When multiple callbacks are registered on the same tracepoint, probestub
will be indirectly called via traceiter helper.

Pointer to probestub callback resides in __tracepoints section, which is
excluded from ENDBR checks in objtool. Pointers to regfunc/unregfunc
callbacks reside in extended structure however, which is not affected.

Registering multiple callbacks will result in a #CP exception due to
missed ENDBR in __probestub helper on a CFI-enabled machine.

Fix this by adding CFI_NOSEAL annotation to probestub declaration.

Fixes: d5173f753750 ("objtool: Exclude __tracepoints data from ENDBR checks")
Signed-off-by: Eva Kurchatova <eva.kurchatova@virtuozzo.com>
---
 include/linux/tracepoint.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 583d962abcc3..5a32a709759c 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -19,6 +19,7 @@
 #include <linux/rcupdate.h>
 #include <linux/tracepoint-defs.h>
 #include <linux/static_call.h>
+#include <asm/cfi.h>
 
 struct module;
 struct tracepoint;
@@ -356,6 +357,7 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
 	void __probestub_##_name(void *__data, proto)			\
 	{								\
 	}								\
+	CFI_NOSEAL(__probestub_##_name);				\
 	DEFINE_STATIC_CALL(tp_func_##_name, __traceiter_##_name);
 
 #define DEFINE_TRACE_FN(_name, _reg, _unreg, _proto, _args)		\
-- 
2.54.0