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

Jason Gunthorpe
2019-05-06T19:50:24Z

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?

Jason