Re: get_user_pages() still broken in 2.6

[Timur Tabi]

Dave Hansen wrote:

> You probably want mlock(2) to keep the kernel from messing with the ptes
> at all.

mlock() can only be called via sys_mlock(), which is a user-space call. 
 Not only that, but only root can call sys_mlock().  This is not 
compatible with our needs.

>  But, you should probably really be thinking about why you're
> accessing the page tables at all.  I count *ONE* instance in drivers/
> where page tables are accessed directly.

I access PTEs to get the physical addresses of a user-space buffer, so 
that we can DMA to/from it directly.

--
Timur Tabi
Staff Software Engineer
timur.tabi@xxxxxxxxxxx
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