diff mbox series

time: Ignore interval nanoseconds on tst-itimer

Message ID 20210713141742.2717549-1-adhemerval.zanella@linaro.org
State New
Headers show
Series time: Ignore interval nanoseconds on tst-itimer | expand

Commit Message

Adhemerval Zanella Netto July 13, 2021, 2:17 p.m. UTC 
Running the test on a 4.4 kernel within KVM, the precision used on
ITIMER_VIRTUAL and ITIMER_PROF seems to different than the one used
for ITIMER_REAL (it seems the same used for CLOCK_REALTIME_COARSE and
CLOCK_MONOTONIC_COARSE).  I did not see it on other kernels, for
instance 5.11 and 4.15.

To avoid trying to guess the resolution used, do not check the
nanosecond internal values for the specific timers.

Checked on i686-linux-gnu with a 4.4 kernel.
---
 time/tst-itimer.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/time/tst-itimer.c b/time/tst-itimer.c
index 929c2b74c7..554caa75f2 100644
--- a/time/tst-itimer.c
+++ b/time/tst-itimer.c
@@ -74,6 +74,9 @@  do_test (void)
 	{
 	  TEST_COMPARE (it_old.it_interval.tv_sec, 10);
 	  TEST_COMPARE (it_old.it_interval.tv_usec, 20);
+	  /* Some systems might use a different precision for ITIMER_VIRTUAL
+	     and ITIMER_iPROF and thus the value might be adjusted.  To avoid
+	     trying to guess the resolution, we do not check it.  */
 	}
 
       /* Create a periodic timer and check if the return value is the one
@@ -87,7 +90,8 @@  do_test (void)
       TEST_COMPARE (setitimer (timers[i], &(struct itimerval) { 0 }, &it_old),
 		    0);
       TEST_COMPARE (it.it_interval.tv_sec, it_old.it_interval.tv_sec);
-      TEST_COMPARE (it.it_interval.tv_usec, it_old.it_interval.tv_usec);
+      if (timers[i] == ITIMER_REAL)
+	TEST_COMPARE (it.it_interval.tv_usec, it_old.it_interval.tv_usec);
 
       if (sizeof (time_t) == 4)
 	continue;