From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Sat, 26 Sep 2015 15:17:18 +0000 (-0400)
Subject: s390: allocate membarrier system call number
X-Git-Tag: v0.9.0~26
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=33f0d0b1c3c9ee55e49b6f7bed146e483e3fd935;p=userspace-rcu.git

s390: allocate membarrier system call number

Now that the membarrier system call is allocated on s390/s390x, allocate
its number in our architecture header if the system headers don't
allocate it. This allows using the membarrier system call as soon as
implemented in the kernel, even if the distribution has old kernel
headers.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/urcu/arch/s390.h b/urcu/arch/s390.h
index b1474d8..6dc09a3 100644
--- a/urcu/arch/s390.h
+++ b/urcu/arch/s390.h
@@ -51,6 +51,14 @@ static inline cycles_t caa_get_cycles (void)
 	return cycles;
 }
 
+/*
+ * Define the membarrier system call number if not yet available in the
+ * system headers.
+ */
+#ifndef __NR_membarrier
+#define __NR_membarrier		356
+#endif
+
 #ifdef __cplusplus 
 }
 #endif