368   if (post_fork || uffd_ == kFdUnused) {  in CreateUserfaultfd()
376       uffd_ = syscall(__NR_userfaultfd, O_CLOEXEC | UFFD_USER_MODE_ONLY);  in CreateUserfaultfd()
380       if (!kIsTargetAndroid && UNLIKELY(uffd_ == -1 && errno == EINVAL)) {  in CreateUserfaultfd()
381         uffd_ = syscall(__NR_userfaultfd, O_CLOEXEC);  in CreateUserfaultfd()
383       if (UNLIKELY(uffd_ == -1)) {  in CreateUserfaultfd()
384         uffd_ = kFallbackMode;  in CreateUserfaultfd()
388         DCHECK(IsValidFd(uffd_));  in CreateUserfaultfd()
405         CHECK_EQ(ioctl(uffd_, UFFDIO_API, &api), 0)  in CreateUserfaultfd()
409       uffd_ = kFallbackMode;  in CreateUserfaultfd()
412   uffd_initialized_ = !post_fork || uffd_ == kFallbackMode;  in CreateUserfaultfd()
413   return IsValidFd(uffd_);  in CreateUserfaultfd()
469       uffd_(kFdUnused),  in MarkCompact()
854   if (uffd_ != kFallbackMode && !use_uffd_sigbus_) {  in RunPhases()
866   if (IsValidFd(uffd_)) {  in RunPhases()
1133       CHECK_EQ(ioctl(uffd_, UFFDIO_REGISTER, &uffd_register), 0)  in PrepareForCompaction()
1149   if (uffd_ != kFallbackMode) {  in PrepareForCompaction()
2029     int ret = ioctl(uffd_, UFFDIO_CONTINUE, &uffd_continue);  in MapProcessedPages()
2065       ret = ioctl(uffd_, UFFDIO_WAKE, &uffd_continue.range);  in MapProcessedPages()
2115     int ret = ioctl(uffd_, UFFDIO_ZEROPAGE, &uffd_zeropage);  in ZeropageIoctl()
2164     int ret = ioctl(uffd_, UFFDIO_COPY, &uffd_copy);  in CopyIoctl()
3205     UpdateClassTableClasses(runtime, uffd_ == kFallbackMode || !has_zygote_space);  in CompactionPause()
3233     if (uffd_ == kFallbackMode || (!has_zygote_space && runtime->IsZygote())) {  in CompactionPause()
3236       if (kIsDebugBuild && IsValidFd(uffd_)) {  in CompactionPause()
3279   if (uffd_ == kFallbackMode) {  in CompactionPause()
3394   if (IsValidFd(uffd_)) {  in KernelPreparation()
3456     ssize_t nread = read(uffd_, &msg, sizeof(msg));  in ConcurrentCompaction()
3478         CHECK_EQ(ioctl(uffd_, UFFDIO_WAKE, &uffd_range), 0)  in ConcurrentCompaction()
4127   DCHECK(IsValidFd(uffd_));  in RegisterUffd()
4135   CHECK_EQ(ioctl(uffd_, UFFDIO_REGISTER, &uffd_register), 0)  in RegisterUffd()
4144   DCHECK(IsValidFd(uffd_));  in UnregisterUffd()
4148   CHECK_EQ(ioctl(uffd_, UFFDIO_UNREGISTER, &range), 0)  in UnregisterUffd()
4157     CHECK_EQ(ioctl(uffd_, UFFDIO_WAKE, &range), 0)  in UnregisterUffd()
4845   if (UNLIKELY(is_zygote && IsValidFd(uffd_))) {  in FinishPhase()
4848     close(uffd_);  in FinishPhase()
4849     uffd_ = kFdUnused;  in FinishPhase()