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Date:   Mon, 11 Feb 2019 13:47:10 -0700
From:   Jason Gunthorpe <jgg@ziepe.ca>
To:     ira.weiny@intel.com, linux-rdma@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        Daniel Borkmann <daniel@iogearbox.net>, netdev@vger.kernel.org,
        Mike Marciniszyn <mike.marciniszyn@intel.com>,
        Dennis Dalessandro <dennis.dalessandro@intel.com>,
        Doug Ledford <dledford@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Dan Williams <dan.j.williams@intel.com>
Subject: Re: [PATCH 0/3] Add gup fast + longterm and use it in HFI1
Message-ID: <20190211204710.GE24692@ziepe.ca>
References: <20190211201643.7599-1-ira.weiny@intel.com>
 <20190211203417.a2c2kbmjai43flyz@linux-r8p5>
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On Mon, Feb 11, 2019 at 12:34:17PM -0800, Davidlohr Bueso wrote:
> On Mon, 11 Feb 2019, ira.weiny@intel.com wrote:
> > Ira Weiny (3):
> >  mm/gup: Change "write" parameter to flags
> >  mm/gup: Introduce get_user_pages_fast_longterm()
> >  IB/HFI1: Use new get_user_pages_fast_longterm()
> 
> Out of curiosity, are you planning on having all rdma drivers
> use get_user_pages_fast_longterm()? Ie:
> 
> hw/mthca/mthca_memfree.c:       ret = get_user_pages_fast(uaddr & PAGE_MASK, 1, FOLL_WRITE, pages);

This one is certainly a mistake - this should be done with a umem.

Jason