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Date:   Mon, 6 May 2019 16:50:20 -0300
From:   Jason Gunthorpe <jgg@ziepe.ca>
To:     Andrey Konovalov <andreyknvl@google.com>
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Subject: Re: [PATCH v15 13/17] IB, arm64: untag user pointers in
 ib_uverbs_(re)reg_mr()
Message-ID: <20190506195020.GD6201@ziepe.ca>
References: <cover.1557160186.git.andreyknvl@google.com>
 <66d044ab9445dcf36a96205a109458ac23f38b73.1557160186.git.andreyknvl@google.com>
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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