1 files changed, 21 insertions, 0 deletions

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 1c9cdca02580..1cc8ca453a9b 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -225,6 +225,27 @@ extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);
 
 #ifdef CONFIG_TRACE_BPRINTK
 extern int trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
+extern int __trace_bprintk(unsigned long ip, const char *fmt, ...)
+                __attribute__ ((format (printf, 2, 3)));
+
+static inline void  ____trace_bprintk_check_format(const char *fmt, ...)
+                __attribute__ ((format (printf, 1, 2)));
+static inline void ____trace_bprintk_check_format(const char *fmt, ...) {}
+#define __trace_bprintk_check_format(fmt, args...)                      \
+do {                                                                    \
+        if (0)                                                          \
+                ____trace_bprintk_check_format(fmt, ##args);            \
+} while (0)
+
+#define trace_bprintk(fmt, args...)                                     \
+do {                                                                    \
+        static char *__attribute__((section("__trace_bprintk_fmt")))    \
+                        trace_bprintk_fmt = fmt;                        \
+        __trace_bprintk_check_format(fmt, ##args);                      \
+        __trace_bprintk(_THIS_IP_, trace_bprintk_fmt, ##args);  \
+} while (0)
+#else
+#define trace_bprintk trace_printk
 #endif
 
 /* May be defined in arch */