In kernel 2.5, the implementation of building modules must be changed.
As fellow, i programed a test .
In kernel 2.4.20 ,it's OK!
But in kenel 2.5.72,you can see:
# insmod testdemo.o
Error inserting 'testdemo.o': -1 Unknown symbol in module
demo: no version magic, tainting kernel.
demo: Unknown symbol myprintk
Now i already installed module_init_tools 0.9.12.
can somebody tell me why?
how to resolve this problem.
thanx firstly. :)
yuan
#
# Makefile:
#
LINUX_DIR = /usr/src/lsm-2.5
#LINUX_DIR = /usr/src/linux-2.4.20-8
CC=gcc
MODCFLAGS = -D__KERNEL__ -I$(LINUX_DIR)/include
-I$(LINUX_DIR)/include/asm-i386/mach-default -Wall -DMODULE -O2
-DKBUILD_MODNAME=$* -DKBUILD_BASENAME=$* -Wstrict-prototypes -o $*.o
testdemo.o: demo.o myprintk.o
ld -m elf_i386 -r -o testdemo.o demo.o myprintk.o
demo.o: demo.c myprintkp.c $(LINUX_DIR)/include/linux/version.h
$(CC) $(MODCFLAGS) -c demo.c
myprintk.o: myprintk.c myprintk.h $(LINUX_DIR)/include/linux/version.h
$(CC) $(MODCFLAGS) -c myprintk.c
clean:
rm -f *.o *.o.d
###
/*
* demo.c
*/
#include linux/config.h
#include linux/kernel.h
#include linux/module.h
#include linux/init.h
extern int myprintk (void);
static int __init demo_init(void) {
printk(initializing..\n);
myprintk();
return 0;
}
static void __exit demo_exit(void) {
printk(goodbye!\n);
}
module_init(demo_init);
module_exit(demo_exit);
MODULE_LICENSE(GPL);
###
/*
* myprintk.c
*/
#include linux/version.h
#include linux/config.h
#include linux/module.h
#include linux/kernel.h
#include linux/init.h
#include myprintk.h
static int myprintk (void)
{
printk(KERN_INFO This is my printk!\n);
return 0;
}
##
/*
* myprintk.h
*/
#define MODULE_NAME HELLO
static int myprintk (void);
###
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