[PATCH] ia64: max user stack size of main thread configurable via RLIMIT_STACK
Make the size of the user stack based on the stack rlimit. The stack hard stack size now defaults to 2GB, but can be increased with ulimit up to 1/2 of the max mappable space in a region. For 16k pages, this makes the max stack size 8TB.
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include/asm-ia64/ustack.h
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