X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=wrapper%2Fgenhd.h;h=98feb57bebde635fb11781209ca2871a8faafa0c;hb=9e52289bbd4698c76a4c6bf66d92ce04accdd54a;hp=4eac2c1a14c62ed74a316a98ff4228f4478352da;hpb=bf5a011d7256c26f8731be6b9983462f02b7c0cb;p=lttng-modules.git

diff --git a/wrapper/genhd.h b/wrapper/genhd.h
index 4eac2c1a..98feb57b 100644
--- a/wrapper/genhd.h
+++ b/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