doesn't exist), just add a whitespace between block/ and hello/.

I've just compiled also my own kernel some days ago, but it was a more recent version: 3.2 following a internet tutorial . happy hacking!

 

[nada]

Hello.
You don't have to add more code to main Makefile, but just to fix it.

There you are including a hypotetic directory block/hello/ (which doesn't exist), just add a whitespace between block/ and hello/.

I've just compiled also my own kernel some days ago, but it was a more recent version: 3.2 following a internet tutorial . happy hacking!

Akronix, thank you so much for your quick response!

I made a space ,and compiling is going on .Hope it works now.


Many thanks ,you saved my life

 

[nada]

Hi,
After 3 hours of compilation , I got this error :

ld: block: No such file: File format not recognized
make: *** [vmlinux.o] Error 1


How to solve this?

Thanks

 

[Akronix]

Hi, I'm not sure how you can fix that...
But, it would be easier to help you if you provide information about how you are compiling it (which command) and in which platform.
Maybe, how I did it could help you: http://www.linux.org/threads/some-questions-compiling-linux-kernel-with-make-kpkg.5919/

 

[nada]

Hi Akronix,
I'm using ubuntu 10.4 , working on kernel 2.6.32..
I downloaded a newer version of 2.6.32 kernel - v 2..6.32.61, it has been in compile for 4h till now.

Pray it will finish successfully!

For compiling ,I used [make oldconfig] & [make]
Then I'll use [make install_modules install.].

Thanks..

 

[Akronix]

Hello again.
But are you running ubuntu into a virtual machine or directly from the hard drive?

I'm not really an expert of this (as I said, I've just compiled linux kernel for first time); but I'd try to compile it without install_modules. Also I'm not sure if make oldconfig is the right one, so I'd try to use a diferent configuration. Me, I used make menuconfig.

Hope I have helped you in something, I don't think I can help you so much more.

 

[nada]

I use linux on VM.
As for make oldconfig , I used it to copy all old configurations to the new kernel - I got an error if I tried to [make] first .
I'll let you know about the result of my trial.

Thanks a lot for your answers , your first response was really helpful!

 

[nada]

Hi Akronix,
It worked with me finally