Blackfin: initial perf_event support

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/kernel/Makefile b/arch/blackfin/kernel/Makefile
index 18ba6ab..d550b24 100644
--- a/arch/blackfin/kernel/Makefile
+++ b/arch/blackfin/kernel/Makefile
@@ -33,6 +33,7 @@
 obj-$(CONFIG_STACKTRACE)             += stacktrace.o
 obj-$(CONFIG_DEBUG_VERBOSE)          += trace.o
 obj-$(CONFIG_BFIN_PSEUDODBG_INSNS)   += pseudodbg.o
+obj-$(CONFIG_PERF_EVENTS)            += perf_event.o
 
 # the kgdb test puts code into L2 and without linker
 # relaxation, we need to force long calls to/from it