Re: [PATCH v2] iommu/dma: Map scatterlists more parsimoniously

[Yong Wu <yong.wu-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>]

On Fri, 2015-11-20 at 10:57 +0000, Robin Murphy wrote:
> Whilst blindly assuming the worst case for segment boundaries and
> aligning every segment individually is safe from the point of view
> of respecting the device's parameters, it is also undeniably a waste
> of IOVA space. Futhermore, the knock-on effects of more pages than
> necessary being exposed to device access, additional overhead in page
> table updates and TLB invalidations, etc., are even more undesirable.
> 
> Improve matters by taking the actual boundary mask into account to
> actively detect the cases in which we really do need to adjust a
> segment, and avoid wasting space in the remainder.
> 
> Tested-by: Yong Wu <yong.wu-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
> Signed-off-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
> ---

Hi Robin, Joerg,

   Is there any plan for this patch? It seems to be lost.
Could we pick this up as a fix for v4.5? 
Thanks.