Re: [PATCH v4 10/10] test: ftrace: Fix kprobe test for eventfs

[Steven Rostedt <rostedt@goodmis.org>]

On Thu, 13 Jul 2023 17:03:24 +0530
Ajay Kaher <akaher@vmware.com> wrote:

> kprobe_args_char.tc, kprobe_args_string.tc has validation check
> for tracefs_create_dir, for eventfs it should be eventfs_create_dir.
> 
> Signed-off-by: Ajay Kaher <akaher@vmware.com>
> Co-developed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
> Tested-by: Ching-lin Yu <chinglinyu@google.com>
> Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

As this patch as is will break when running on older kernels, I was
wondering if we should do this instead?

diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_char.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_char.tc
index 285b4770efad..ff7499eb98d6 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_char.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_char.tc
@@ -34,14 +34,19 @@ mips*)
 esac
 
 : "Test get argument (1)"
-echo "p:testprobe tracefs_create_dir arg1=+0(${ARG1}):char" > kprobe_events
+if grep -q eventfs_add_dir available_filter_functions; then
+  DIR_NAME="eventfs_add_dir"
+else
+  DIR_NAME="tracefs_create_dir"
+fi
+echo "p:testprobe ${DIR_NAME} arg1=+0(${ARG1}):char" > kprobe_events
 echo 1 > events/kprobes/testprobe/enable
 echo "p:test $FUNCTION_FORK" >> kprobe_events
 grep -qe "testprobe.* arg1='t'" trace
 
 echo 0 > events/kprobes/testprobe/enable
 : "Test get argument (2)"
-echo "p:testprobe tracefs_create_dir arg1=+0(${ARG1}):char arg2=+0(${ARG1}):char[4]" > kprobe_events
+echo "p:testprobe ${DIR_NAME} arg1=+0(${ARG1}):char arg2=+0(${ARG1}):char[4]" > kprobe_events
 echo 1 > events/kprobes/testprobe/enable
 echo "p:test $FUNCTION_FORK" >> kprobe_events
 grep -qe "testprobe.* arg1='t' arg2={'t','e','s','t'}" trace
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc
index a4f8e7c53c1f..a202b2ea4baf 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc
@@ -37,14 +37,19 @@ loongarch*)
 esac
 
 : "Test get argument (1)"
-echo "p:testprobe tracefs_create_dir arg1=+0(${ARG1}):string" > kprobe_events
+if grep -q eventfs_add_dir available_filter_functions; then
+  DIR_NAME="eventfs_add_dir"
+else
+  DIR_NAME="tracefs_create_dir"
+fi
+echo "p:testprobe ${DIR_NAME} arg1=+0(${ARG1}):string" > kprobe_events
 echo 1 > events/kprobes/testprobe/enable
 echo "p:test $FUNCTION_FORK" >> kprobe_events
 grep -qe "testprobe.* arg1=\"test\"" trace
 
 echo 0 > events/kprobes/testprobe/enable
 : "Test get argument (2)"
-echo "p:testprobe tracefs_create_dir arg1=+0(${ARG1}):string arg2=+0(${ARG1}):string" > kprobe_events
+echo "p:testprobe ${DIR_NAME} arg1=+0(${ARG1}):string arg2=+0(${ARG1}):string" > kprobe_events
 echo 1 > events/kprobes/testprobe/enable
 echo "p:test $FUNCTION_FORK" >> kprobe_events
 grep -qe "testprobe.* arg1=\"test\" arg2=\"test\"" trace

-- Steve

> ---
>  .../selftests/ftrace/test.d/kprobe/kprobe_args_char.tc        | 4 ++--
>  .../selftests/ftrace/test.d/kprobe/kprobe_args_string.tc      | 4 ++--
>  2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_char.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_char.tc
> index 285b4770efad..523cfb64539f 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_char.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_char.tc
> @@ -34,14 +34,14 @@ mips*)
>  esac
>  
>  : "Test get argument (1)"
> -echo "p:testprobe tracefs_create_dir arg1=+0(${ARG1}):char" > kprobe_events
> +echo "p:testprobe eventfs_add_dir arg1=+0(${ARG1}):char" > kprobe_events
>  echo 1 > events/kprobes/testprobe/enable
>  echo "p:test $FUNCTION_FORK" >> kprobe_events
>  grep -qe "testprobe.* arg1='t'" trace
>  
>  echo 0 > events/kprobes/testprobe/enable
>  : "Test get argument (2)"
> -echo "p:testprobe tracefs_create_dir arg1=+0(${ARG1}):char arg2=+0(${ARG1}):char[4]" > kprobe_events
> +echo "p:testprobe eventfs_add_dir arg1=+0(${ARG1}):char arg2=+0(${ARG1}):char[4]" > kprobe_events
>  echo 1 > events/kprobes/testprobe/enable
>  echo "p:test $FUNCTION_FORK" >> kprobe_events
>  grep -qe "testprobe.* arg1='t' arg2={'t','e','s','t'}" trace
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc
> index a4f8e7c53c1f..b9f8c3f8bae8 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc
> @@ -37,14 +37,14 @@ loongarch*)
>  esac
>  
>  : "Test get argument (1)"
> -echo "p:testprobe tracefs_create_dir arg1=+0(${ARG1}):string" > kprobe_events
> +echo "p:testprobe eventfs_add_dir arg1=+0(${ARG1}):string" > kprobe_events
>  echo 1 > events/kprobes/testprobe/enable
>  echo "p:test $FUNCTION_FORK" >> kprobe_events
>  grep -qe "testprobe.* arg1=\"test\"" trace
>  
>  echo 0 > events/kprobes/testprobe/enable
>  : "Test get argument (2)"
> -echo "p:testprobe tracefs_create_dir arg1=+0(${ARG1}):string arg2=+0(${ARG1}):string" > kprobe_events
> +echo "p:testprobe eventfs_add_dir arg1=+0(${ARG1}):string arg2=+0(${ARG1}):string" > kprobe_events
>  echo 1 > events/kprobes/testprobe/enable
>  echo "p:test $FUNCTION_FORK" >> kprobe_events
>  grep -qe "testprobe.* arg1=\"test\" arg2=\"test\"" trace