linux-kernel - [PATCH 0/2] mm/gup + IB: allow FOLL_FORCE for gup

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Date:   Sun, 24 Nov 2019 16:37:13 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        Christoph Hellwig <hch@...radead.org>
CC:     Ira Weiny <ira.weiny@...el.com>, <linux-rdma@...r.kernel.org>,
        <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
        John Hubbard <jhubbard@...dia.com>
Subject: [PATCH 0/2] mm/gup + IB: allow FOLL_FORCE for gup_fast and use in IB

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