Re: [RESEND 6/7] IB/qib: Use the new FOLL_LONGTERM flag to get_user_pages_fast()

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To: ira.weiny@xxxxxxxxx
Subject: Re: [RESEND 6/7] IB/qib: Use the new FOLL_LONGTERM flag to get_user_pages_fast()
From: Dan Williams <dan.j.williams@xxxxxxxxx>
Date: Fri, 22 Mar 2019 15:15:10 -0700
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, John Hubbard <jhubbard@xxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxx>, Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>, Paul Mackerras <paulus@xxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, Martin Schwidefsky <schwidefsky@xxxxxxxxxx>, Heiko Carstens <heiko.carstens@xxxxxxxxxx>, Rich Felker <dalias@xxxxxxxx>, Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Ralf Baechle <ralf@xxxxxxxxxxxxxx>, James Hogan <jhogan@xxxxxxxxxx>, linux-mm <linux-mm@xxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, linux-mips@xxxxxxxxxxxxxxx, linuxppc-dev <linuxppc-dev@xxxxxxxxxxxxxxxx>, linux-s390 <linux-s390@xxxxxxxxxxxxxxx>, Linux-sh <linux-sh@xxxxxxxxxxxxxxx>, sparclinux@xxxxxxxxxxxxxxx, linux-rdma@xxxxxxxxxxxxxxx, "netdev@xxxxxxxxxxxxxxx" <netdev@xxxxxxxxxxxxxxx>
In-reply-to: <20190317183438.2057-7-ira.weiny@intel.com>
References: <20190317183438.2057-1-ira.weiny@intel.com> <20190317183438.2057-7-ira.weiny@intel.com>

On Sun, Mar 17, 2019 at 7:36 PM <ira.weiny@xxxxxxxxx> wrote:
>
> From: Ira Weiny <ira.weiny@xxxxxxxxx>
>
> Use the new FOLL_LONGTERM to get_user_pages_fast() to protect against
> FS DAX pages being mapped.
>
> Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>

Looks good modulo potential  __get_user_pages_fast() suggestion.

References:
- [RESEND PATCH 0/7] Add FOLL_LONGTERM to GUP fast and use it
  - From: ira . weiny
- [RESEND 6/7] IB/qib: Use the new FOLL_LONGTERM flag to get_user_pages_fast()
  - From: ira . weiny

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