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SubjectRe: 2.6.0-test3 module compilation
On Wed, 20 Aug 2003 linuxmodule@altern.org wrote:

> I am trying to compile a module on 2.6.0-test3 kernel. The makefile i
> am using is a pretty normal one :
>
> CFLAGS = -D__KERNEL__ -DMODULE -I/usr/src/linux-2.6.0-test3/include -O
> dummy.o: dummy.c
>
> The module i am trying to compile is taken from the kernel itself
> (dummy network device driver). The
> compilation works flawlessly but when i try to insert the module i get
> : invalid module format.
> What am i doing wrong because i have modutils and module-init and both
> work, since the same module (dummy)
> compiled with the kernel itself can be inserted and removed
> without the previous error message.
> Is there something i should know about the compilation process ?
> The kernel-compiled module (dummy.ko) has
> about 10 Kbytes and dummy.ko compiled by me has only 2 Kbytes :(
>
> Thank you in advance
> Snowdog

I can't tell how CFLAGS is being used (with the colon???).
Anyway, the correct way to build the module (for 2.4.20) is:

Script started on Wed Aug 20 13:09:15 2003
# gcc -c -o dummy.o -DMODULE -D__KERNEL__ -O2 \
-I/usr/src/linux-2.4.20/include dummy.c
You have new mail in /var/spool/mail/root

# insmod dummy.o
# lsmod
Module Size Used by
dummy 1052 0 (unused)
vximsg 3784 0 (autoclean)
vxidrvr 1548 0 (autoclean)
st 29592 0 (autoclean) (unused)
nfs 47848 0 (autoclean)
lockd 37244 0 (autoclean) [nfs]
sunrpc 63228 0 (autoclean) [nfs lockd]
ipchains 41400 7
3c59x 28224 1 (autoclean)
nls_cp437 4376 4 (autoclean)
isofs 17232 0 (unused)
loop 8632 0
sr_mod 11964 0 (unused)
cdrom 27936 0 [sr_mod]
BusLogic 35768 7
sd_mod 10184 14
scsi_mod 54572 4 [st sr_mod BusLogic sd_mod]
# ifconfig dummy0 1.2.3.4
# ifconfig
dummy0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
inet addr:1.2.3.4 Bcast:1.255.255.255 Mask:255.0.0.0
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0

eth0 Link encap:Ethernet HWaddr 00:50:DA:19:7A:7D
inet addr:10.100.2.224 Bcast:10.255.255.255 Mask:255.0.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3959973 errors:0 dropped:0 overruns:0 frame:0
TX packets:442389 errors:0 dropped:0 overruns:0 carrier:0
collisions:22249 txqueuelen:100
Interrupt:10 Base address:0xb800

eth0:1 Link encap:Ethernet HWaddr 00:50:DA:19:7A:7D
inet addr:10.106.100.167 Bcast:10.255.255.255 Mask:255.0.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:10 Base address:0xb800

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:7722 errors:0 dropped:0 overruns:0 frame:0
TX packets:7722 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0

You have new mail in /var/spool/mail/root
# rmmod dummy
# exit
exit

Script done on Wed Aug 20 13:11:53 2003


...and it works.


Cheers,
Dick Johnson
Penguin : Linux version 2.4.20 on an i686 machine (797.90 BogoMips).
Note 96.31% of all statistics are fiction.


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