[PATCH 2/9] mm: Provide new get_vaddr_frames() helper

[Jan Kara]

On Thu 28-05-15 16:24:02, Andrew Morton wrote:
> On Wed, 13 May 2015 15:08:08 +0200 Jan Kara <jack at suse.cz> wrote:
> 
> > Provide new function get_vaddr_frames().  This function maps virtual
> > addresses from given start and fills given array with page frame numbers of
> > the corresponding pages. If given start belongs to a normal vma, the function
> > grabs reference to each of the pages to pin them in memory. If start
> > belongs to VM_IO | VM_PFNMAP vma, we don't touch page structures. Caller
> > must make sure pfns aren't reused for anything else while he is using
> > them.
> > 
> > This function is created for various drivers to simplify handling of
> > their buffers.
> > 
> > Acked-by: Mel Gorman <mgorman at suse.de>
> > Acked-by: Vlastimil Babka <vbabka at suse.cz>
> > Signed-off-by: Jan Kara <jack at suse.cz>
> > ---
> >  include/linux/mm.h |  44 +++++++++++
> >  mm/gup.c           | 226 +++++++++++++++++++++++++++++++++++++++++++++++++++++
> 
> That's a lump of new code which many kernels won't be needing.  Can we
> put all this in a new .c file and select it within drivers/media
> Kconfig?
  Yeah, makes sense. I'll write a patch. Hans, is it OK with you if I
just create a patch on top of the series you have in your tree?

								Honza
-- 
Jan Kara <jack at suse.cz>
SUSE Labs, CR