src/share/classes/java/nio/Bits.java

*** 613,623 ****
              return unaligned;
          String arch = AccessController.doPrivileged(
              new sun.security.action.GetPropertyAction("os.arch"));
          unaligned = arch.equals("i386") || arch.equals("x86")
              || arch.equals("amd64") || arch.equals("x86_64")
!             || arch.equals("ppc64") || arch.equals("ppc64le");
          unalignedKnown = true;
          return unaligned;
      }
  
  
--- 613,624 ----
              return unaligned;
          String arch = AccessController.doPrivileged(
              new sun.security.action.GetPropertyAction("os.arch"));
          unaligned = arch.equals("i386") || arch.equals("x86")
              || arch.equals("amd64") || arch.equals("x86_64")
!             || arch.equals("ppc64") || arch.equals("ppc64le")
!             || arch.equals("aarch64");
          unalignedKnown = true;
          return unaligned;
      }