commit 380d41f776ef3719586818edc6d2d64755d3de3c (HEAD -> add_s390x_mt-asm, origin/add_s390x_mt-asm)
Author: Namrata Bhave <Namrata.Bhave@ibm.com>
Date:   Tue Apr 18 14:50:26 2023 +0530

    Add missing s390x support for NDB

diff --git a/storage/ndb/include/portlib/mt-asm.h b/storage/ndb/include/portlib/mt-asm.h
index 418b8d9c711..2ccee71e91a 100644
--- a/storage/ndb/include/portlib/mt-asm.h
+++ b/storage/ndb/include/portlib/mt-asm.h
@@ -144,6 +144,15 @@ xcng(volatile unsigned * addr, int val)
   return prev;
 }
  +#elif defined(__s390x__)
+#define NDB_HAVE_MB
+#define NDB_HAVE_RMB
+#define NDB_HAVE_WMB
+
+#define mb()   { asm volatile("" : : : "memory"); }
+#define rmb()  mb()
+#define wmb()  mb()
+
 #elif defined(__aarch64__)
 #include <atomic>
 #define NDB_HAVE_MB