From aed9b33d57be990ac7982c82be050a055d7e72ef Mon Sep 17 00:00:00 2001
From: Vinit Agnihotri <vinit.abhay.agnihotri@intel.com>
Date: Wed, 28 Jan 2015 23:09:41 -0800
Subject: [PATCH] Provides backporting of qib driver for RHEL 6.5

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Vinit Agnihotri <vinit.abhay.agnihotri@intel.com>
---
 config/rdma.m4         | 15 +++++++++++++++
 include/linux/percpu.h | 21 +++++++++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 include/linux/percpu.h

diff --git a/config/rdma.m4 b/config/rdma.m4
index 2c68652..d03b5d3 100644
--- a/config/rdma.m4
+++ b/config/rdma.m4
@@ -441,6 +441,21 @@ AC_DEFUN([LINUX_CONFIG_COMPAT],
 		AC_MSG_RESULT(no)
 	])
 
+	AC_MSG_CHECKING([if kernel has percpu variables])
+	LB_LINUX_TRY_COMPILE([
+		#include <linux/percpu.h>
+	],[
+		static DEFINE_PER_CPU(unsigned int, x);
+		this_cpu_inc(x);
+
+		return 0;
+	],[
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_PERCPU_VARS, 1,
+			  [percpu variables are defined])
+	],[
+		AC_MSG_RESULT(no)
+	])
 
 	AC_MSG_CHECKING([if struct iscsi_transport has attr_is_visible])
 	LB_LINUX_TRY_COMPILE([
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
new file mode 100644
index 0000000..b65e5d4
--- /dev/null
+++ b/include/linux/percpu.h
@@ -0,0 +1,21 @@
+#ifndef _COMPAT_LINUX_PERCPU_H
+#define _COMPAT_LINUX_PERCPU_H 1
+
+#include <linux/version.h>
+
+#include_next <linux/percpu.h>
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33))
+
+#ifndef this_cpu_inc
+#define this_cpu_inc(pcp)                       \
+do {                                            \
+        unsigned long flags;                    \
+        raw_local_irq_save(flags);              \
+        *this_cpu_ptr(&(pcp)) += 1;         \
+        raw_local_irq_restore(flags);           \
+} while (0)
+#endif /* this_cpu_inc */
+#endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)) */
+
+#endif	/* _COMPAT_LINUX_PERCPU_H */
-- 
2.46.0