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From:   liqiong <liqiong@nfschina.com>
To:     Steven Rostedt <rostedt@goodmis.org>,
        Ingo Molnar <mingo@redhat.com>
Cc:     linux-kernel@vger.kernel.org, hukun@nfschina.com,
        qixu@nfschina.com, yuzhe@nfschina.com, renyu@nfschina.com,
        liqiong <liqiong@nfschina.com>
Subject: [PATCH 2/2] kernel/trace: change "char *" string form to "char []"
Date:   Thu, 12 May 2022 22:32:30 +0800
Message-Id: <20220512143230.28796-1-liqiong@nfschina.com>
Precedence: bulk

The "char []" string form declares a single variable. It is better
than "char *" which creates two variables in the final assembly.

Signed-off-by: liqiong <liqiong@nfschina.com>
---
 kernel/trace/trace.c             | 2 +-
 kernel/trace/trace_events_hist.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index f4de111fa18f..62a3451be0e0 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4249,7 +4249,7 @@ static void print_func_help_header_irq(struct array_buffer *buf, struct seq_file
 				       unsigned int flags)
 {
 	bool tgid = flags & TRACE_ITER_RECORD_TGID;
-	const char *space = "            ";
+	static const char space[] = "            ";
 	int prec = tgid ? 12 : 2;
 
 	print_event_info(buf, m);
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 44db5ba9cabb..6925ea1b08e7 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -4161,7 +4161,7 @@ static int create_val_field(struct hist_trigger_data *hist_data,
 	return __create_val_field(hist_data, val_idx, file, NULL, field_str, 0);
 }
 
-static const char *no_comm = "(no comm)";
+static const char no_comm[] = "(no comm)";
 
 static u64 hist_field_execname(struct hist_field *hist_field,
 			       struct tracing_map_elt *elt,
-- 
2.25.1