linux-kernel - [PATCH 4/7] x86: events: Convert snprintf() to scnprintf()

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Date:   Mon, 26 Sep 2022 19:45:53 +0100
From:   Jules Irenge <jbi.octave@...il.com>
To:     mark.rutland@....com
Cc:     alexander.shishkin@...ux.intel.com, tglx@...utronix.de,
        bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org,
        hpa@...or.com, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, elana.copperman@...ileye.com
Subject: [PATCH 4/7] x86: events: Convert snprintf() to scnprintf()

Coccinnelle reports a warning
Warning: Use scnprintf or sprintf
Adding to that, there has been a slow migration from snprintf to scnprintf.
This LWN article explains the rationale for this change
https: //lwn.net/Articles/69419/
Ie. snprintf() returns what *would* be the resulting length,
while scnprintf() returns the actual length.

Signed-off-by: Jules Irenge <jbi.octave@...il.com>
---
 arch/x86/events/core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index f969410d0c90..71695d21ffd1 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -1905,7 +1905,7 @@ ssize_t events_hybrid_sysfs_show(struct device *dev,
 		if (x86_pmu.hybrid_pmu[i].cpu_type & pmu->cpu_type) {
 			next_str = strchr(str, ';');
 			if (next_str)
-				return snprintf(page, next_str - str + 1, "%s", str);
+				return scnprintf(page, next_str - str + 1, "%s", str);
 			else
 				return sprintf(page, "%s", str);
 		}
@@ -2566,7 +2566,7 @@ static ssize_t get_attr_rdpmc(struct device *cdev,
 			      struct device_attribute *attr,
 			      char *buf)
 {
-	return snprintf(buf, 40, "%d\n", x86_pmu.attr_rdpmc);
+	return scnprintf(buf, 40, "%d\n", x86_pmu.attr_rdpmc);
 }
 
 static ssize_t set_attr_rdpmc(struct device *cdev,
@@ -2624,7 +2624,7 @@ static ssize_t max_precise_show(struct device *cdev,
 				  struct device_attribute *attr,
 				  char *buf)
 {
-	return snprintf(buf, PAGE_SIZE, "%d\n", x86_pmu_max_precise());
+	return scnprintf(buf, PAGE_SIZE, "%d\n", x86_pmu_max_precise());
 }
 
 static DEVICE_ATTR_RO(max_precise);
-- 
2.37.3