[PATCH net-next] xdp: xdp_umem: fix umem pages mapping for 32bits systems

[Ivan Khoronzhuk]

Use kmap instead of page_address as it's not always in low memory.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronz...@linaro.org>
---
 net/xdp/xdp_umem.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c
index 9c6de4f114f8..d3c1411420fd 100644
--- a/net/xdp/xdp_umem.c
+++ b/net/xdp/xdp_umem.c
@@ -169,6 +169,14 @@ static void xdp_umem_clear_dev(struct xdp_umem *umem)
        }
 }
 
+static void xdp_umem_unmap_pages(struct xdp_umem *umem)
+{
+       unsigned int i;
+
+       for (i = 0; i < umem->npgs; i++)
+               kunmap(umem->pgs[i]);
+}
+
 static void xdp_umem_unpin_pages(struct xdp_umem *umem)
 {
        unsigned int i;
@@ -210,6 +218,7 @@ static void xdp_umem_release(struct xdp_umem *umem)
 
        xsk_reuseq_destroy(umem);
 
+       xdp_umem_unmap_pages(umem);
        xdp_umem_unpin_pages(umem);
 
        kfree(umem->pages);
@@ -372,7 +381,7 @@ static int xdp_umem_reg(struct xdp_umem *umem, struct 
xdp_umem_reg *mr)
        }
 
        for (i = 0; i < umem->npgs; i++)
-               umem->pages[i].addr = page_address(umem->pgs[i]);
+               umem->pages[i].addr = kmap(umem->pgs[i]);
 
        return 0;
 
-- 
2.17.1