Linus Torvalds wrote:
> At the very least, it would also need a
>
> BUG_ON(is_cow_mapping(vma->vm_flags));
>
> (or at least make it return VM_FAULT_SIGBUS). Because a COW mapping _will_
> confuse the VM and cause it to do random bad things in vm_normal_page().
That leaves my use-case out for now. I will need COW for my mapping when
switching to this interface. Looks like a lot of things need rethinking
in memory.c for COW with no struct page behind.
--
Carsten Otte
IBM Linux technology center
ARCH=s390
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