From 10087fe1fa3e4aa4b6722a1d27a47853ebdf47c8 Mon Sep 17 00:00:00 2001
From: Richard Yao <ryao@cs.stonybrook.edu>
Date: Sun, 3 Mar 2013 23:42:32 -0500
Subject: [PATCH] Linux 3.9 compat: Include linux/sched/rt.h

Linux 3.9 reorganized sched.h, splitting it into numerous files.
torvalds/linux@8bd75c77b7c6a3954140dd2e20346aef3efe4a35 moved MAX_PRIO
and MAX_RT_PRIO to linux/sched/rt.h.

Signed-off-by: Richard Yao <ryao@cs.stonybrook.edu>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
---
 config/spl-build.m4     | 20 ++++++++++++++++++++
 include/sys/sysmacros.h |  5 +++++
 2 files changed, 25 insertions(+)

diff --git a/config/spl-build.m4 b/config/spl-build.m4
index 3dcc05e65d..eef3a76aea 100644
--- a/config/spl-build.m4
+++ b/config/spl-build.m4
@@ -88,6 +88,7 @@ AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
 	SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
 	SPL_AC_SHRINK_CONTROL_STRUCT
 	SPL_AC_RWSEM_SPINLOCK_IS_RAW
+	SPL_AC_SCHED_RT_HEADER
 ])
 
 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
@@ -2217,3 +2218,22 @@ AC_DEFUN([SPL_AC_RWSEM_SPINLOCK_IS_RAW], [
 	])
 	EXTRA_KCFLAGS="$tmp_flags"
 ])
+
+dnl #
+dnl # 3.9 API change,
+dnl # Moved things from linux/sched.h to linux/sched/rt.h
+dnl #
+AC_DEFUN([SPL_AC_SCHED_RT_HEADER],
+	[AC_MSG_CHECKING([whether header linux/sched/rt.h exists])
+	SPL_LINUX_TRY_COMPILE([
+		#include <linux/sched.h>
+		#include <linux/sched/rt.h>
+	],[
+		return 0;
+	],[
+		AC_DEFINE(HAVE_SCHED_RT_HEADER, 1, [linux/sched/rt.h exists])
+		AC_MSG_RESULT(yes)
+	],[
+		AC_MSG_RESULT(no)
+	])
+])
diff --git a/include/sys/sysmacros.h b/include/sys/sysmacros.h
index 7c4da67fc9..b4778b70e8 100644
--- a/include/sys/sysmacros.h
+++ b/include/sys/sysmacros.h
@@ -26,12 +26,17 @@
 #define _SPL_SYSMACROS_H
 
 #include <linux/module.h>
+#include <linux/sched.h>
 #include <linux/cpumask.h>
 #include <sys/debug.h>
 #include <sys/varargs.h>
 #include <sys/zone.h>
 #include <sys/signal.h>
 
+#ifdef HAVE_SCHED_RT_HEADER
+#include <linux/sched/rt.h>
+#endif
+
 #ifndef _KERNEL
 #define _KERNEL				__KERNEL__
 #endif