X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=wrapper%2Fwriteback.h;h=328c9323549ee8aee5ef8711dbab153513b1ad3d;hb=be71b60a327d7ad2588abc5cad2861177119972b;hp=646246621174011aea00ab8e6f353e101208b0c9;hpb=9f36eaed6f91d5897924b551b44d1edd8cee00e2;p=lttng-modules.git

diff --git a/wrapper/writeback.h b/wrapper/writeback.h
index 64624662..328c9323 100644
--- a/wrapper/writeback.h
+++ b/wrapper/writeback.h
@@ -37,7 +37,21 @@ unsigned long wrapper_global_dirty_limit(void)
 		return 0;
 	}
 }
-#else
+
+/*
+ * Canary function to check for 'global_wb_domain' at compile time.
+ *
+ * From 'include/linux/writeback.h':
+ *
+ *   extern struct wb_domain global_wb_domain;
+ */
+static inline
+unsigned long __canary__global_wb_domain(void)
+{
+	return global_wb_domain.dirty_limit;
+}
+
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0)
 
 static unsigned long *global_dirty_limit_sym;
 
@@ -54,17 +68,33 @@ unsigned long wrapper_global_dirty_limit(void)
 		return 0;
 	}
 }
+
+/*
+ * Canary function to check for 'global_dirty_limit' at compile time.
+ *
+ * From 'include/linux/writeback.h':
+ *
+ *   extern unsigned long global_dirty_limit;
+ */
+static inline
+unsigned long __canary__global_dirty_limit(void)
+{
+	return global_dirty_limit;
+}
+
 #endif
 
 #else /* CONFIG_KALLSYMS_ALL */
 
 #include <linux/writeback.h>
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0)
 static inline
 unsigned long wrapper_global_dirty_limit(void)
 {
 	return global_dirty_limit;
 }
+#endif
 
 #endif