[Openmp-commits] [openmp] [OpenMP][libomptarget] Enable automatic unified shared memory executi… (PR #75999)

[Johannes Doerfert via Openmp-commits]

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@@ -144,19 +144,33 @@ void PluginAdaptorTy::initDevices(PluginManager &PM) {
 
   int32_t NumPD = getNumberOfPluginDevices();
   ExclusiveDevicesAccessor->reserve(DeviceOffset + NumPD);
+  // Auto zero-copy is a per-device property. We need to ensure
+  // that all devices are suggesting to use it.
+  bool UseAutoZeroCopy = true;
+  if (NumPD == 0)
+    UseAutoZeroCopy = false;
   for (int32_t PDevI = 0, UserDevId = DeviceOffset; PDevI < NumPD; PDevI++) {
     auto Device = std::make_unique<DeviceTy>(this, UserDevId, PDevI);
+
     if (auto Err = Device->init()) {
       DP("Skip plugin known device %d: %s\n", PDevI,
          toString(std::move(Err)).c_str());
       continue;
     }
+    UseAutoZeroCopy = Device->useAutoZeroCopy() && UseAutoZeroCopy;
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jdoerfert wrote:

The other way around to save calls into the plugin.

https://github.com/llvm/llvm-project/pull/75999