linux-kernel - [PATCH v2 1/3] tracing: merge seq_print_sym_short() and seq_print_sym

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Message-Id: <20181029223542.26175-2-linux@rasmusvillemoes.dk>
Date:   Mon, 29 Oct 2018 23:35:40 +0100
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 v2 1/3] tracing: merge seq_print_sym_short() and seq_print_sym_offset()

These two functions are nearly identical, so we can avoid some code
duplication by moving the conditional into a common implementation.

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 kernel/trace/trace_output.c | 34 +++++++---------------------------
 1 file changed, 7 insertions(+), 27 deletions(-)

diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 6e6cc64faa38..85ecd061c7be 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -339,34 +339,17 @@ static inline const char *kretprobed(const char *name)
 #endif /* CONFIG_KRETPROBES */
 
 static void
-seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
+seq_print_sym(struct trace_seq *s, const char *fmt, unsigned long address,
+	      bool offset)
 {
 	char str[KSYM_SYMBOL_LEN];
 #ifdef CONFIG_KALLSYMS
 	const char *name;
 
-	kallsyms_lookup(address, NULL, NULL, NULL, str);
-
-	name = kretprobed(str);
-
-	if (name && strlen(name)) {
-		trace_seq_printf(s, fmt, name);
-		return;
-	}
-#endif
-	snprintf(str, KSYM_SYMBOL_LEN, "0x%08lx", address);
-	trace_seq_printf(s, fmt, str);
-}
-
-static void
-seq_print_sym_offset(struct trace_seq *s, const char *fmt,
-		     unsigned long address)
-{
-	char str[KSYM_SYMBOL_LEN];
-#ifdef CONFIG_KALLSYMS
-	const char *name;
-
-	sprint_symbol(str, address);
+	if (offset)
+		sprint_symbol(str, address);
+	else
+		kallsyms_lookup(address, NULL, NULL, NULL, str);
 	name = kretprobed(str);
 
 	if (name && strlen(name)) {
@@ -424,10 +407,7 @@ seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 		goto out;
 	}
 
-	if (sym_flags & TRACE_ITER_SYM_OFFSET)
-		seq_print_sym_offset(s, "%s", ip);
-	else
-		seq_print_sym_short(s, "%s", ip);
+	seq_print_sym(s, "%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