Re: [PATCH 1/2] dma-mapping: add a dma_ops_bypass flag to struct device

[Greg Kroah-Hartman]

On Fri, Mar 20, 2020 at 03:16:39PM +0100, Christoph Hellwig wrote:
> Several IOMMU drivers have a bypass mode where they can use a direct
> mapping if the devices DMA mask is large enough.  Add generic support
> to the core dma-mapping code to do that to switch those drivers to
> a common solution.
> 
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
>  include/linux/device.h      |  6 ++++++
>  include/linux/dma-mapping.h | 30 ++++++++++++++++++------------
>  kernel/dma/mapping.c        | 36 +++++++++++++++++++++++++++---------
>  3 files changed, 51 insertions(+), 21 deletions(-)

Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>