From 7a35f2b49581894cde93c356fd9372ff3246d344 Mon Sep 17 00:00:00 2001
From: Chunwei Chen <david.chen@osnexus.com>
Date: Mon, 19 Jun 2017 11:02:20 -0700
Subject: [PATCH] Fix RWSEM_SPINLOCK_IS_RAW check failed
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Initialize dummy_lock to fix the build error in gcc 7.1.1 with:
  error: ‘dummy_lock’ is used uninitialized in this function

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
Closes #622
---
 config/spl-build.m4 | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/config/spl-build.m4 b/config/spl-build.m4
index 7569988..698d51a 100644
--- a/config/spl-build.m4
+++ b/config/spl-build.m4
@@ -1313,7 +1313,8 @@ AC_DEFUN([SPL_AC_RWSEM_SPINLOCK_IS_RAW], [
 		#include <linux/rwsem.h>
 	],[
 		struct rw_semaphore dummy_semaphore __attribute__ ((unused));
-		raw_spinlock_t dummy_lock __attribute__ ((unused));
+		raw_spinlock_t dummy_lock __attribute__ ((unused)) =
+		    __RAW_SPIN_LOCK_INITIALIZER(dummy_lock);
 		dummy_semaphore.wait_lock = dummy_lock;
 	],[
 		AC_MSG_RESULT(yes)
-- 
2.39.2