tools/gpio/gpio-event-mon: fix warning

Message ID
State Accepted
Commit 03fd11b0336239b7c8c5dac07cef3a71fe33b16b
Headers show
  • tools/gpio/gpio-event-mon: fix warning
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Commit Message

Anders Roxell Feb. 21, 2018, 9:33 p.m.
PRIu64 is defined in user space to match libc's uint64_t definition.
However, gpioevent_data structure in the kernel is defined using the
kernel's own __u64 type.

gpio-event-mon.c: In function ‘monitor_device’:
gpio-event-mon.c:102:19: warning: format ‘%lu’ expects argument of type
    ‘long unsigned int’, but argument 3 has type ‘__u64 {aka long long
    unsigned int}’ [-Wformat=]
   fprintf(stdout, "GPIO EVENT %" PRIu64 ": ", event.timestamp);
  LD       /tmp/kselftest/gpiogpio-event-mon-in.o
  LINK     /tmp/kselftest/gpiogpio-event-mon

Fix is to replace PRIu64 with llu, which we know is what the kernel uses
for __u64.

Signed-off-by: Anders Roxell <>

 tools/gpio/gpio-event-mon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


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diff --git a/tools/gpio/gpio-event-mon.c b/tools/gpio/gpio-event-mon.c
index dac4d4131d9b..c864544efe05 100644
--- a/tools/gpio/gpio-event-mon.c
+++ b/tools/gpio/gpio-event-mon.c
@@ -99,7 +99,7 @@  int monitor_device(const char *device_name,
 			ret = -EIO;
-		fprintf(stdout, "GPIO EVENT %" PRIu64 ": ", event.timestamp);
+		fprintf(stdout, "GPIO EVENT %llu: ", event.timestamp);
 		switch ( {
 			fprintf(stdout, "rising edge");