From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Thu, 18 Nov 2010 22:04:46 +0000 (+0000)
Subject: filter: use reciprocal divide
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c26aed40f4fd18f86bcc6aba557cab700b129b73;p=linux-beck.git

filter: use reciprocal divide

At compile time, we can replace the DIV_K instruction (divide by a
constant value) by a reciprocal divide.

At exec time, the expensive divide is replaced by a multiply, a less
expensive operation on most processors.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Changli Gao <xiaosuo@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/filter.c b/net/core/filter.c
index c0b68f7c8036..23e0a2a9a4de 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -37,6 +37,7 @@
 #include <asm/uaccess.h>
 #include <asm/unaligned.h>
 #include <linux/filter.h>
+#include <linux/reciprocal_div.h>
 
 enum {
 	BPF_S_RET_K = 1,
@@ -205,7 +206,7 @@ unsigned int sk_run_filter(struct sk_buff *skb, const struct sock_filter *fentry
 			A /= X;
 			continue;
 		case BPF_S_ALU_DIV_K:
-			A /= K;
+			A = reciprocal_divide(A, K);
 			continue;
 		case BPF_S_ALU_AND_X:
 			A &= X;
@@ -506,6 +507,7 @@ int sk_chk_filter(struct sock_filter *filter, int flen)
 			/* check for division by zero */
 			if (ftest->k == 0)
 				return -EINVAL;
+			ftest->k = reciprocal_value(ftest->k);
 			break;
 		case BPF_S_LD_MEM:
 		case BPF_S_LDX_MEM: