[rtl] problem in allocating memory in kernel

[chenjianchun6127]

hi,all

In my program, memory (by using kmalloc) is allocated to  form a chain table  in  
kernel(RTLinux v3.1):

code in kernel:
int allocate_mem(unsigned int fifo)
{
......
p0=(struct Head_Struct *)kmalloc(HEAD_LEN_SIZE);
......
}

int init_module(void)
{
.....
rtf_create_handler(PLC_DATA_FIFO, &allocate_mem);
.....
}

code in userspace:
write(fd1,p,HEAD_LEN_SIZE);

it works well if the chain table is short, But if the chain table is longer ,there is 
an error: segmentation fault.
why?

chen 



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