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From: John Hubbard <jhubbard@nvidia.com>
To: Andrew Morton <akpm@linux-foundation.org>
Subject: [PATCH v10 16/25] net/xdp: set FOLL_PIN via pin_user_pages()
Date: Thu, 12 Dec 2019 00:19:08 -0800
Message-ID: <20191212081917.1264184-17-jhubbard@nvidia.com>
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 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

Convert net/xdp to use the new pin_longterm_pages() call, which sets
FOLL_PIN. Setting FOLL_PIN is now required for code that requires
tracking of pinned pages.

In partial anticipation of this work, the net/xdp code was already
calling put_user_page() instead of put_page(). Therefore, in order to
convert from the get_user_pages()/put_page() model, to the
pin_user_pages()/put_user_page() model, the only change required
here is to change get_user_pages() to pin_user_pages().

Acked-by: Bj=C3=B6rn T=C3=B6pel <bjorn.topel@intel.com>
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
---
 net/xdp/xdp_umem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c
index 3049af269fbf..d071003b5e76 100644
--- a/net/xdp/xdp_umem.c
+++ b/net/xdp/xdp_umem.c
@@ -291,7 +291,7 @@ static int xdp_umem_pin_pages(struct xdp_umem *umem)
 		return -ENOMEM;
=20
 	down_read(&current->mm->mmap_sem);
-	npgs =3D get_user_pages(umem->address, umem->npgs,
+	npgs =3D pin_user_pages(umem->address, umem->npgs,
 			      gup_flags | FOLL_LONGTERM, &umem->pgs[0], NULL);
 	up_read(&current->mm->mmap_sem);
=20
--=20
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