[for-next][PATCH 21/25] tracing: Fix some checker warnings

[Steven Rostedt]

From: David Howells <dhowells@xxxxxxxxxx>

Fix some checker warnings in the trace code by adding __printf attributes
to a number of trace functions and their declarations.

Changes:
========
ver #2)
 - Dropped the fix for the unconditional tracing_max_lat_fops decl[1].

Link: https://lore.kernel.org/r/20221205180617.9b9d3971cbe06ee536603523@xxxxxxxxxx/ [1]
Link: https://lore.kernel.org/r/166992525941.1716618.13740663757583361463.stgit@xxxxxxxxxxxxxxxxxxxxxx/ # v1
Link: https://lkml.kernel.org/r/167023571258.382307.15314866482834835192.stgit@xxxxxxxxxxxxxxxxxxxxxx

Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
---
 include/linux/trace_events.h | 3 ++-
 include/linux/trace_seq.h    | 3 ++-
 kernel/trace/trace.h         | 2 +-
 kernel/trace/trace_output.c  | 5 +++--
 4 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index bb2053246d6a..4342e996bcdb 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -234,7 +234,8 @@ void tracing_record_taskinfo_sched_switch(struct task_struct *prev,
 void tracing_record_cmdline(struct task_struct *task);
 void tracing_record_tgid(struct task_struct *task);
 
-int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...);
+int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
+	 __printf(3, 4);
 
 struct event_filter;
 
diff --git a/include/linux/trace_seq.h b/include/linux/trace_seq.h
index 5a2c650d9e1c..0c4c7587d6c3 100644
--- a/include/linux/trace_seq.h
+++ b/include/linux/trace_seq.h
@@ -97,7 +97,8 @@ extern int trace_seq_hex_dump(struct trace_seq *s, const char *prefix_str,
 			      const void *buf, size_t len, bool ascii);
 
 #else /* CONFIG_TRACING */
-static inline void trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
+static inline __printf(2, 3)
+void trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
 {
 }
 static inline void
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 9dc920b01c17..e46a49269be2 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -614,7 +614,7 @@ void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer,
 bool trace_is_tracepoint_string(const char *str);
 const char *trace_event_format(struct trace_iterator *iter, const char *fmt);
 void trace_check_vprintf(struct trace_iterator *iter, const char *fmt,
-			 va_list ap);
+			 va_list ap) __printf(2, 0);
 
 int trace_empty(struct trace_iterator *iter);
 
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index f0ba97121345..57a13b61f186 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -322,8 +322,9 @@ void trace_event_printf(struct trace_iterator *iter, const char *fmt, ...)
 }
 EXPORT_SYMBOL(trace_event_printf);
 
-static int trace_output_raw(struct trace_iterator *iter, char *name,
-			    char *fmt, va_list ap)
+static __printf(3, 0)
+int trace_output_raw(struct trace_iterator *iter, char *name,
+		     char *fmt, va_list ap)
 {
 	struct trace_seq *s = &iter->seq;
 
-- 
2.35.1