>  - that "else" looks wrong. At least conceptually, both could happen -
quoted text
> the code should be entirely able to handle a segment that expands both
> ways (which is something that ia64 could do: stack one way, register
> spills etc other, all in just one happy vma). I guess we don't set it
> up that way now, but the "else" just annoys my sense of aesthetics.
> It's an extra four letters that don't add value - just takes it away.

Conceptually yes we could - I don't suppose we ever will as keeping
separate vmas for stack and RSE stack defends against underflow in
a program that has totally messed up.  But I can save 4 bytes of
source code and drop the "else".

quoted text
> - The "address = PAGE_ALIGN(address + 1);" thing is just ugly.
> Wouldn't it be nicer to just move the earlier
>
>  address &= PAGE_MASK

This mask might be redundant ... I didn't look at the call
sequence, but I've observed that "address" happens to be page
aligned in all my tests.

quoted text
> back outside the conditionals (and keep the original conditional the
> way it was - you only changed it for that bogus "else" case anyway),
> and then do
>
>  if (address + PAGE_SIZE == vma->vm_end)
>
> rather than have "PAGE_ALIGN(address + 1)" as yet another way of
> aligning the address just right.

Yes, that works too.

Coding revised version now.

-Tony
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