From 5adbc09b71f285d7781906cd2a540c19a4c1cc10 Mon Sep 17 00:00:00 2001
From: Stan Moore <stamoor@sandia.gov>
Date: Tue, 6 Feb 2024 12:33:01 -0700
Subject: [PATCH] Move warning to avoid multiple instances

---
 src/KOKKOS/fft3d_kokkos.cpp | 7 -------
 src/KOKKOS/pppm_kokkos.cpp  | 8 ++++++++
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/src/KOKKOS/fft3d_kokkos.cpp b/src/KOKKOS/fft3d_kokkos.cpp
index e9ab095de9..1f39e17326 100644
--- a/src/KOKKOS/fft3d_kokkos.cpp
+++ b/src/KOKKOS/fft3d_kokkos.cpp
@@ -69,13 +69,6 @@ FFT3dKokkos<DeviceType>::FFT3dKokkos(LAMMPS *lmp, MPI_Comm comm, int nfast, int
     if (stack_size < 2048)
       cudaDeviceSetLimit(cudaLimitStackSize,2048);
   #endif
-
-  #if defined (LMP_KOKKOS_GPU)
-    int me;
-    MPI_Comm_rank(comm,&me);
-    if (me == 0)
-      lmp->warning(FLERR,"Using default KISS FFT with Kokkos GPU backends may give suboptimal performance");
-  #endif
 #endif
 
   plan = fft_3d_create_plan_kokkos(comm,nfast,nmid,nslow,
diff --git a/src/KOKKOS/pppm_kokkos.cpp b/src/KOKKOS/pppm_kokkos.cpp
index b83c7e0313..6a2618642b 100644
--- a/src/KOKKOS/pppm_kokkos.cpp
+++ b/src/KOKKOS/pppm_kokkos.cpp
@@ -20,6 +20,7 @@
 
 #include "atom_kokkos.h"
 #include "atom_masks.h"
+#include "comm.h"
 #include "domain.h"
 #include "error.h"
 #include "fft3d_kokkos.h"
@@ -105,6 +106,13 @@ PPPMKokkos<DeviceType>::PPPMKokkos(LAMMPS *lmp) : PPPM(lmp)
   fft1 = nullptr;
   fft2 = nullptr;
   remap = nullptr;
+
+#if defined (LMP_KOKKOS_GPU)
+  #if defined(FFT_KOKKOS_KISSFFT)
+    if (comm->me == 0)
+      error->warning(FLERR,"Using default KISS FFT with Kokkos GPU backends may give suboptimal performance");
+  #endif
+#endif
 }
 
 /* ----------------------------------------------------------------------