alpha: allocate membarrier system call number

[urcu.git] / include / urcu / arch / alpha.h

diff --git a/include/urcu/arch/alpha.h b/include/urcu/arch/alpha.h
index e61f82c0728047528acf484d74cf7011a892914c..dc33e28d3c1966863bff4775a4bc308f4e179cb4 100644 (file)
--- 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")
 
 #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
 #ifdef __cplusplus
 }
 #endif