active_mm and kernel threads.

["Bryan K." <ef057@hotmail.com>]

Reading the kernel source I have noticed that a kernel thread must always 
have a valid mm_struct pointer at task_struct->active_mm. This prevents the 
mm_struct to be deallocated if a kernel thread uses it. I was wandering why 
a kernel thread need a mm_struct if it is not supposed to access addresses 
below TASK_SIZE?




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