File barrier.h-add-generic-smp_mb-implementation.patch of Package liburing

From ba97eaf8f9ef2030d581be10df9d875dbfadc91d Mon Sep 17 00:00:00 2001
From: Jeff Moyer <jmoyer@redhat.com>
Date: Tue, 5 Nov 2019 10:33:19 -0500
Subject: barrier.h: add generic smp_mb implementation
References: bsc#1159055
Patch-mainline: Queued

This missing define causes build failures on s390:

  src/include/liburing.h:298: undefined reference to `io_uring_smp_mb'

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Johannes Thumshirn <jthumshirn@suse.de>
---
 src/include/liburing/barrier.h |    1 +
 1 file changed, 1 insertion(+)

--- a/src/include/liburing/barrier.h
+++ b/src/include/liburing/barrier.h
@@ -76,6 +76,7 @@ do {						\
  * Add arch appropriate definitions. Be safe and use full barriers for
  * archs we don't have support for.
  */
+#define io_uring_smp_mb()	__sync_synchronize()
 #define io_uring_smp_rmb()	__sync_synchronize()
 #define io_uring_smp_wmb()	__sync_synchronize()
 #endif /* defined(__x86_64__) || defined(__i386__) */