src/hotspot/cpu/x86/interp_masm_x86.cpp

@@ -1189,11 +1189,11 @@
     movptr(Address(lock_reg, mark_offset), swap_reg);
 
     assert(lock_offset == 0,
            "displaced header must be first word in BasicObjectLock");
 
-    if (os::is_MP()) lock();
+    lock();
     cmpxchgptr(lock_reg, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
     if (PrintBiasedLockingStatistics) {
       cond_inc32(Assembler::zero,
                  ExternalAddress((address) BiasedLocking::fast_path_entry_count_addr()));
     }

@@ -1286,11 +1286,11 @@
 
     // zero for recursive case
     jcc(Assembler::zero, done);
 
     // Atomic swap back the old header
-    if (os::is_MP()) lock();
+    lock();
     cmpxchgptr(header_reg, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
 
     // zero for simple unlock of a stack-lock case
     jcc(Assembler::zero, done);