5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
[ Upstream commit ff50f53276131a3059e8307d11293af388ed2bcd ]
In order to teach the compiler that 'trig->name' will never be truncated,
we need to tell it that 'cpu' is not negative.
When building with W=1, this fixes the following warnings:
drivers/leds/trigger/ledtrig-cpu.c: In function ‘ledtrig_cpu_init’:
drivers/leds/trigger/ledtrig-cpu.c:155:56: error: ‘%d’ directive output may be truncated writing between 1 and 11 bytes into a region of size 5 [-Werror=format-truncation=]
155 | snprintf(trig->name, MAX_NAME_LEN, "cpu%d", cpu);
| ^~
drivers/leds/trigger/ledtrig-cpu.c:155:52: note: directive argument in the range [-2147483648, 7]
155 | snprintf(trig->name, MAX_NAME_LEN, "cpu%d", cpu);
| ^~~~~~~
drivers/leds/trigger/ledtrig-cpu.c:155:17: note: ‘snprintf’ output between 5 and 15 bytes into a destination of size 8
155 | snprintf(trig->name, MAX_NAME_LEN, "cpu%d", cpu);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Fixes: 8f88731d052d ("led-triggers: create a trigger for CPU activity")
Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Link: https://lore.kernel.org/r/3f4be7a99933cf8566e630da54f6ab913caac432.1695453322.git.christophe.jaillet@xxxxxxxxxx
Signed-off-by: Lee Jones <lee@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/leds/trigger/ledtrig-cpu.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/leds/trigger/ledtrig-cpu.c b/drivers/leds/trigger/ledtrig-cpu.c
index 8af4f9bb9cde8..05848a2fecff6 100644
--- a/drivers/leds/trigger/ledtrig-cpu.c
+++ b/drivers/leds/trigger/ledtrig-cpu.c
@@ -130,7 +130,7 @@ static int ledtrig_prepare_down_cpu(unsigned int cpu)
static int __init ledtrig_cpu_init(void)
{
- int cpu;
+ unsigned int cpu;
int ret;
/* Supports up to 9999 cpu cores */
@@ -152,7 +152,7 @@ static int __init ledtrig_cpu_init(void)
if (cpu >= 8)
continue;
- snprintf(trig->name, MAX_NAME_LEN, "cpu%d", cpu);
+ snprintf(trig->name, MAX_NAME_LEN, "cpu%u", cpu);
led_trigger_register_simple(trig->name, &trig->_trig);
}
--
2.42.0
