X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=instrumentation%2Fevents%2Flttng-module%2Fwriteback.h;h=6633e239aea8f9997e51897e86bacc81ee012c4e;hb=d894b241ef50eca2f9a8f77334e692d816341c7f;hp=c988a9d7e83eb3440a305135ecb477d55a0f3d2d;hpb=43b2b999b5f184f3b42c8c9c790f46ee794a894c;p=lttng-modules.git

diff --git a/instrumentation/events/lttng-module/writeback.h b/instrumentation/events/lttng-module/writeback.h
index c988a9d7..6633e239 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);