From 206d503b92d08bd0e8aa5d476bb5abba9ceab7f2 Mon Sep 17 00:00:00 2001
From: Colin Percival <cperciva@FreeBSD.org>
Date: Mon, 16 Jan 2012 02:38:45 +0000
Subject: [PATCH] Make XENHVM work on i386.  The __ffs() function counts bits
 starting from zero, unlike ffs(3), which starts counting from 1.

---
 sys/dev/xen/xenpci/evtchn.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/dev/xen/xenpci/evtchn.c b/sys/dev/xen/xenpci/evtchn.c
index 96c83f0a62b..2d9dd6d664d 100644
--- a/sys/dev/xen/xenpci/evtchn.c
+++ b/sys/dev/xen/xenpci/evtchn.c
@@ -52,7 +52,7 @@ __FBSDID("$FreeBSD$");
 #include <dev/xen/xenpci/xenpcivar.h>
 
 #if defined(__i386__)
-#define	__ffs(word)	ffs(word)
+#define	__ffs(word)	(ffs(word) - 1)
 #elif defined(__amd64__)
 static inline unsigned long __ffs(unsigned long word)
 {