On Wed, Sep 02, 2020 at 10:13:12AM +0200, Niklas Schnelle wrote:

On 9/2/20 12:16 AM, Nicolin Chen wrote:

quoted

These two patches are to update default segment_boundary_mask.

PATCH-1 fixes overflow issues in callers of dma_get_seg_boundary.
Previous version was a series: https://lkml.org/lkml/2020/8/31/1026

Then PATCH-2 sets default segment_boundary_mask to ULONG_MAX.

Nicolin Chen (2):
  dma-mapping: introduce dma_get_seg_boundary_nr_pages()
  dma-mapping: set default segment_boundary_mask to ULONG_MAX

I gave both of your patches a quick test ride on a couple of dev mainframes,
both NVMe, ConnectX and virtio-pci devices all seems to work fine.
I already commented on Christoph's mail that I like the helper approach,
so as for s390 you can add my

Acked-by: Niklas Schnelle <schnelle@linux.ibm.com>

 
Thanks for testing and the ack!