From e2c6bb8bd4444e1bf0e3daef00d0b61b2199723f Mon Sep 17 00:00:00 2001
From: Edgar Gabriel <edgargabriel@users.noreply.github.com>
Date: Thu, 23 Oct 2025 08:43:41 -0500
Subject: [PATCH] fix Win_flush prototype in function table (#289)

the bug was exposed when trying to compile a backend with HDP flush
support.
---
 src/mpi_instance.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/mpi_instance.hpp b/src/mpi_instance.hpp
index c18ff1af4b..b7a2c88d88 100644
--- a/src/mpi_instance.hpp
+++ b/src/mpi_instance.hpp
@@ -71,7 +71,7 @@ struct mpilib_funcs_t {
   int (*Ibarrier)(MPI_Comm comm, MPI_Request *request);
   int (*Win_create)(void *base, MPI_Aint size, int disp_unit, MPI_Info info, MPI_Comm comm, MPI_Win *win);
   int (*Win_free)(MPI_Win *win);
-  int (*Win_flush)(MPI_Win win);
+  int (*Win_flush)(int rank, MPI_Win win);
   int (*Win_flush_all)(MPI_Win win);
   int (*Win_flush_local)(int rank, MPI_Win win);
   int (*Win_lock)(int lock_type, int rank, int mpi_assert, MPI_Win win);