Copy the ssclib_yt object to your arch/x86_64 directory and apply this
patch.  SscSimulAppMark is declared in spinlock.h (which most files
include somehow).

diff -Naur -X linux-2.6.13/Documentation/dontdiff linux-2.6.13.orig/arch/x86_64/Makefile linux-2.6.13/arch/x86_64/Makefile
--- linux-2.6.13.orig/arch/x86_64/Makefile	2005-08-28 16:41:01.000000000 -0700
+++ linux-2.6.13/arch/x86_64/Makefile	2005-09-08 10:41:23.000000000 -0700
@@ -50,7 +50,7 @@
 # prevent gcc from generating any FP code by mistake
 CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
 
-head-y := arch/x86_64/kernel/head.o arch/x86_64/kernel/head64.o arch/x86_64/kernel/init_task.o
+head-y := arch/x86_64/kernel/head.o arch/x86_64/kernel/head64.o arch/x86_64/kernel/init_task.o arch/x86_64/ssclib_yt.o
 
 libs-y 					+= arch/x86_64/lib/
 core-y					+= arch/x86_64/kernel/ \
diff -Naur -X linux-2.6.13/Documentation/dontdiff linux-2.6.13.orig/include/asm-x86_64/spinlock.h linux-2.6.13/include/asm-x86_64/spinlock.h
--- linux-2.6.13.orig/include/asm-x86_64/spinlock.h	2005-08-28 16:41:01.000000000 -0700
+++ linux-2.6.13/include/asm-x86_64/spinlock.h	2005-09-08 10:33:35.000000000 -0700
@@ -58,6 +58,8 @@
 	"jmp 1b\n" \
 	LOCK_SECTION_END
 
+extern void SscSimulAppMark(uint64_t val);
+
 /*
  * This works. Despite all the confusion.
  * (except on PPro SMP or if we are using OOSTORE)
@@ -80,6 +82,7 @@
 	__asm__ __volatile__(
 		spin_unlock_string
 	);
+	SscSimulAppMark(0);
 }
 
 #else
@@ -124,6 +127,7 @@
 	__asm__ __volatile__(
 		spin_lock_string
 		:"=m" (lock->lock) : : "memory");
+	SscSimulAppMark(1);
 }