From 2ee6484c6de8f99a1837f4d897af9f7531022a67 Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bvanassche@acm.org>
Date: Tue, 21 Jan 2014 14:35:22 +0000
Subject: [PATCH] scst: RHEL 5 build fix

Kernel versions before 2.6.26 do not have a definition for the
ACCESS_ONCE() macro, hence provide one.

Signed-off-by: Sebastian Herbszt <herbszt@gmx.de>


git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@5220 d57e44dd-8a1f-0410-8b47-8ef2f437770f
---
 scst/include/scst.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/scst/include/scst.h b/scst/include/scst.h
index 23444523c..8c7f89206 100644
--- a/scst/include/scst.h
+++ b/scst/include/scst.h
@@ -86,6 +86,14 @@ typedef _Bool bool;
 #endif
 #endif
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)
+/*
+ * See also patch "Move ACCESS_ONCE() to <linux/compiler.h>" (commit ID
+ * 9c3cdc1f83a6e07092392ff4aba6466517dbd1d0).
+ */
+#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
+#endif
+
 #ifdef INSIDE_KERNEL_TREE
 #include <scst/scst_sgv.h>
 #else