LinuxLists.cc - 2.6.0-t1: problems with modules

2003-07-15 09:21:27

Subject: 2.6.0-t1: problems with modules

Hi there!

I try to compile my driver for 2.6.0-t1.

I can insmod 2 modules out of 3, and i dont know why the 3rd fails.

Changes I did for 2.6.0-t1 to my driver:
- added -DKBUILD_MODNAME=<name>
- renamed MINOR() to minor()
- removed MOD_INC/DEC_USE_COUNT
- removed MODULE_PARM*

---------------------------------
A module thats working:
gcc:
gcc -Wall -O3 -finline-functions -Wstrict-prototypes -falign-functions=4
-I/lib/modules/2.6.0-test1-ac1/build/include
-I/lib/modules/2.6.0-test1-ac1/build/include/asm/mach-default -I./include
-D__KERNEL__ -DMODULE -DEXPORT_SYMTAB -DKBUILD_MODNAME=working -c working.c -o
working.o

insmod:
# insmod ./working.o

kmsg:
Jul 15 11:26:28 phoebee working: no version magic, tainting kernel.
Jul 15 11:26:28 phoebee working: module license 'TechnoTrend' taints kernel.

objdump -h:
# objdump -h working.o
working.o: file format elf32-i386
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 00000166 00000000 00000000 00000040 2**4
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
1 .data 00000078 00000000 00000000 000001c0 2**5
CONTENTS, ALLOC, LOAD, RELOC, DATA
2 .bss 00000018 00000000 00000000 00000238 2**2
ALLOC
3 .gnu.linkonce.this_module 00000200 00000000 00000000 00000280 2**7
CONTENTS, ALLOC, LOAD, RELOC, DATA, LINK_ONCE_DISCARD
4 .modinfo 0000004a 00000000 00000000 00000480 2**5
CONTENTS, ALLOC, LOAD, READONLY, DATA
5 .rodata.str1.1 0000004c 00000000 00000000 000004ca 2**0
CONTENTS, ALLOC, LOAD, READONLY, DATA
6 .rodata.str1.32 00000025 00000000 00000000 00000520 2**5
CONTENTS, ALLOC, LOAD, READONLY, DATA
7 .init.text 000000d8 00000000 00000000 00000550 2**4
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
8 .exit.text 0000006a 00000000 00000000 00000630 2**4
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
9 .comment 00000042 00000000 00000000 0000069a 2**0
CONTENTS, READONLY
--------------------------------
The module thats not working:
gcc:
gcc -Wall -O3 -finline-functions -Wstrict-prototypes -falign-functions=4
-I/lib/modules/2.6.0-test1-ac1/build/include
-I/lib/modules/2.6.0-test1-ac1/build/include/asm/mach-default -I./include
-D__KERNEL__ -DMODULE -DEXPORT_SYMTAB -DKBUILD_MODNAME=not_working -c
not_working.c -o not_working.o

insmod:
# insmod ./not_working.o
Error inserting './not_working.o': -1 Invalid module format

kmsg:
Jul 15 11:27:55 phoebee not_working: no version magic, tainting kernel.
Jul 15 11:27:55 phoebee not_working: module license 'TechnoTrend' taints kernel.

