linux-kernel - [PATCH 2/3] tracing: avoid -Wformat-nonliteral warning

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Date:   Fri, 26 Oct 2018 23:13:45 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] tracing: avoid -Wformat-nonliteral warning

Building with -Wformat-nonliteral, gcc complains

kernel/trace/trace_output.c: In function ‘seq_print_sym’:
kernel/trace/trace_output.c:356:3: warning: format not a string literal, argument types not checked [-Wformat-nonliteral]
   trace_seq_printf(s, fmt, name);

But seq_print_sym only has a single caller which passes "%s" as fmt, so
we might as well just use that directly. That also paves the way for
further cleanups that will actually make that format string go away
entirely.

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 kernel/trace/trace_output.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 501311dcfca6..7417ce5fe4bb 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -339,8 +339,7 @@ static inline const char *kretprobed(const char *name)
 #endif /* CONFIG_KRETPROBES */
 
 static void
-seq_print_sym(struct trace_seq *s, const char *fmt, unsigned long address,
-	      bool with_offset)
+seq_print_sym(struct trace_seq *s, unsigned long address, bool with_offset)
 {
 	char str[KSYM_SYMBOL_LEN];
 #ifdef CONFIG_KALLSYMS
@@ -353,12 +352,12 @@ seq_print_sym(struct trace_seq *s, const char *fmt, unsigned long address,
 	name = kretprobed(str);
 
 	if (name && strlen(name)) {
-		trace_seq_printf(s, fmt, name);
+		trace_seq_printf(s, "%s", name);
 		return;
 	}
 #endif
 	snprintf(str, KSYM_SYMBOL_LEN, "0x%08lx", address);
-	trace_seq_printf(s, fmt, str);
+	trace_seq_printf(s, "%s", str);
 }
 
 #ifndef CONFIG_64BIT
@@ -407,7 +406,7 @@ seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 		goto out;
 	}
 
-	seq_print_sym(s, "%s", ip, sym_flags & TRACE_ITER_SYM_OFFSET);
+	seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET);
 
 	if (sym_flags & TRACE_ITER_SYM_ADDR)
 		trace_seq_printf(s, " <" IP_FMT ">", ip);
-- 
2.19.1.6.gbde171bbf5