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From: Viresh Kumar <viresh.kumar@linaro.org>
To: "Rafael J. Wysocki" <rafael@kernel.org>,
	Yangtao Li <tiny.windzz@gmail.com>,
	Viresh Kumar <viresh.kumar@linaro.org>,
	Chen-Yu Tsai <wens@csie.org>,
	Jernej Skrabec <jernej.skrabec@gmail.com>,
	Samuel Holland <samuel@sholland.org>
Cc: linux-pm@vger.kernel.org,
	Vincent Guittot <vincent.guittot@linaro.org>,
	kernel test robot <lkp@intel.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-sunxi@lists.linux.dev,
	linux-kernel@vger.kernel.org
Subject: [PATCH] cpufreq: sun50i: Fix build warning around snprint()
Date: Mon, 22 Apr 2024 09:01:09 +0530
Message-Id: <285de20a187f3e4baeb28f639b5bf55e914a3821.1713756666.git.viresh.kumar@linaro.org>
Precedence: bulk
MIME-Version: 1.0
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The Sun50i driver generates a warning with W=1:

warning: '%d' directive output may be truncated writing between 1 and 10 bytes into a region of size 2 [-Wformat-truncation=]

Fix it by allocating a big enough array to print an integer.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202404191715.LDwMm2gP-lkp@intel.com/
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 drivers/cpufreq/sun50i-cpufreq-nvmem.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/cpufreq/sun50i-cpufreq-nvmem.c b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
index 30e5c337611c..cd50cea16a87 100644
--- a/drivers/cpufreq/sun50i-cpufreq-nvmem.c
+++ b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
@@ -19,8 +19,6 @@
 #include <linux/pm_opp.h>
 #include <linux/slab.h>
 
-#define MAX_NAME_LEN	7
-
 #define NVMEM_MASK	0x7
 #define NVMEM_SHIFT	5
 
@@ -208,7 +206,7 @@ static int sun50i_cpufreq_get_efuse(void)
 static int sun50i_cpufreq_nvmem_probe(struct platform_device *pdev)
 {
 	int *opp_tokens;
-	char name[MAX_NAME_LEN];
+	char name[] = "speedXXXXXXXXXXX"; /* Integers can take 11 chars max */
 	unsigned int cpu, supported_hw;
 	struct dev_pm_opp_config config = {};
 	int speed;
@@ -235,7 +233,7 @@ static int sun50i_cpufreq_nvmem_probe(struct platform_device *pdev)
 		config.supported_hw_count = 1;
 	}
 
-	snprintf(name, MAX_NAME_LEN, "speed%d", speed);
+	snprintf(name, sizeof(name), "speed%d", speed);
 	config.prop_name = name;
 
 	for_each_possible_cpu(cpu) {
-- 
2.31.1.272.g89b43f80a514