From: John Hubbard <jhubbard@nvidia.com>
To: Andrew Morton <akpm@linux-foundation.org>,
Jason Gunthorpe <jgg@ziepe.ca>, Leon Romanovsky <leon@kernel.org>,
Christoph Hellwig <hch@infradead.org>
Cc: Ira Weiny <ira.weiny@intel.com>, <linux-rdma@vger.kernel.org>,
<linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>,
John Hubbard <jhubbard@nvidia.com>
Subject: [PATCH 0/2] mm/gup + IB: allow FOLL_FORCE for gup_fast and use in IB
Date: Sun, 24 Nov 2019 16:37:13 -0800 [thread overview]
Message-ID: <20191125003715.516290-1-jhubbard@nvidia.com> (raw)
Hi Leon, Jason, Christoph,
Maybe I'm overlooking something, but as I wrote in patch 1, it looks
like we can simply allow FOLL_FORCE to be passed to gup_fast().
This should fix Leon's reported RDMA failure [1] when using patch 2 by
itself. (I've compile- and boot-tested these, and also did short LTP
and fio with direct IO tests, but I don't have an Infiniband runtime
setup that exercises the umem.c code.)
[1] https://lore.kernel.org/r/20191124100724.GH136476@unreal
John Hubbard (2):
mm/gup: allow FOLL_FORCE for get_user_pages_fast()
IB/umem: use get_user_pages_fast() to pin DMA pages
drivers/infiniband/core/umem.c | 17 ++++++-----------
mm/gup.c | 3 ++-
2 files changed, 8 insertions(+), 12 deletions(-)
--
2.24.0
next reply other threads:[~2019-11-25 0:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-25 0:37 John Hubbard [this message]
2019-11-25 0:37 ` [PATCH 1/2] mm/gup: allow FOLL_FORCE for get_user_pages_fast() John Hubbard
2019-11-25 0:37 ` [PATCH 2/2] IB/umem: use get_user_pages_fast() to pin DMA pages John Hubbard
2019-11-25 2:07 ` [PATCH 0/2] mm/gup + IB: allow FOLL_FORCE for gup_fast and use in IB John Hubbard
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