X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=instrumentation%2Fevents%2Flttng-module%2Fwriteback.h;h=9ce9a421c7f86d7c04c3c0a0e41e2bb13b67249c;hb=3b158f7bbdd6eb7d64c954ead046e1ebc6fca559;hp=d6791e35a65d14f327416cdd374c50c92854246d;hpb=1461bc670ad19139b2815713e3e78c32476a1806;p=lttng-modules.git

diff --git a/instrumentation/events/lttng-module/writeback.h b/instrumentation/events/lttng-module/writeback.h
index d6791e35..9ce9a421 100644
--- a/instrumentation/events/lttng-module/writeback.h
+++ b/instrumentation/events/lttng-module/writeback.h
@@ -14,9 +14,12 @@
 #ifndef _TRACE_WRITEBACK_DEF_
 #define _TRACE_WRITEBACK_DEF_
 
-#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,6,0) ||	\
-	LTTNG_KERNEL_RANGE(5,5,3, 5,6,0) ||			\
-	LTTNG_KERNEL_RANGE(5,4,19, 5,5,0))
+/*
+ * Use the GPL-exported bdi_dev_name introduced in kernel 5.7. Do not use
+ * static inline bdi_dev_name in prior kernels because it uses the bdi_unknown_name
+ * symbol which is not exported to GPL modules.
+ */
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,7,0))
 static inline const char *lttng_bdi_dev_name(struct backing_dev_info *bdi)
 {
 	return bdi_dev_name(bdi);