[PATCH mlx5-next 08/10] net/rds: Detect need of On-Demand-Paging memory registration
From: Leon Romanovsky <leon@kernel.org>
Date: 2020-01-15 12:44:09
Also in:
linux-rdma
Subsystem:
networking [general], rds - reliable datagram sockets, the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Allison Henderson, Linus Torvalds
From: Hans Westgaard Ry <redacted> Add code to check if memory intended for RDMA is FS-DAX-memory. RDS will fail with error code EOPNOTSUPP if FS-DAX-memory is detected. Signed-off-by: Hans Westgaard Ry <redacted> Signed-off-by: Leon Romanovsky <redacted> --- net/rds/rdma.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/net/rds/rdma.c b/net/rds/rdma.c
index 916f5ec373d8..eb23c38ce2b3 100644
--- a/net/rds/rdma.c
+++ b/net/rds/rdma.c@@ -156,11 +156,13 @@ void rds_rdma_drop_keys(struct rds_sock *rs) static int rds_pin_pages(unsigned long user_addr, unsigned int nr_pages, struct page **pages, int write) { + unsigned int gup_flags = FOLL_LONGTERM; int ret; - ret = get_user_pages_fast(user_addr, nr_pages, write ? FOLL_WRITE : 0, - pages); + if (write) + gup_flags |= FOLL_WRITE; + ret = get_user_pages_fast(user_addr, nr_pages, gup_flags, pages); if (ret >= 0 && ret < nr_pages) { while (ret--) put_page(pages[ret]); --
2.20.1