Re: [2/6] add config option to vmalloc stacks (was: Re: [-mm patch] i386: enable 4k stacks by default)

So if you want to invest some time into getting this into mergeable
shape I'd suggest you redo the patch series in the following way:

patch 1: dynamic allocated irq stacks
patch 2: make irqstacks unconditional, but allow selecting 4/8k stacks
patch 3: introduce a DEBUG_STACK option that enables vmalloc'ed stacks
and adds the __pa check.
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