Re: get_user_pages() still broken in 2.6

[Andi Kleen]

Timur Tabi <timur.tabi@xxxxxxxxxxx> writes:

> Christoph Hellwig wrote:
>
>> get_user_pages locks the page in memory.  It doesn't do anything about ptes.
>
> I don't understand the difference.  I thought a locked page is one
> that stays in memory (i.e. isn't swapped out) and whose physical
> address never changes.  Is that wrong?  All I need to do is keep a
> page in memory at the same physical address until I'm done with it.

After get_user_pages you don't need the page tables anymore. 
The struct page *s returned by it can be used for DMA.

-Andi

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