Re: [patch 2/2] mspec driver

Jes Sorensen
2006-03-17T14:11:48Z

Nick Piggin wrote:
> Jes Sorensen wrote:
>> We don't want COW here as the access is backed by special behavior in
>> the memory controller. We only allow shared mappings for that reason.
>>
> No problem, I think you should just stop using the VM_PFNMAP flag then.
> [Linus should jump in here if I'm wrong ;)]

I'd have to go back and find the discussion to verify, but if I
remember correctly the conclusion was that I needed to use it in
order to make sure that vm_normal_page() didn't start thinking it was
in fact a real page, ie. VM_PFNMAP + never a COW mapping..

Chers,
Jes