[PATCH] Fix x86_64 SPINLOCK_MAGIC debugging

[Zwane Mwaikambo]

Using a label isn't sufficent anymore for determining the location of the
failed lock. Use __builtin_return_address instead.

Signed-off-by: Zwane Mwaikambo <zwane@xxxxxxxxxxx>

--- linux-2.6-bk/include/asm-x86_64/spinlock.h.orig	2004-09-09 22:58:46.389411752 -0400
+++ linux-2.6-bk/include/asm-x86_64/spinlock.h	2004-09-09 23:00:31.513430472 -0400
@@ -113,10 +113,8 @@ static inline int _raw_spin_trylock(spin
 static inline void _raw_spin_lock(spinlock_t *lock)
 {
 #ifdef CONFIG_DEBUG_SPINLOCK
-	__label__ here;
-here:
 	if (lock->magic != SPINLOCK_MAGIC) {
-printk("eip: %p\n", &&here);
+		printk("eip: %p\n", __builtin_return_address(0));
 		BUG();
 	}
 #endif
-
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