Comments follow (running kernel 2.4.9, custom.. module version info
disabled since PPP support can't be compiled into the kernel with it
on.. at least as of the original 2.4 kernels):
> This is the printk symbol name in the kernel:
> $ fgrep ' printk' /proc/ksyms
> c0115fb0 printk_R1b7d4074
that's not printk, though. That's printk_R1b7d4074 (mangled version?). My
output of the command is:
# fgrep ' printk' /proc/ksyms
c0112b10 printk
which matches my System.map file for the kernel:
# cat /boot/System.map-2.4.9 | grep printk
c0112b10 T printk
So my first point is:
1) Are you (the original poster) using a RH built kernel or a custom one
2) What kernel version are you using
3) If you are running a custom kernel, are you updating the System.map (in
/boot or wherever) when you compile the kernel. A lot of people don't,
which says that they don't know what the file is for.
> Now I set the MODVERSIONS flag so that insmod also compares the versions
> of the symbols in the modules against the version of the symbols in the
> kernel:
> gcc -c -DMODVERSIONS hello.c
>
> Now when I run insmod, it cannot resolve the printk symbol because printk
> in the module has not been mangled (no checksum included):
This works fine on my system. I was following along with the command line
above in order to compile my module. I then insmod'd it and I didn't get
any symbol dependency problems.
> # insmod hello.o
> hello.o: unresolved symbol printk
As I said.. didn't get this. Worked fine.
>
> To mangle the names of each symbol in the module, add the following line
> to your module:
> #include <linux/modversions.h>
>
> Compile your module again (specify the directory for modversions.h):
> gcc -c -DMODVERSIONS -I/usr/src/linux/include hello.c
If you have your links set correctly, then you don't need to pass the
include path here.
lrwxrwxrwx 1 root root 28 Jun 1 23:50 /usr/include/linux
-> /usr/src/linux/include/linux
lrwxrwxrwx 1 root root 26 Jun 1 23:50 /usr/include/asm
-> /usr/src/linux/include/asm
This system doesn't seem to have a mangled printk at all and everything
works well the way I have it set up. I was trying (with the above
comments) to provide some suggestions and whatnot.
Hope it helps :)
-Statux
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