X-Git-Url: https://git.liburcu.org/?p=ust.git;a=blobdiff_plain;f=include%2Fust%2Ftracepoint.h;h=b11d69d7c039ee7454c0151e39b31f4ac5faa61c;hp=b9557d5703e91ff4082e241e567edc0d8e521d05;hb=332b3a18ea9e3be7ec5d65a4d75c5cf2b6a59525;hpb=1c330d13895139a60bb47a0efba1f50af080cf59

diff --git a/include/ust/tracepoint.h b/include/ust/tracepoint.h
index b9557d5..b11d69d 100644
--- a/include/ust/tracepoint.h
+++ b/include/ust/tracepoint.h
@@ -116,13 +116,17 @@ struct tracepoint {
 						   data);		\
 	}
 
+/*
+ * __tracepoints_ptrs section is not const (read-only) to let the linker update
+ * the pointer, allowing PIC code.
+ */
 #define DEFINE_TRACEPOINT_FN(name, reg, unreg)				\
 	static const char __tpstrtab_##name[]				\
 	__attribute__((section("__tracepoints_strings"))) = #name;	\
 	struct tracepoint __tracepoint_##name				\
 	__attribute__((section("__tracepoints"))) =			\
 		{ __tpstrtab_##name, 0, NULL };				\
-	static struct tracepoint * const __tracepoint_ptr_##name	\
+	static struct tracepoint * __tracepoint_ptr_##name		\
 	__attribute__((used, section("__tracepoints_ptrs"))) =		\
 		&__tracepoint_##name;
 
@@ -231,8 +235,8 @@ extern int tracepoint_unregister_lib(struct tracepoint * const *tracepoints_star
 #define TRACEPOINT_LIB							\
 	extern struct tracepoint * const __start___tracepoints_ptrs[] __attribute__((weak, visibility("hidden"))); \
 	extern struct tracepoint * const __stop___tracepoints_ptrs[] __attribute__((weak, visibility("hidden"))); \
-	static struct tracepoint * const __tracepoint_ptr_dummy		\
-	__attribute__((used, section("__tracepoints_ptrs"))) = NULL;	\
+	static struct tracepoint * __tracepoint_ptr_dummy		\
+	__attribute__((used, section("__tracepoints_ptrs")));		\
 	static void __attribute__((constructor)) __tracepoints__init(void)	\
 	{									\
 		tracepoint_register_lib(__start___tracepoints_ptrs,			\
@@ -388,8 +392,8 @@ extern int trace_event_unregister_lib(struct trace_event * const *start_trace_ev
 	__attribute__((weak, visibility("hidden")));			\
 	extern struct trace_event * const __stop___trace_events_ptrs[]	\
 	__attribute__((weak, visibility("hidden")));			\
-	static struct trace_event * const __event_ptrs_dummy		\
-	__attribute__((used, section("__trace_events_ptrs"))) =	NULL;	\
+	static struct trace_event * __event_ptrs_dummy			\
+	__attribute__((used, section("__trace_events_ptrs")));		\
 	static void __attribute__((constructor))			\
 	__trace_events__init(void)					\
 	{								\