[PATCH] kvm-userland swapping compat

[Andrea Arcangeli <andrea-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

This is the kvm-userland patch needed to compile kvm.git as an
external module on a kernel w/ MMU_NOTIFIER=n with the kvm swapping
patch applied to kvm.git.

Signed-off-by: Andrea Arcangeli <andrea-atKUWr5tajBWk0Htik3J/w@public.gmane.org>

diff --git a/kernel/external-module-compat.h b/kernel/external-module-compat.h
index 67b9cc4..8a65fc6 100644
--- a/kernel/external-module-compat.h
+++ b/kernel/external-module-compat.h
@@ -17,6 +17,31 @@
 #include <linux/hrtimer.h>
 #include <asm/bitops.h>
 
+#ifndef CONFIG_MMU_NOTIFIER
+struct mmu_notifier;
+
+struct mmu_notifier_ops {
+	void (*release)(struct mmu_notifier *mn,
+			struct mm_struct *mm);
+	void (*age_page)(struct mmu_notifier *mn,
+			 struct mm_struct *mm,
+			 unsigned long address);
+	void (*invalidate_page)(struct mmu_notifier *mn,
+				struct mm_struct *mm,
+				unsigned long address);
+	void (*invalidate_range)(struct mmu_notifier *mn,
+				 struct mm_struct *mm,
+				 unsigned long start, unsigned long end);
+};
+
+struct mmu_notifier {
+	const struct mmu_notifier_ops *ops;
+};
+#define mmu_notifier_register(mn, mm) do {} while(0)
+#define mmu_notifier_unregister(mn, mm) do {} while (0)
+#define mmu_notifier_release(mm) do {} while (0)
+#endif
+
 /*
  * 2.6.16 does not have GFP_NOWAIT
  */

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