From 171cd567ce1d07849fcb7cdf45f6f78dc27b642b Mon Sep 17 00:00:00 2001
From: Jincheng Miao <jincheng.miao@gmail.com>
Date: Wed, 7 May 2014 17:48:02 +0800
Subject: [PATCH] Fix kpatch.ko build on Ubuntu Saucy.

The error likes:
make -C /lib/modules/3.11.0-12-generic/build M=/home/ryan/kpatch/kmod/core kpatch.ko
make[3]: Entering directory `/usr/src/linux-headers-3.11.0-12-generic'
  CC [M]  /home/ryan/kpatch/kmod/core/core.o
/home/ryan/kpatch/kmod/core/core.c:42:32: fatal error: linux/preempt_mask.h: No such file or directory
 #include <linux/preempt_mask.h>

I feel sorry to introduce this problem from my laster commit 6c2d6444.
Some old kernel doesn't have header file preempt_mask.h, and the safe
way is using hardirq.h to find in_nmi().

Signed-off-by: Jincheng Miao <jincheng.miao@gmail.com>
---
 kmod/core/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kmod/core/core.c b/kmod/core/core.c
index d790571..a90b280 100644
--- a/kmod/core/core.c
+++ b/kmod/core/core.c
@@ -39,7 +39,7 @@
 #include <linux/stop_machine.h>
 #include <linux/ftrace.h>
 #include <linux/hashtable.h>
-#include <linux/preempt_mask.h>
+#include <linux/hardirq.h>
 #include <asm/stacktrace.h>
 #include <asm/cacheflush.h>
 #include "kpatch.h"