objdump -h:
# objdump -h not_working.o
not_working.o: file format elf32-i386
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 00000bb3 00000000 00000000 00000040 2**4
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
1 .data 00000080 00000000 00000000 00000c00 2**5
CONTENTS, ALLOC, LOAD, RELOC, DATA
2 .bss 00000004 00000000 00000000 00000c80 2**2
ALLOC
3 .gnu.linkonce.this_module 00000200 00000000 00000000 00000c80 2**7
CONTENTS, ALLOC, LOAD, RELOC, DATA, LINK_ONCE_DISCARD
4 .modinfo 0000004a 00000000 00000000 00000e80 2**5
CONTENTS, ALLOC, LOAD, READONLY, DATA
5 .rodata.str1.32 00000378 00000000 00000000 00000ee0 2**5
CONTENTS, ALLOC, LOAD, READONLY, DATA
6 .rodata.str1.1 0000000c 00000000 00000000 00001258 2**0
CONTENTS, ALLOC, LOAD, READONLY, DATA
7 .rodata 0000004c 00000000 00000000 00001264 2**2
CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
8 .fixup 00000068 00000000 00000000 000012b0 2**0
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
9 __ex_table 00000040 00000000 00000000 00001318 2**2
CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
10 .init.text 000000cc 00000000 00000000 00001360 2**4
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
11 .exit.text 00000050 00000000 00000000 00001430 2**4
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
12 .comment 00000042 00000000 00000000 00001480 2**0
CONTENTS, READONLY
--------------------------------

What is wrong with the not_working.o?
And do I have to use try_module_get(mod) & module_put(mod) since
MOD_INC/DEC_USE_COUNT are deprecated?
What about the MODULE_PARM? any replacement?

Sorry if I'm asking already answered questions.

Regards,
Martin

--
MyExcuse:
backup tape overwritten with copy of system manager's favourite CD

Martin Zwickel <[email protected]>
Research & Development

TechnoTrend AG <http://www.technotrend.de>

Attachments:

(No filename) (189.00 B)

2003-07-16 15:20:45

by Randy.Dunlap

[permalink] [raw]

Subject: Re: 2.6.0-t1: problems with modules

On Tue, 15 Jul 2003 11:36:10 +0200 Martin Zwickel <[email protected]> wrote:

| Hi there!
|
| I try to compile my driver for 2.6.0-t1.
|
| I can insmod 2 modules out of 3, and i dont know why the 3rd fails.
|
| Changes I did for 2.6.0-t1 to my driver:
| - added -DKBUILD_MODNAME=<name>
| - renamed MINOR() to minor()
| - removed MOD_INC/DEC_USE_COUNT
| - removed MODULE_PARM*
|
| ---------------------------------
| A module thats working:
| gcc:
| gcc -Wall -O3 -finline-functions -Wstrict-prototypes -falign-functions=4
| -I/lib/modules/2.6.0-test1-ac1/build/include
| -I/lib/modules/2.6.0-test1-ac1/build/include/asm/mach-default -I./include
| -D__KERNEL__ -DMODULE -DEXPORT_SYMTAB -DKBUILD_MODNAME=working -c working.c -o
| working.o

Use correct build/make for 2.5/2.6. See linux/Documentation/modules.txt
and linux/Documentation/kbuild/makefiles.txt .

It's very simple and works well.

| insmod:
| # insmod ./working.o

You should insmod working.ko, not working.o .
(after building modules correctly)

