Re: RTAI module: rtai functions undefined

Did you "insmod rtai_sched.ko"?
Paolo

On 02/22/2016 09:05 AM, Junhong Liu wrote:
> 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] <mailto:[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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