From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Mon, 16 Nov 2015 16:31:10 +0000 (-0500)
Subject: hppa: allocate membarrier system call number
X-Git-Tag: v0.9.2~8
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=d43d2eb27c7fd0b92ac6f40560bfb88817b165bf;p=userspace-rcu.git

hppa: allocate membarrier system call number

Now that the membarrier system call is allocated on hppa (parisc),
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/hppa.h b/urcu/arch/hppa.h
index f92b0ab..c8d4d05 100644
--- a/urcu/arch/hppa.h
+++ b/urcu/arch/hppa.h
@@ -32,6 +32,14 @@ extern "C" {
 #include <stdlib.h>
 #include <sys/time.h>
 
+/*
+ * 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		343
+#endif
+
 #define HAS_CAA_GET_CYCLES
 typedef unsigned long caa_cycles_t;