SL_WRITEBACK_CACHE_SET_UNSUPPORTED
sl->sl_flags &= ~SL_WRITEBACK_CACHE_SET_UNSUPPORTED;
sl->sl_flags &= ~SL_WRITEBACK_CACHE_SET_UNSUPPORTED;
sl->sl_flags |= SL_WRITEBACK_CACHE_SET_UNSUPPORTED;
SL_WRITEBACK_CACHE_SET_UNSUPPORTED) == 0) {