README.md: cleanup formatting for bullet lists

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

diff --git a/wrapper/kallsyms.h b/wrapper/kallsyms.h
index bb45f38a8982f339a47b7372d795d840bfbf292f..e60fe363818243d78885aa15961256d66f3ec4ec 100644 (file)
--- a/wrapper/kallsyms.h
+++ b/wrapper/kallsyms.h
@@ -1,16 +1,30 @@
-#ifndef _LTT_WRAPPER_KALLSYMS_H
-#define _LTT_WRAPPER_KALLSYMS_H
-
-/*
- * Copyright (C) 2011 Avik Sil (avik.sil@linaro.org)
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
+ * wrapper/kallsyms.h
  *
  * wrapper around kallsyms_lookup_name. Implements arch-dependent code for
  * arches where the address of the start of the function body is different
  * from the pointer which can be used to call the function, e.g. ARM THUMB2.
  *
- * Dual LGPL v2.1/GPL v2 license.
+ * Copyright (C) 2011 Avik Sil (avik.sil@linaro.org)
+ * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  */
 
+#ifndef _LTTNG_WRAPPER_KALLSYMS_H
+#define _LTTNG_WRAPPER_KALLSYMS_H
+
+#include <linux/kallsyms.h>
+
+/*
+ * PowerPC ABIv1 needs KALLSYMS_ALL to get the function descriptor,
+ * which is needed to perform the function call.
+ */
+#if defined(CONFIG_PPC64) && (!defined(_CALL_ELF) || _CALL_ELF < 2)
+# ifndef CONFIG_KALLSYMS_ALL
+#  error "LTTng-modules requires CONFIG_KALLSYMS_ALL on PowerPC ABIv1"
+# endif
+#endif
+
 static inline
 unsigned long kallsyms_lookup_funcptr(const char *name)
 {
@@ -25,4 +39,10 @@ unsigned long kallsyms_lookup_funcptr(const char *name)
 #endif
        return addr;
 }
-#endif /* _LTT_WRAPPER_KALLSYMS_H */
+
+static inline
+unsigned long kallsyms_lookup_dataptr(const char *name)
+{
+       return kallsyms_lookup_name(name);
+}
+#endif /* _LTTNG_WRAPPER_KALLSYMS_H */