Re: get_user_pages ?

[Mark Hounschell <markh@compro.net>]

Nick Piggin wrote:
> Mark Hounschell wrote:
>> Nick Piggin wrote:
> 
>>> This area is going through some changes lately. If you want something to
>>> quickly get things working, removing VM_PFNMAP from your vma flags
>>> should
>>> work.
>>>
>>
>>
>> Yes, that actually does work while the task is running but as soon as I
>> exit the task the machine freezes.
> 
> Hmm. Does it freeze, or oops? (ie. were you in X and missed the oops)
> Can you get a sysrq backtrace?
> 
> Oh, hmm you'll need to increment the refcount of each page before
> mapping it. That's probably the problem.
> 
> OK, I'd suggest either using vm_insert_page, or converting it all over
> to a ->nopage handler then.
> 

I set the bit back on after get_user_pages and now I seem to be OK.

You've looked at the code some obviously. What is in my future WRT these
changes being made that you referenced above and the depreciation of
some of the calls in use. Given my situation, do you foresee anything
that will keep me from being able to get valid bus addresses for my pte?

Thanks
Mark