Detect missing symbols used with kallsyms_lookup at compile time

[lttng-modules.git] / include / wrapper / genhd.h

diff --git a/include/wrapper/genhd.h b/include/wrapper/genhd.h
index 30fc5cea60ec75a8bb1b0cf38d7e0657d513e1fb..689803881dbb0f9a950c651d48aa4b9a11e83564 100644 (file)
--- a/include/wrapper/genhd.h
+++ b/include/wrapper/genhd.h
@@ -32,6 +32,19 @@ struct class *wrapper_get_block_class(void)
        return ptr_block_class;
 }
 
+/*
+ * Canary function to check for 'block_class' at compile time.
+ *
+ * From 'include/linux/genhd.h':
+ *
+ *   extern struct class block_class;
+ */
+static inline
+struct class *__canary__get_block_class(void)
+{
+       return &block_class;
+}
+
 static inline
 struct device_type *wrapper_get_disk_type(void)
 {
@@ -45,6 +58,16 @@ struct device_type *wrapper_get_disk_type(void)
        return ptr_disk_type;
 }
 
+/*
+ * No canary for 'disk_type', it's only defined in 'block/genhd.c'.
+ *
+ * static inline
+ * struct device_type *__canary__get_disk_type(void)
+ * {
+ *     return &disk_type;
+ * }
+ */
+
 #else
 
 static inline