Re: [patch] do_no_pfn handler

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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
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