linux-kernel - [PATCH] trace: code optimization

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Message-Id: <27225bf0ec9b4e2f3d313456aee75e294361d550.1578561009.git.liuyang34@xiaomi.com>
Date:   Thu,  9 Jan 2020 17:12:17 +0800
From:   liuyang34 <yangliuxm34@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Cc:     liuyang34 <liuyang34@...omi.com>
Subject: [PATCH] trace: code optimization

use scnprintf instead of snprinr and no need to check
the return size again

Signed-off-by: liuyang34 <liuyang34@...omi.com>
---
 kernel/trace/trace_stack.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index c557f42..7b15e9a 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -329,9 +329,7 @@ stack_max_size_read(struct file *filp, char __user *ubuf,
 	char buf[64];
 	int r;
 
-	r = snprintf(buf, sizeof(buf), "%ld\n", *ptr);
-	if (r > sizeof(buf))
-		r = sizeof(buf);
+	r = scnprintf(buf, sizeof(buf), "%ld\n", *ptr);
 	return simple_read_from_buffer(ubuf, count, ppos, buf, r);
 }
 
-- 
2.7.4