lttng abi documentation: clarify getter usage requirements

[lttng-modules.git] / wrapper / perf.h

diff --git a/wrapper/perf.h b/wrapper/perf.h
index 9a6dbfc03c263cb7777d75e368b8ef360e1efdfe..4a7f6d8582873b9075a021595aea291cec2971b0 100644 (file)
--- a/wrapper/perf.h
+++ b/wrapper/perf.h
@@ -1,15 +1,18 @@
-#ifndef _LTT_WRAPPER_PERF_H
-#define _LTT_WRAPPER_PERF_H
-
-/*
- * Copyright (C) 2011 Mathieu Desnoyers (mathieu.desnoyers@efficios.com)
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
+ * wrapper/perf.h
  *
- * Dual LGPL v2.1/GPL v2 license.
+ * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  */
 
+#ifndef _LTTNG_WRAPPER_PERF_H
+#define _LTTNG_WRAPPER_PERF_H
+
 #include <linux/perf_event.h>
 
-#if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(3,0,99))
+#ifdef CONFIG_PERF_EVENTS
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0))
 static inline struct perf_event *
 wrapper_perf_event_create_kernel_counter(struct perf_event_attr *attr,
                                int cpu,
@@ -18,7 +21,7 @@ wrapper_perf_event_create_kernel_counter(struct perf_event_attr *attr,
 {
        return perf_event_create_kernel_counter(attr, cpu, task, callback, NULL);
 }
-#else
+#else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0)) */
 static inline struct perf_event *
 wrapper_perf_event_create_kernel_counter(struct perf_event_attr *attr,
                                int cpu,
@@ -27,6 +30,8 @@ wrapper_perf_event_create_kernel_counter(struct perf_event_attr *attr,
 {
        return perf_event_create_kernel_counter(attr, cpu, task, callback);
 }
-#endif
+#endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0)) */
+
+#endif /* CONFIG_PERF_EVENTS */
 
-#endif /* _LTT_WRAPPER_PERF_H */
+#endif /* _LTTNG_WRAPPER_PERF_H */