Messages in this thread | | | Date | Sat, 7 May 2005 06:19:28 -0700 (PDT) | From | li nux <> | Subject | compiling "hello world" kernel module on 2.6 kernel |
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I have written a minimal hello world kernel module. (see the Makefile and hello.c below) But I am not able to build it using the kernel build system.Any idea why this is happening.
I referred "Chapter 2: Building and Running Modules" of http://www.oreilly.com/catalog/linuxdrive3/book/index.csp
I am using SLES9 My kernel sources are at /local/usr/linux-2.6.5-7.162 This is the kernel i am running.
On doing a make it gives me following output, but does not build hello.o ---------------------------------------------- $ make make -C /lib/modules/2.6.5-7.162-bigsmp/build M=/local/usr/linux-2.6.5-7.162 modules make[1]: Entering directory `/local/usr/linux-2.6.5-7.162' Building modules, stage 2. MODPOST make[1]: Leaving directory `/local/usr/linux-2.6.5-7.162' -------------------------------------------------- This is my Makefile:
# If KERNELRELEASE is defined, we've been invoked from # the kernel build system and can use its language. ifneq ($(KERNELRELEASE),) obj-m := hello.o
# Otherwise we were called directly from the command # line; invoke the kernel build system. else KERNELDIR ?= /lib/modules/$(shell uname -r)/build PWD := $(shell pwd)
default: $(MAKE) -C $(KERNELDIR) M=$(PWD) modules endif --------------------------------------------------- hello.c
#include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/version.h> #include <linux/vermagic.h>
static int __init hello_init (void) { printk("module hello loading"); return 0; }
static void __exit hello_exit (void) { printk("module hello exiting"); }
module_init(hello_init); module_exit(hello_exit); MODULE_LICENSE ("GPL"); --------------------------------------------------
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