[PATCH] lockdep: x86_64 early init

x86_64 uses spinlocks very early - earlier than start_kernel().  So call
lockdep_init() from the arch setup code.
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NArjan van de Ven <arjan@linux.intel.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

arch/x86_64/kernel/head64.c

@@ -84,6 +84,11 @@ void __init x86_64_start_kernel(char * real_mode_data)
 	asm volatile("lidt %0" :: "m" (idt_descr));
 	clear_bss();
 
+	/*
+	 * This must be called really, really early:
+	 */
+	lockdep_init();
+
 	/*
 	 * switch to init_level4_pgt from boot_level4_pgt
 	 */