X-Git-Url: https://git.liburcu.org/?a=blobdiff_plain;f=include%2Furcu%2Farch%2Falpha.h;h=db7ab3eb55e3228b29d0a32287c85922cfe3c886;hb=HEAD;hp=e61f82c0728047528acf484d74cf7011a892914c;hpb=6893800a4d1cc14dff0395ddcd660a5138db183d;p=urcu.git

diff --git a/include/urcu/arch/alpha.h b/include/urcu/arch/alpha.h
index e61f82c..db7ab3e 100644
--- a/include/urcu/arch/alpha.h
+++ b/include/urcu/arch/alpha.h
@@ -1,24 +1,12 @@
+// SPDX-FileCopyrightText: 2010 Paolo Bonzini <pbonzini@redhat.com>
+//
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 #ifndef _URCU_ARCH_ALPHA_H
 #define _URCU_ARCH_ALPHA_H
 
 /*
  * arch_alpha.h: trivial definitions for the Alpha architecture.
- *
- * Copyright (c) 2010 Paolo Bonzini <pbonzini@redhat.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <urcu/compiler.h>
@@ -33,6 +21,14 @@ 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