Andreas Kling 5e01ebfc56 Kernel: Clean up thread stacks when a thread dies ...

We were forgetting where we put the userspace thread stacks, so added a
member called Thread::m_userspace_thread_stack to keep track of it.

Then, in ~Thread(), we now deallocate the userspace, kernel and signal
stacks (if present.)

Out of curiosity, the "init_stage2" process doesn't have a kernel stack
which I found surprising. :^)

2019-08-01 20:17:12 +02:00

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