[asveikau]

This is kind of bad to do in a kernel. It is up to you to map the pages of your own stack. Once you have higher level concepts like a process, it's fair for the kernel to look at that state from a privileged position and say "OK, I will allocate more stack pages as it faults, and kill the process if I fail or it goes too far". But for kernel mode code, that last part could lead you to a scary place. IMO it's better to just use a few pages for stack and not go crazy with recursive functions.

[tjdetwiler]

Plus if you have your kernel stacks allocated in the same virtual address space, you might not be able to just "grow the stack" since that memory may be in use.

But yes recursion in a kernel is a "bad thing" unless you know the recursive bound.