error: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS ????

when i compile my file the following error message is generated:
-------------------------------------
Build target 'Target 1'
compiling robo.c...
linking...
*** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS
SEGMENT: ?PR?_REVERSE?ROBO

creating hex file from "robot"...
"robot" - 0 Error(s), 1 Warning(s).
--------------------------------------
what does this warning mean ?
will my program run smoothly if i write this hex file to my microcontroller ?

Following is the source of my program:
#include <REG52.H>
#include <stdio.h>
#include <intrins.h>
unsigned char speedleft,speedright,speed=20;
unsigned char high,low,flag,time=500;

void delay (unsigned char c)
{
do {
_nop_(); _nop_();
}
while (--c);
}

Forward(char speed)
{
P1=0x64;
speedright = speed+10;
speedleft = speed;
delay(time);
}

TurnRight()
{
P1=0x68;
speedright = low+5;
speedleft = low;
delay(time);
}

TurnLeft()
{
P1=0x54;
speedright = low+5;
speedleft = low;
delay(time);
}

Reverse(char speed)
{
P1=0x58;
speedright = speed;
speedleft = speed+5;
delay(time);
}

Run()
{
char sensors;
sensors = (P3 &=0x0f);

if((sensors & 0x01)==0)
{
TurnRight();
flag = 1;
}
else if((sensors & 0x08)==0)
{
TurnLeft();
flag = 2;
} else if(sensors == 0x09)
{
Forward(high);
flag = 0;
} else if(((sensors==0x0b)||(sensors==0x0d))&&(flag==0))
Forward(low);
}

main()
{
P1=0x40;
P3=0xff;
high = 80;
low = 30;
flag = 0;

while(1)
{
P3|= 0x0f;
Run();
}
}