Re: [PATCH][RFC] 4K stacks default, not a debug thing any more...?

[Alan Cox]

> Why do the two pages have to be physically contiguous?  The stack just 
> needs to be two contiguous pages in virtual memory, but they can map to 
> any two pages anywhere in physical memory.

Historically we allowed DMA off the stack on old x86 systems. Removing
that while a good idea would take a lot of auditing. We also have a very
limited vmalloc window for mapped pages and filling that with stacks
would be bad.
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