Re: RTAI module: rtai functions undefined

Hello! I have something positive to tell, which is the example from
showroom/user/latency works just fine on my system. Could somebody help me
with this MODULE program, I really need it to work in my WORK. Thank you
very much.
Junhong

On Sat, Feb 20, 2016 at 4:59 AM, Junhong Liu <[email protected]>
wrote:

> Hello, Paolo,
>
> Thank you  very much! This short program is a miniature from the showroom
> /kern/latency. For simplicity and clarity, only a few codes are included
> while the symptom is the same.
>
> 1. the short program is now called "latency.h":
>
> // ------ rtProcess.c ----- define MODULE
>
> #include <linux/kernel.h> /* Needed for KERN_INFO */
> #include <linux/module.h>  /*Needed by all modules*/
> #include <linux/moduleparam.h>
> #include <linux/init.h> /* Needed for the macros */
> #include <linux/stat.h>
> #include <linux/proc_fs.h>
> #include <linux/stringify.h>
> #include <asm/io.h>
> #include <linux/errno.h>   /*EINVAL, ENOMEN*/
>
> #include <rtai.h> // RTAI configuration switches
> #include <rtai_sched.h>
> #include <rtai_sem.h>  // RTAI semaphores
> #include <rtai_fifos.h>
> #include <rtai_proc_fs.h>
>
> MODULE_LICENSE("GPL");
>
> #define TICK_PERIOD 1000000
> #define TASK_PRIORITY 1
> #define STACK_SIZE 1024
> #define FIFO 0
>
> static int __latency_init(void) // entry point
> {
>     // ---1---
>     rt_set_oneshot_mode();
>     start_rt_timer(1); // the execution starts
>     // ---1---
>     printk("Hello in INIT!\n");
>
>     return 0;
> }
>
> static void __latency_exit(void)
> {
>      // ---2---
>     stop_rt_timer(); rt_busy_sleep(10000000);
>     // ---2---
>
>     printk("Goodbye & EXIT!\n");
>     return;
> }
>
> module_init(__latency_init);
> module_exit(__latency_exit);
>
> 2. The "Makefile" is:
> #Makefile
>
> #RTAI_CFLAGS += $(shell rtai-config --lxrt-cflags)
> # # -I. -I/usr/realtime/include -Wall -Wstrict-prototypes -pipe
>
> #RTAI_LIBFLAGS += $(shell rtai-config --lxrt-ldflags )
> # -L/usr/realtime/lib -llxrt -lpthread
> rtai_srctree := /usr/src/rtai
> EXTRA_CFLAGS += -I$(LINUX)/include -D__KERNEL__ -DMOUDLE -O2
> EXTRA_CFLAGS += $(shell rtai-config --module-cflags) -msse \
>         -I/usr/realtime/include -D__IN_RTAI__ \
>         -I$(rtai_srctree)/base/include \
>         -mpreferred-stack-boundary=4
>
> KBUILD_EXTRA_SYMBOLS := $(shell rtai-config
> --prefix)/modules/Module.sysmvers
>
> obj-m += latency.o
>
> CURRENT = $(shell uname -r)
>     KDIR ?= /lib/modules/$(CURRENT)/build
>     PWD := $(shell pwd)
>
> modules:
>     $(MAKE) -C $(KDIR) M=$(PWD) modules
>
> modules_install:
>     $(MAKE) -C $(KDIR) M=$(PWD) modules_install
>
> clean:
>     $(MAKE) -C  $(KDIR) M=$(PWD) clean
>
> 3. By "make" as:
>  root@huapeng-GA-990XA-UD3:/home/huapeng/Yritys/RT/latency# make, the
> following message comes:
> root@huapeng-GA-990XA-UD3:/home/huapeng/Yritys/RT/latency# make
> make -C /lib/modules/3.10.32-rtai/build M=/home/huapeng/Yritys/RT/latency
> modules
> make[1]: Entering directory `/usr/src/linux-headers-3.10.32-rtai'
>   CC [M]  /home/huapeng/Yritys/RT/latency/latency.o
> <command-line>:0:0: warning: "_FORTIFY_SOURCE" redefined [enabled by
> default]
