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authorJohn Hubbard <jhubbard@nvidia.com>2020-05-16 18:23:36 -0700
committerDavid S. Miller <davem@davemloft.net>2020-05-17 12:37:45 -0700
commitdbfe7d74376e187f3c6eaff822e85176bc2cd06e (patch)
tree81d990e7cc2bf3e04dc61b5c8e96c208a7a65225 /mm/Kconfig
parent9740a7ae6d5208897bf3ef49e8595dc4cfd323ee (diff)
rds: convert get_user_pages() --> pin_user_pages()
This code was using get_user_pages_fast(), in a "Case 2" scenario (DMA/RDMA), using the categorization from [1]. That means that it's time to convert the get_user_pages_fast() + put_page() calls to pin_user_pages_fast() + unpin_user_pages() calls. There is some helpful background in [2]: basically, this is a small part of fixing a long-standing disconnect between pinning pages, and file systems' use of those pages. [1] Documentation/core-api/pin_user_pages.rst [2] "Explicit pinning of user-space pages": https://lwn.net/Articles/807108/ Cc: David S. Miller <davem@davemloft.net> Cc: Jakub Kicinski <kuba@kernel.org> Cc: netdev@vger.kernel.org Cc: linux-rdma@vger.kernel.org Cc: rds-devel@oss.oracle.com Signed-off-by: John Hubbard <jhubbard@nvidia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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