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2.6.0-test3 module compilation

DISCUSSION [email protected] 4 participants 4 messages Aug 20, 2003

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#0 lore raw

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

#1 lore raw

On Wed, 20 Aug 2003 18:39:19 +0200 (CEST) <[email protected]> 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 :(

Please wrap lines near 70-72 characters.

Can you try a Makefile and instructions like this?

# makefile for dummy module
# usage:
# cd /path/to/kernel/source && make SUBDIRS=/path/to/source/dummymod/ modules

obj-m := dummy.o

clean-files := *.o

--
~Randy [MOTD: Always include kernel version.]
"Everything is relative."

#2 lore raw
In reply to [email protected]
Quoted 18 lines · On Wed, 20 Aug 2003 [email protected] 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 :(

Quoted 2 lines

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.