From: Michael Jeanson <mjeanson@efficios.com>
Date: Tue, 1 Mar 2022 20:41:53 +0000 (-0500)
Subject: alpha: allocate membarrier system call number
X-Git-Tag: v0.14.0~35
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=192ea849f267a236eef52e649846560f95d4d41c;p=userspace-rcu.git

alpha: allocate membarrier system call number

The membarrier syscall has been allocated in Linux 4.13, allocate its
number in our architecture header if the system headers don't allocate
it.

Change-Id: Iebb77b94bf803a7a8b7ebd9f4124219f386334ae
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/include/urcu/arch/alpha.h b/include/urcu/arch/alpha.h
index e61f82c..dc33e28 100644
--- a/include/urcu/arch/alpha.h
+++ b/include/urcu/arch/alpha.h
@@ -33,6 +33,14 @@ extern "C" {
 #define cmm_wmb()			__asm__ __volatile__ ("wmb":::"memory")
 #define cmm_read_barrier_depends()	__asm__ __volatile__ ("mb":::"memory")
 
+/*
+ * On Linux, define the membarrier system call number if not yet available in
+ * the system headers.
+ */
+#if (defined(__linux__) && !defined(__NR_membarrier))
+#define __NR_membarrier		517
+#endif
+
 #ifdef __cplusplus
 }
 #endif