From ac042bca49f5b269ac3cb4d30c4a191158dc4f25 Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Tue, 11 Jun 2019 10:52:06 +0200
Subject: Do not pass NULL to MPI as a datatype.

Use MPI_DATATYPE_NULL.
---
 src/maximal_slicing_axi_mg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/maximal_slicing_axi_mg.c b/src/maximal_slicing_axi_mg.c
index 365c3ce..100f3c0 100644
--- a/src/maximal_slicing_axi_mg.c
+++ b/src/maximal_slicing_axi_mg.c
@@ -281,7 +281,7 @@ static void get_extents(size_t **pextents, int *level_size, cGH *gh)
     }
 
     if (nb_procs > 1)
-        MPI_Allgather(MPI_IN_PLACE, 0, NULL, extents, 4 * sizeof(*extents), MPI_BYTE, MPI_COMM_WORLD);
+        MPI_Allgather(MPI_IN_PLACE, 0, MPI_DATATYPE_NULL, extents, 4 * sizeof(*extents), MPI_BYTE, MPI_COMM_WORLD);
 
     level_size[0] = 0;
     level_size[1] = 0;
-- 
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