Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
diff --git a/include/asm-x86_64/mmu.h b/include/asm-x86_64/mmu.h
new file mode 100644
index 0000000..5dc6ed7
--- /dev/null
+++ b/include/asm-x86_64/mmu.h
@@ -0,0 +1,20 @@
+#ifndef __x86_64_MMU_H
+#define __x86_64_MMU_H
+
+#include <linux/spinlock.h>
+#include <asm/semaphore.h>
+
+/*
+ * The x86_64 doesn't have a mmu context, but
+ * we put the segment information here.
+ *
+ * cpu_vm_mask is used to optimize ldt flushing.
+ */
+typedef struct { 
+	void *ldt;
+	rwlock_t ldtlock; 
+	int size;
+	struct semaphore sem; 
+} mm_context_t;
+
+#endif