From: Pavel Machek <pavel@ucw.cz>
Date: Thu, 4 Jun 2020 21:42:59 +0000 (+0200)
Subject: net/xdp: use shift instead of 64 bit division
X-Git-Tag: v5.15~3655^2~12
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7d877c35ca84cfa634fd63c2b64bf7b6ae9c71cb;p=platform%2Fkernel%2Flinux-starfive.git

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) <pavel@denx.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c
index 1bbaf17..a0d2b75 100644
--- 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;