Adding custom ("Hello") system call: help

[courteous]

I'm trying to add a custom ("Hello world" :o) system call.
In /usr/src/linux/hello/ I put simple hello.c ...

#include "linux/linkage.h" // for linking a system call
#include "linux/kernel.h" // for "printk"

asmlinkage int sys_hello() 
{
	printk(KERN_ALERT "Hello!");
	return 1;
}

... and in home directory helloTest.c:

#include <stdio.h>
#include <sys/syscall.h>
#include <linux/unistd.h>

#define __NR_hello	338

int main()
{
	syscall(__NR_hello);
	return 0;
}

I compiled helloTest.c and ran ./a.out: in /var/log/messages nothing gets written!

Before "compile & install & reboot" I did these steps (linux is symbolic link to linux-2.6.35.10):

1. In /usr/src/linux/arch/x86/include/asm/unistd_32.h, I've added/changed:

   #define __NR_hello	 338
   #define __NR_syscalls	 339

2. In /usr/src/linux/arch/x86/kernel/syscall_table.S, I've added (on the last line):

   .long sys_hello

3. In /usr/src/linux/hello, I've created a Makefile:

   obj-y += hello.o

   ... and in /usr/src/linux, I've modified Makefile and added hello/ directory:

   core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ hello/

4. In /usr/src/linux/include/linux/syscalls.h, I've added (on the last line):

   asmlinkage long sys_hello(void)

[courteous]

I've checked System.map (in /boot directory) and 'hello' is indeed there:

c015c3c0 T sys_hello

Does that imply that something is wrong with my test call, helloTest.c?

EDIT: dmesg* does print "Hello!" on the last line, but there is nothing in /var/log/messages file.


* dmesg - prints or controls the kernel ring buffer