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Hi,
I have one kernel module ( one file ) mod.c
I want to divide this in some files.
lib1.h
lib1.c
lib2.h
lib2.c
mod.c
Please help me to write Makefile.
I have now this
CFLAGS= -Wall
obj-m := mod.o
KDIR := /lib/modules/$(shell uname -r)/build
PWD := $(shell pwd)
default:
$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
but I dont understand what exactly "obj-m := mod.o" do in this file
I tried to write obj-m := mod.o lib2.o lib1.o
but when I tried use some function from lib2/lib1
in mod.c there are
WARNING: "testfunction" [/root/mod.ko] undefined!
I tried both #include "lib1.h" or extern int testfunction(int);
Ok I solve my problem with
Ok I solve my problem with
mod-objs := lib1.o lib2.o
thx
mmmmm I thought that I solve
mmmmm I thought that I solve my problem but not
obj-m := mod.o
mod-objs := lib1.o
KDIR := /lib/modules/$(shell uname -r)/build
PWD := $(shell pwd)
default:
$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
IT's work this mean There is no compilation error and warnings
zet modulANDlibs # make
make -C /lib/modules/2.6.18-gentoo-r2/build SUBDIRS=/root/modulANDlibs modules
make[1]: Entering directory `/usr/src/linux-2.6.18-gentoo-r2'
CC [M] /root/modulANDlibs/lib1.o
LD [M] /root/modulANDlibs/mod.o
Building modules, stage 2.
MODPOST
CC /root/modulANDlibs/mod.mod.o
LD [M] /root/modulANDlibs/mod.ko
make[1]: Leaving directory `/usr/src/linux-2.6.18-gentoo-r2'
zet modulANDlibs #
but this is very strange dosn't matter what is in the mod.c file
the output mod.ko have 1.6K and it can be load by
insmod mod.ko
but nothing works ( printk etc. )
When I compile the same modul without any lib*
it works fine ( printk etc )
One adsitional
One adsitional information.
After module is loaded to kernel In /proc/kallsyms
there are symbols form [mod] for example testfunction
but still module doesnt work
Please help me guys. I realy need help I am desperated :)
Ever tried adapting one of
Ever tried adapting one of Jonathan Corbet's examples ? Look for examples from O'Reilly's LDD v3. I can provide it to you if you can't find it (the examples are mostly dual GPL/BSD licenses)
Thx I read one sentence from
Thx I read one sentence from Chapter 02 of LDD v3 and this help my mind to understand :)
The right solution is
obj-m := new_virtual_name_of_module.o
new_virtual_name_of_module-objs := mod.o lib1.o lib2.o
Thx again :)