linux-kernel - [PATCH] kernel: Use scnprintf() in show_smt

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Date:   Tue,  1 Sep 2020 17:49:30 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     tglx@...utronix.de, qais.yousef@....com, peterz@...radead.org,
        cai@....pw, mingo@...nel.org, ethp@...com, tyhicks@...onical.com,
        arnd@...db.de
Cc:     Shuah Khan <skhan@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] kernel: Use scnprintf() in show_smt_*() instead of snprintf()

Since snprintf() returns would-be-output size instead of the actual
output size, replace it with scnprintf(), so the show_smt_control(),
and show_smt_active() routines return the actual size.

Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
---
 kernel/cpu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 6ff2578ecf17..29a5ceb93cda 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -2334,7 +2334,7 @@ show_smt_control(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	const char *state = smt_states[cpu_smt_control];
 
-	return snprintf(buf, PAGE_SIZE - 2, "%s\n", state);
+	return scnprintf(buf, PAGE_SIZE - 2, "%s\n", state);
 }
 
 static ssize_t
@@ -2348,7 +2348,7 @@ static DEVICE_ATTR(control, 0644, show_smt_control, store_smt_control);
 static ssize_t
 show_smt_active(struct device *dev, struct device_attribute *attr, char *buf)
 {
-	return snprintf(buf, PAGE_SIZE - 2, "%d\n", sched_smt_active());
+	return scnprintf(buf, PAGE_SIZE - 2, "%d\n", sched_smt_active());
 }
 static DEVICE_ATTR(active, 0444, show_smt_active, NULL);
 
-- 
2.25.1