From: Pavel Machek <pavel@ucw.cz>
Date: Thu, 4 Jun 2020 23:42:59 +0200
Subject: net/xdp: use shift instead of 64 bit division
Patch-mainline: v5.8-rc1
Git-commit: 7d877c35ca84cfa634fd63c2b64bf7b6ae9c71cb
References: bsc#1176447

64bit division is kind of expensive, and shift should do the job here.

Signed-off-by: Pavel Machek (CIP) <pavel@denx.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/xdp/xdp_umem.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/xdp/xdp_umem.c
+++ b/net/xdp/xdp_umem.c
@@ -343,7 +343,7 @@ static int xdp_umem_reg(struct xdp_umem
 	if ((addr + size) < addr)
 		return -EINVAL;
 
-	npgs = div_u64(size, PAGE_SIZE);
+	npgs = size >> PAGE_SHIFT;
 	if (npgs > U32_MAX)
 		return -EINVAL;