[PATCH] selftests/ftrace: Use long for synthetic event probe test

[PATCH] selftests/ftrace: Use long for synthetic event probe test

[Steven Rostedt]

From 8bb1734388b89bdb2ac176882786dc02b7df92c2 Mon Sep 17 00:00:00 2001
From: "Steven Rostedt (Google)" <rostedt@goodmis.org>
Date: Wed, 30 Nov 2022 17:31:34 -0500
Subject: [PATCH] selftests/ftrace: Use long for synthetic event probe test

On 32bit the trigger-synthetic-eprobe.tc selftest fails with the error:

hist:syscalls:sys_exit_openat: error: Param type doesn't match synthetic event field type
  Command: hist:keys=common_pid:filename=$__arg__1,ret=ret:onmatch(syscalls.sys_enter_openat).trace(synth_open,$filename,$ret)
                                                                                                               ^
This is because the synth_open synthetic event is created with:

  echo "$SYNTH u64 filename; s64 ret;" > synthetic_events

Which works fine on 64 bit, as filename is a pointer and the return is
also a long. But for 32 bit architectures, it doesn't work.

Use "unsigned long" and "long" instead so that it works for both 64 bit
and 32 bit architectures.

Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
---
 .../test.d/trigger/inter-event/trigger-synthetic-eprobe.tc      | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-eprobe.tc b/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-eprobe.tc
index 6461c375694f..c2a8ab01e13b 100644
--- a/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-eprobe.tc
+++ b/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-eprobe.tc
@@ -14,7 +14,7 @@ FIELD="filename"
 SYNTH="synth_open"
 EPROBE="eprobe_open"
 
-echo "$SYNTH u64 filename; s64 ret;" > synthetic_events
+echo "$SYNTH unsigned long filename; long ret;" > synthetic_events
 echo "hist:keys=common_pid:__arg__1=$FIELD" > events/$SYSTEM/$START/trigger
 echo "hist:keys=common_pid:filename=\$__arg__1,ret=ret:onmatch($SYSTEM.$START).trace($SYNTH,\$filename,\$ret)" > events/$SYSTEM/$END/trigger
 
-- 
2.35.1

Re: [PATCH] selftests/ftrace: Use long for synthetic event probe test

[Shuah Khan]

On 12/2/22 10:03, Steven Rostedt wrote:
>  From 8bb1734388b89bdb2ac176882786dc02b7df92c2 Mon Sep 17 00:00:00 2001

Steve,

git am doesn't like the line above and I get "Patch is empty"
error.

I had to manually remove this to apply the patch to linux-kselftest
next for the merge window.

Please check if there is something in your workflow that adds this
problematic line.

thanks,
-- Shuah

Re: [PATCH] selftests/ftrace: Use long for synthetic event probe test

[Steven Rostedt]

On Fri, 2 Dec 2022 10:56:18 -0700
Shuah Khan <skhan@linuxfoundation.org> wrote:

> On 12/2/22 10:03, Steven Rostedt wrote:
> >  From 8bb1734388b89bdb2ac176882786dc02b7df92c2 Mon Sep 17 00:00:00 2001  
> 
> Steve,
> 
> git am doesn't like the line above and I get "Patch is empty"
> error.
> 
> I had to manually remove this to apply the patch to linux-kselftest
> next for the merge window.
> 
> Please check if there is something in your workflow that adds this
> problematic line.
> 

When I do single patches, I just insert the format-patch output directly,
and sometimes I forget to trim it :-/

Thanks,

-- Steve