[PATCH] unmodified driver build fixes

["Jan Beulich" <jbeulich@novell.com>]

Make the drivers build properly in a 2.6.27 environment as well as
against a kernel with pv-ops Xen configured on (in the latter case more
work would be needed to also make the drivers work, as there's a large
number of duplicate exports).

Portions from Charles Arnold <carnold@novell.com>.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

Index: 2008-11-20/unmodified_drivers/linux-2.6/balloon/Kbuild
===================================================================
--- 2008-11-20.orig/unmodified_drivers/linux-2.6/balloon/Kbuild	2007-04-05 17:35:34.000000000 +0200
+++ 2008-11-20/unmodified_drivers/linux-2.6/balloon/Kbuild	2008-11-21 10:14:15.000000000 +0100
@@ -4,6 +4,5 @@ obj-m  = xen-balloon.o
 
 EXTRA_CFLAGS += -I$(M)/platform-pci
 
-xen-balloon-objs =
-xen-balloon-objs += balloon.o
-xen-balloon-objs += sysfs.o
+xen-balloon-y := balloon.o sysfs.o
+xen-balloon-$(CONFIG_XEN_SCRUB_PAGES) += scrub.o
Index: 2008-11-20/unmodified_drivers/linux-2.6/mkbuildtree
===================================================================
--- 2008-11-20.orig/unmodified_drivers/linux-2.6/mkbuildtree	2008-02-22 10:04:45.000000000 +0100
+++ 2008-11-20/unmodified_drivers/linux-2.6/mkbuildtree	2008-11-21 10:16:40.000000000 +0100
@@ -53,6 +53,7 @@ i[34567]86|x86_64)
         ln -sf ${XL}/include/asm-x86/mach-xen/asm/synch_bitops*.h include/asm
         ln -sf ${XL}/include/asm-x86/mach-xen/asm/maddr*.h include/asm
         ln -sf ${XL}/include/asm-x86/mach-xen/asm/gnttab_dma.h include/asm
+        ln -sf ${XL}/arch/x86/lib/scrub.c balloon
     else
         if [ $uname = x86_64 ]; then
             mkdir -p include/asm-i386
Index: 2008-11-20/unmodified_drivers/linux-2.6/platform-pci/platform-compat.c
===================================================================
--- 2008-11-20.orig/unmodified_drivers/linux-2.6/platform-pci/platform-compat.c	2007-04-16 09:26:34.000000000 +0200
+++ 2008-11-20/unmodified_drivers/linux-2.6/platform-pci/platform-compat.c	2008-11-21 09:52:00.000000000 +0100
@@ -14,7 +14,11 @@ EXPORT_SYMBOL(system_state);
 
 void ctrl_alt_del(void)
 {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27)
 	kill_proc(1, SIGINT, 1); /* interrupt init */
+#else
+	kill_cad_pid(SIGINT, 1);
+#endif
 }
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,8)
Index: 2008-11-20/unmodified_drivers/linux-2.6/platform-pci/machine_reboot.c
===================================================================
--- 2008-11-20.orig/unmodified_drivers/linux-2.6/platform-pci/machine_reboot.c	2008-10-24 11:21:38.000000000 +0200
+++ 2008-11-20/unmodified_drivers/linux-2.6/platform-pci/machine_reboot.c	2008-11-21 09:41:52.000000000 +0100
@@ -34,7 +34,11 @@ static void ap_suspend(void *_info)
 	atomic_dec(&info->nr_spinning);
 }
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,27)
 #define initiate_ap_suspend(i)	smp_call_function(ap_suspend, i, 0, 0)
+#else
+#define initiate_ap_suspend(i)	smp_call_function(ap_suspend, i, 0)
+#endif
 
 #else /* !defined(CONFIG_SMP) */