4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Christophe JAILLET christophe.jaillet@wanadoo.fr
[ 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@wanadoo.fr Link: https://lore.kernel.org/r/3f4be7a99933cf8566e630da54f6ab913caac432.169545332... Signed-off-by: Lee Jones lee@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 1fca1ad00c3b9..19e068cadedfb 100644 --- a/drivers/leds/trigger/ledtrig-cpu.c +++ b/drivers/leds/trigger/ledtrig-cpu.c @@ -134,7 +134,7 @@ 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 */ @@ -156,7 +156,7 @@ 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); }