X-Git-Url: https://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=include%2Furcu%2Farch%2Falpha.h;fp=include%2Furcu%2Farch%2Falpha.h;h=dc33e28d3c1966863bff4775a4bc308f4e179cb4;hp=e61f82c0728047528acf484d74cf7011a892914c;hb=192ea849f267a236eef52e649846560f95d4d41c;hpb=5beb55483ae6baa9ebc7d65bbd00dbef6e40b6b1

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