[PATCH] attr.c in _STACK_GROWS_UP case.

[Roland McGrath]

> Not possible, the stack is the last vma. It grows until all of memory is
> exhausted. Your previous recommendation was the best solution for S_G_D.

I don't think you should assume this.  The kernel might have special vmas
in the highest parts of memory some day (user fixmap area and such) on
grows-up platforms, as it does now on some (grows-down) platforms.