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* [PATCH] selftests/ftrace: Check the first record for kprobe_args_type.tc
@ 2020-04-07  6:34 Xiao Yang
  2020-04-07 13:54 ` Steven Rostedt
  0 siblings, 1 reply; 8+ messages in thread
From: Xiao Yang @ 2020-04-07  6:34 UTC (permalink / raw)
  To: rostedt, mingo; +Cc: shuah, ice_yangxiao, linux-kselftest, Xiao Yang

It is possible to get multiple records from trace during test and then more
than 4 arguments are assigned to ARGS.  This situation results in the failure
of kprobe_args_type.tc.  For example:
-----------------------------------------------------------
grep testprobe trace
   ftracetest-5902  [001] d... 111195.682227: testprobe: (_do_fork+0x0/0x460) arg1=334823024 arg2=334823024 arg3=0x13f4fe70 arg4=7
     pmlogger-5949  [000] d... 111195.709898: testprobe: (_do_fork+0x0/0x460) arg1=345308784 arg2=345308784 arg3=0x1494fe70 arg4=7
 grep testprobe trace
 sed -e 's/.* arg1=\(.*\) arg2=\(.*\) arg3=\(.*\) arg4=\(.*\)/\1 \2 \3 \4/'
ARGS='334823024 334823024 0x13f4fe70 7
345308784 345308784 0x1494fe70 7'
-----------------------------------------------------------

We don't care which process calls do_fork so just check the first record to
fix the issue.

Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
---
 .../testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
index 1bcb67dcae26..81490ecaaa92 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
@@ -38,7 +38,7 @@ for width in 64 32 16 8; do
   echo 0 > events/kprobes/testprobe/enable
 
   : "Confirm the arguments is recorded in given types correctly"
-  ARGS=`grep "testprobe" trace | sed -e 's/.* arg1=\(.*\) arg2=\(.*\) arg3=\(.*\) arg4=\(.*\)/\1 \2 \3 \4/'`
+  ARGS=`grep "testprobe" trace | head -n 1 | sed -e 's/.* arg1=\(.*\) arg2=\(.*\) arg3=\(.*\) arg4=\(.*\)/\1 \2 \3 \4/'`
   check_types $ARGS $width
 
   : "Clear event for next loop"
-- 
2.25.1




^ permalink raw reply related	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2020-04-24 12:22 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2020-04-07  6:34 [PATCH] selftests/ftrace: Check the first record for kprobe_args_type.tc Xiao Yang
2020-04-07 13:54 ` Steven Rostedt
2020-04-07 15:30   ` Masami Hiramatsu
2020-04-15  1:19     ` Xiao Yang
2020-04-24  1:12       ` Xiao Yang
2020-04-24  1:18         ` Steven Rostedt
2020-04-24  1:36           ` Xiao Yang
2020-04-24 12:22             ` Shuah Khan

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