Re: [PATCH v15 13/17] IB, arm64: untag user pointers in ib_uverbs_(re)reg_mr()

Leon Romanovsky
2019-05-07T06:33:45Z

On Mon, May 06, 2019 at 04:50:20PM -0300, Jason Gunthorpe wrote:
> On Mon, May 06, 2019 at 06:30:59PM +0200, Andrey Konovalov wrote:
> > This patch is a part of a series that extends arm64 kernel ABI to allow to
> > pass tagged user pointers (with the top byte set to something else other
> > than 0x00) as syscall arguments.
> >
> > ib_uverbs_(re)reg_mr() use provided user pointers for vma lookups (through
> > e.g. mlx4_get_umem_mr()), which can only by done with untagged pointers.
> >
> > Untag user pointers in these functions.
> >
> > Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
> > ---
> > drivers/infiniband/core/uverbs_cmd.c | 4 ++++
> > 1 file changed, 4 insertions(+)
>
> I think this is OK.. We should really get it tested though.. Leon?

It can be done after v5.2-rc1.

Thanks

>
> Jason