diff mbox series

net/xdp: use shift instead of 64 bit division

Message ID 20200604214259.GA10835@amd
State New
Headers show
Series net/xdp: use shift instead of 64 bit division | expand

Commit Message

Pavel Machek June 4, 2020, 9:42 p.m. UTC 
64bit division is kind of expensive, and shift should do the job here.

Signed-off-by: Pavel Machek (CIP) <pavel@denx.de>

---

Now with patch. Sorry about that.
diff mbox series

Patch

diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c
index 3889bd9aec46..d6c91a43a1ee 100644
--- a/net/xdp/xdp_umem.c
+++ b/net/xdp/xdp_umem.c
@@ -372,7 +372,7 @@  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;