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[99.79.140.187]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-395c46b5e4dsm2926324a91.6.2026.08.21.04.57.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Aug 2026 04:57:14 -0700 (PDT) From: hanzhijian To: Guenter Roeck Cc: linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org, hanzhijian Subject: [PATCH] hwmon: (pmbus/ibm-cffps) fix format-truncation warning Date: Fri, 21 Aug 2026 19:57:03 +0800 Message-ID: <20260821115703.2017414-1-hanzhijian1991@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" snprintf() with "%02X" and "%04X" specifiers on an int argument triggers -Wformat-truncation (and thus a build failure with CONFIG_WERROR) because GCC assumes the int can hold a value wider than the destination buffer. The value comes from i2c_smbus_read_byte_data() and i2c_smbus_read_word_data(), which return at most 8 and 16 bits respectively, so mask the value to make that explicit and silence the warning. Signed-off-by: hanzhijian --- drivers/hwmon/pmbus/ibm-cffps.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffp= s.c index aad94bcb9..dd7ff3a19 100644 --- a/drivers/hwmon/pmbus/ibm-cffps.c +++ b/drivers/hwmon/pmbus/ibm-cffps.c @@ -166,7 +166,7 @@ static ssize_t ibm_cffps_debugfs_read(struct file *file= , char __user *buf, if (rc < 0) goto unlock; =20 - snprintf(&data[i * 2], 3, "%02X", rc); + snprintf(&data[i * 2], 3, "%02X", rc & 0xff); } =20 rc =3D i * 2; @@ -177,7 +177,7 @@ static ssize_t ibm_cffps_debugfs_read(struct file *file= , char __user *buf, if (rc < 0) goto unlock; =20 - snprintf(&data[i * 4], 5, "%04X", rc); + snprintf(&data[i * 4], 5, "%04X", rc & 0xffff); } =20 rc =3D i * 4; --=20 2.43.0