Could someone please answer a stupid question...

- J
- jahurt
  
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posted
20 years ago

Fri, Aug 1, 2003 3:47 PM

I have the following bare-bones kernel module...

------------------------------------------------------ #ifndef __KERNEL__ #define __KERNEL__ #define MODULE #include

int init_module(void) { printk("Hello, World\n"); return 0; }

void cleanup_module(void) { printk("I'm outta here...\n"); }

#endif

------------------------------------------------------

I compile with...

[blah@localhost blah] gcc -O2 -Wall -D__KERNEL__ -DMODULE

-I/usr/src/linux/include/ -c blah.c

So far no problems. I should point out that this module is intended for another system, and the sources at /usr/src/linux match that of the target. When I move blah.o to the other system, I get this...

bash-2.05# /sbin/insmod blah.o blah.o: couldn't find the kernel version the module was compiled for

Sure... let's try that again...

bash-2.05# /sbin/insmod -f blah.o blah.o: couldn't find the kernel version the module was compiled for

Could someone shed some light?? TIA

- P
- Pat Kohli
  
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posted
20 years ago

Wed, Aug 6, 2003 11:22 PM

Are you running this classic in X-Windows? If so, your "Hello, World" message should appear in /var/log/messages.

Are you wondering what you can do to make the kernel version message go away? Skip up to page 26, and try #define __NO_VERSION__ // before #include

I'm going to fire up the source for a simple driver which I was working on, and let you know if I see anything else.

I hope this works, one or the other, or both.

- Pat kohli at ameritel.net

PS, I'm assuming that you are using Rubini and Corbet's O'Reilly book as an aid. If so, what is yor impression?

- R
- Roger Larsson
  
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posted
20 years ago

Thu, Aug 7, 2003 10:34 PM

This is taken from the computer you compile at... And does not match the targets.

You should/could set up a mirror of the target in some directory (like ~/target) and then compile with

gcc -nostdinc -I ~/target/include -nostdlib ...

/RogerL

--
Roger Larsson
Skellefteå
Sweden

- J
- jahurt
  
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posted
20 years ago

Sat, Aug 9, 2003 10:02 PM

Sorry it's taken me this long to reply... I did get this to work, although I honestly don't know what I did differently to get this to work...

I know... problem was that I never got this far... the module would compile without complaint but wouldn't install, even with an '-f'

Thanks, I'll give this a shot next time this comes up (and I have a feeling it will) :)

I nearly wore that book out my senior year of college :) Also good is "Understanding the Linux Kernel' by Bovet and Cesati, although it's a bit more dated.