problem with my first kernel module,help

[alexzhengyi]

I'm new to freebsd,and I try my first hello world kernel module,I
got the following error on compilatiuon:

Warning: Object directory not changed from original /usr/home/alex/src/kernel/hello
cc -O2 -fno-strict-aliasing -pipe -D_KERNEL -DKLD_MODULE -std=c99 -nostdinc -I. -I@ -I@/contrib/altq -finline-limit=8000 --param inline-unit-growth=100 --param large-function-growth=1000 -fno-common -mno-align-long-strings -mpreferred-stack-boundary=2 -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -mno-sse3 -ffreestanding -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual -Wundef -Wno-pointer-sign -fformat-extensions -c hello.c
ld -d -warn-common -r -d -o .kld hello.o
:> export_syms
awk -f /sys/conf/kmod_syms.awk .kld export_syms | xargs -J% objcopy % .kld
ld -Bshareable -d -warn-common -o .ko hello
.kld
*** Error code 1

Stop in /usr/home/alex/src/kernel/hello.


And my source code:
#include <sys/param.h>
#include <sys/module.h>
#include <sys/kernel.h>
#include <sys/systm.h>

static int load(struct module *module, int cmd, void *arg)
{
int error = 0;

switch (cmd)
{
case MOD_LOAD:
{
uprintf("hello world!\n");
break;
}
case MOD_UNLOAD:
{
uprintf("bye bye world\n");
break;
}
default:
{
error = EOPNOTSUPP;
break;
}
}

return error;
}

static moduledata_t hello_mod = {
"hello",
load,
NULL
};

DECLARE_MODULE(hello, hello_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);


Makefile:
KMOD = hello
SRCS = hello.c

.include <bsd.kmod.mk>

[graudeejs]

use code tags, it will make your source much more readable

[alexzhengyi]

it'a not the fault of the code, I have already got the object file hello.o, but when generate hello.ko,it failed

[alexzhengyi]

I have fixed it myself.