[PATCH 2/9] mm: Provide new get_vaddr_frames() helper
jack at suse.cz
Tue Jun 2 08:23:00 PDT 2015
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
So the attached patch should do what you had in mind. OK?
Jan Kara <jack at suse.cz>
SUSE Labs, CR
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