linux-kernel - Re: [PATCH v2 3/4] selftests/ftrace: Update multiple kprobes test for powerpc

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Message-Id: <20170703122852.c7f94b042bdb5a20a5316b0f@kernel.org>
Date:   Mon, 3 Jul 2017 12:28:52 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Shuah Khan <shuah@...nel.org>, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/4] selftests/ftrace: Update multiple kprobes test
 for powerpc

On Thu, 29 Jun 2017 19:05:38 +0530
"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com> wrote:

> KPROBES_ON_FTRACE is only available on powerpc64le. Update comment to
> clarify this.
> 
> Also, we should use an offset of 8 to ensure that the probe does not
> fall on ftrace location. The current offset of 4 will fall before the
> function local entry point and won't fire, while an offset of 12 or 16
> will fall on ftrace location. Offset 8 is currently guaranteed to not be
> the ftrace location.

OK, looks good to me.

Acked-by: Masami Hiramatsu <mhiramat@...nel.org>

Thanks!

> 
> Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
> ---
>  tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc b/tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc
> index f4d1ff785d67..2a1cb9908746 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc
> @@ -2,10 +2,10 @@
>  # description: Register/unregister many kprobe events
>  
>  # ftrace fentry skip size depends on the machine architecture.
> -# Currently HAVE_KPROBES_ON_FTRACE defined on x86 and powerpc
> +# Currently HAVE_KPROBES_ON_FTRACE defined on x86 and powerpc64le
>  case `uname -m` in
>    x86_64|i[3456]86) OFFS=5;;
> -  ppc*) OFFS=4;;
> +  ppc64le) OFFS=8;;
>    *) OFFS=0;;
>  esac
>  
> -- 
> 2.13.1
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>