Re: [3/3] use vmalloc() to arrange guard pages for stacks

Bill Irwin wrote:
> This patch introduces CONFIG_DEBUG_STACK, which vmalloc()'s task and IRQ
> stacks in order to establish guard pages. In such a manner any stack
> overflow that references pages immediately adjacent to the stack is
> immediately trapped with a fault, which precludes silent memory corruption
> or difficult-to-decipher failure modes resulting from stack corruption.
> 

Is there a guard page below and above the stack? (I've seen stack underflow
before, as well as overflow.)
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