i am trying to write a chardev..module for major 254. i do the register_chrdev(major, "modulename"); in the init_module ..
in fileoperations i used a function for examle "my_write" for writing, "my_read" for reading.
and so on.. in my_open function. i register the devices with the minor numbers. every thing is normal.. but when specifying whether the device opened for writing, i used semaphore for it. like this..
if(down_interruptable(&dev->semaphore))
{
return -ERESTARTSYS;
}
.
.
.
up(&dev->semaphore);
everything is ok unless i use these block. in case i use with semaphore, that is what i should when writing in shared mem, Paging ooopss outcome. there is no problem with the
compilation
gcc -c -D__KERNEL__ -D__MODULE__ my_module.c
i use these flags and no need to use __SMP__ flag..
if there is any kind of help, it is welcomed..
At the beginning of module writing steps, to face such a problem is discouraging..
sincereley
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