From d8b9d7719cf6fb3186ecc817b3c04005eb1a1f01 Mon Sep 17 00:00:00 2001
From: Matthew Fortune <Matthew.Fortune@imgtec.com>
Date: Tue, 23 Feb 2016 16:09:15 +0000
Subject: [PATCH] migration/postcopy-ram: Guard use of sys/eventfd.h with
 CONFIG_EVENTFD

sys/eventfd.h was being guarded only by a check for linux but does
not exist on older distributions like CentOS 5. Move the include
into the code that uses it and add an appropriate guard.

Signed-off-by: Matthew Fortune <matthew.fortune@imgtec.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-Id: <6D39441BF12EF246A7ABCE6654B023536BB85DEB@hhmail02.hh.imgtec.org>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
---
 migration/postcopy-ram.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c
index 254c629d48..fbd0064fce 100644
--- a/migration/postcopy-ram.c
+++ b/migration/postcopy-ram.c
@@ -52,14 +52,14 @@ struct PostcopyDiscardState {
 #if defined(__linux__)
 
 #include <poll.h>
-#include <sys/eventfd.h>
 #include <sys/mman.h>
 #include <sys/ioctl.h>
 #include <sys/syscall.h>
 #include <asm/types.h> /* for __u64 */
 #endif
 
-#if defined(__linux__) && defined(__NR_userfaultfd)
+#if defined(__linux__) && defined(__NR_userfaultfd) && defined(CONFIG_EVENTFD)
+#include <sys/eventfd.h>
 #include <linux/userfaultfd.h>
 
 static bool ufd_version_check(int ufd)