Blackfin arch: disable pthread stack check for SMP at runtime

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

arch/blackfin/include/asm/l1layout.h

@@ -8,6 +8,7 @@
 
 #include <asm/blackfin.h>
 
+#ifndef CONFIG_SMP
 #ifndef __ASSEMBLY__
 
 /* Data that is "mapped" into the process VM at the start of the L1 scratch
@@ -28,5 +29,6 @@ struct l1_scratch_task_info
 						get_l1_scratch_start())
 
 #endif
+#endif
 
 #endif