| kmsg:
| Jul 15 11:26:28 phoebee working: no version magic, tainting kernel.
| Jul 15 11:26:28 phoebee working: module license 'TechnoTrend' taints kernel.
|
| objdump -h:
| # objdump -h working.o
| working.o: file format elf32-i386
| Sections:
| Idx Name Size VMA LMA File off Algn
| 0 .text 00000166 00000000 00000000 00000040 2**4
| CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
| 1 .data 00000078 00000000 00000000 000001c0 2**5
| CONTENTS, ALLOC, LOAD, RELOC, DATA
| 2 .bss 00000018 00000000 00000000 00000238 2**2
| ALLOC
| 3 .gnu.linkonce.this_module 00000200 00000000 00000000 00000280 2**7
| CONTENTS, ALLOC, LOAD, RELOC, DATA, LINK_ONCE_DISCARD
| 4 .modinfo 0000004a 00000000 00000000 00000480 2**5
| CONTENTS, ALLOC, LOAD, READONLY, DATA
| 5 .rodata.str1.1 0000004c 00000000 00000000 000004ca 2**0
| CONTENTS, ALLOC, LOAD, READONLY, DATA
| 6 .rodata.str1.32 00000025 00000000 00000000 00000520 2**5
| CONTENTS, ALLOC, LOAD, READONLY, DATA
| 7 .init.text 000000d8 00000000 00000000 00000550 2**4
| CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
| 8 .exit.text 0000006a 00000000 00000000 00000630 2**4
| CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
| 9 .comment 00000042 00000000 00000000 0000069a 2**0
| CONTENTS, READONLY
| --------------------------------
| The module thats not working:
| gcc:
| gcc -Wall -O3 -finline-functions -Wstrict-prototypes -falign-functions=4
| -I/lib/modules/2.6.0-test1-ac1/build/include
| -I/lib/modules/2.6.0-test1-ac1/build/include/asm/mach-default -I./include
| -D__KERNEL__ -DMODULE -DEXPORT_SYMTAB -DKBUILD_MODNAME=not_working -c
| not_working.c -o not_working.o
|
| insmod:
| # insmod ./not_working.o
| Error inserting './not_working.o': -1 Invalid module format
|
| kmsg:
| Jul 15 11:27:55 phoebee not_working: no version magic, tainting kernel.
| Jul 15 11:27:55 phoebee not_working: module license 'TechnoTrend' taints kernel.
|
| objdump -h:
| # objdump -h not_working.o
| not_working.o: file format elf32-i386
| Sections:
| Idx Name Size VMA LMA File off Algn
| 0 .text 00000bb3 00000000 00000000 00000040 2**4
| CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
| 1 .data 00000080 00000000 00000000 00000c00 2**5
| CONTENTS, ALLOC, LOAD, RELOC, DATA
| 2 .bss 00000004 00000000 00000000 00000c80 2**2
| ALLOC
| 3 .gnu.linkonce.this_module 00000200 00000000 00000000 00000c80 2**7
| CONTENTS, ALLOC, LOAD, RELOC, DATA, LINK_ONCE_DISCARD
| 4 .modinfo 0000004a 00000000 00000000 00000e80 2**5
| CONTENTS, ALLOC, LOAD, READONLY, DATA
| 5 .rodata.str1.32 00000378 00000000 00000000 00000ee0 2**5
| CONTENTS, ALLOC, LOAD, READONLY, DATA
| 6 .rodata.str1.1 0000000c 00000000 00000000 00001258 2**0
| CONTENTS, ALLOC, LOAD, READONLY, DATA
| 7 .rodata 0000004c 00000000 00000000 00001264 2**2
| CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
| 8 .fixup 00000068 00000000 00000000 000012b0 2**0
| CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
| 9 __ex_table 00000040 00000000 00000000 00001318 2**2
| CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
| 10 .init.text 000000cc 00000000 00000000 00001360 2**4
| CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
| 11 .exit.text 00000050 00000000 00000000 00001430 2**4
| CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
| 12 .comment 00000042 00000000 00000000 00001480 2**0
| CONTENTS, READONLY
| --------------------------------
|
| What is wrong with the not_working.o?

Don't know exactly, but insmod not_working.ko after it is built.

| And do I have to use try_module_get(mod) & module_put(mod) since
| MOD_INC/DEC_USE_COUNT are deprecated?
| What about the MODULE_PARM? any replacement?

Here is the FAQ for 2.5/2.6 modules:
http://www.kernel.org/pub/linux/kernel/people/rusty/modules/FAQ

| Sorry if I'm asking already answered questions.

--
~Randy

2003-07-17 09:35:06

by Martin Zwickel

[permalink] [raw]

Subject: Re: 2.6.0-t1: problems with modules

Thanks for the hints!
Got it working now. (well, not the way i supposed to do, but it works... :)

Regards,
Martin

ps.: the kbuild system is strange

--
MyExcuse:
waste water tank overflowed onto computer

Martin Zwickel <[email protected]>
Research & Development

TechnoTrend AG <http://www.technotrend.de>

Attachments:

(No filename) (189.00 B)