> <built-in>:0:0: note: this is the location of the previous definition
>   Building modules, stage 2.
>   MODPOST 1 modules
> WARNING: "rt_busy_sleep" [/home/huapeng/Yritys/RT/latency/latency.ko]
> undefined!
> WARNING: "stop_rt_timer" [/home/huapeng/Yritys/RT/latency/latency.ko]
> undefined!
> WARNING: "start_rt_timer" [/home/huapeng/Yritys/RT/latency/latency.ko]
> undefined!
> WARNING: "rt_set_oneshot_mode"
> [/home/huapeng/Yritys/RT/latency/latency.ko] undefined!
>   LD [M]  /home/huapeng/Yritys/RT/latency/latency.ko
> make[1]: Leaving directory `/usr/src/linux-headers-3.10.32-rtai'
> root@huapeng-GA-990XA-UD3:/home/huapeng/Yritys/RT/latency# make
> make -C /lib/modules/3.10.32-rtai/build M=/home/huapeng/Yritys/RT/latency
> modules
> make[1]: Entering directory `/usr/src/linux-headers-3.10.32-rtai'
>   CC [M]  /home/huapeng/Yritys/RT/latency/latency.o
> <command-line>:0:0: warning: "_FORTIFY_SOURCE" redefined [enabled by
> default]
> <built-in>:0:0: note: this is the location of the previous definition
>   Building modules, stage 2.
>   MODPOST 1 modules
> WARNING: "rt_busy_sleep" [/home/huapeng/Yritys/RT/latency/latency.ko]
> undefined!
> WARNING: "stop_rt_timer" [/home/huapeng/Yritys/RT/latency/latency.ko]
> undefined!
> WARNING: "start_rt_timer" [/home/huapeng/Yritys/RT/latency/latency.ko]
> undefined!
> WARNING: "rt_set_oneshot_mode"
> [/home/huapeng/Yritys/RT/latency/latency.ko] undefined!
>   CC      /home/huapeng/Yritys/RT/latency/latency.mod.o
> <command-line>:0:0: warning: "_FORTIFY_SOURCE" redefined [enabled by
> default]
> <built-in>:0:0: note: this is the location of the previous definition
>   LD [M]  /home/huapeng/Yritys/RT/latency/latency.ko
> make[1]: Leaving directory `/usr/src/linux-headers-3.10.32-rtai'
> root@huapeng-GA-990XA-UD3:/home/huapeng/Yritys/RT/latency#
>
> 4. Do "insmod" in two ways and receive the following info:
> root@huapeng-GA-990XA-UD3:/home/huapeng/Yritys/RT/latency# insmod
> latency.ko
> insmod: ERROR: could not insert module latency.ko: Unknown symbol in module
> root@huapeng-GA-990XA-UD3:/home/huapeng/Yritys/RT/latency# insmod
> ./latency.ko
> insmod: ERROR: could not insert module ./latency.ko: Unknown symbol in
> module
>
> By "dmesg|tail", obtain:
> root@huapeng-GA-990XA-UD3:/home/huapeng/Yritys/RT/latency# dmesg|tail
> [16666.583390] I-pipe: head domain RTAI unregistered.
> [16666.634074] RTAI[hal]: unmounted.
> [20291.607043] latency: Unknown symbol rt_busy_sleep (err 0)
> [20291.607082] latency: Unknown symbol start_rt_timer (err 0)
> [20291.607112] latency: Unknown symbol stop_rt_timer (err 0)
> [20291.607142] latency: Unknown symbol rt_set_oneshot_mode (err 0)
> [20305.727466] latency: Unknown symbol rt_busy_sleep (err 0)
> [20305.727504] latency: Unknown symbol start_rt_timer (err 0)
> [20305.727534] latency: Unknown symbol stop_rt_timer (err 0)
> [20305.727564] latency: Unknown symbol rt_set_oneshot_mode (err 0)
> root@huapeng-GA-990XA-UD3:/home/huapeng/Yritys/RT/latency#
>
> By only "dmesg", obtain huge amount of information, selected ALL and saved
> into a file "latencyKOdmesg" attached (too long to be in the email body)
>
> Your ideas will be  greatly appreciated!
>
> Junhong
>
>
>
>
>
>

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