[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: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/x86_64/kernel/head64.c b/arch/x86_64/kernel/head64.c
index e6a71c9556d9..36647ce6aecb 100644
--- a/arch/x86_64/kernel/head64.c
+++ b/arch/x86_64/kernel/head64.c
@@ -85,6 +85,11 @@ void __init x86_64_start_kernel(char * real_mode_data)
         clear_bss();
 
         /*
+         * This must be called really, really early:
+         */
+        lockdep_init();
+
+        /*
          * switch to init_level4_pgt from boot_level4_pgt
          */
         memcpy(init_level4_pgt, boot_level4_pgt, PTRS_PER_PGD*sizeof(pgd_t));