net/xdp: use shift instead of 64 bit division

64bit division is kind of expensive, and shift should do the job here. Signed-off-by: Pavel Machek (CIP) <[email protected]> Signed-off-by: David S. Miller <[email protected]>
vieko · Jun 4, 2020 · 7d877c3 · 7d877c3
1 parent a624a86
commit 7d877c3
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c
@@ -336,7 +336,7 @@ static int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr)
 	if ((addr + size) < addr)
 		return -EINVAL;
 
-	npgs = div_u64(size, PAGE_SIZE);
+	npgs = size >> PAGE_SHIFT;
 	if (npgs > U32_MAX)
 		return -EINVAL;