linux-kernel - Re: [for-next][PATCH 05/24] powerpc/frace: Use ftrace_graph_get_ret_stack() instead of curr_ret

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Date:   Sat, 22 Dec 2018 20:51:21 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [for-next][PATCH 05/24] powerpc/frace: Use ftrace_graph_get_ret_stack() instead of curr_ret_stack

Steven Rostedt <rostedt@...dmis.org> writes:

> From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
>
> The structure of the ret_stack array on the task struct is going to
> change, and accessing it directly via the curr_ret_stack index will no
> longer give the ret_stack entry that holds the return address. To access
> that, architectures must now use ftrace_graph_get_ret_stack() to get the
> associated ret_stack that matches the saved return address.
>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: linuxppc-dev@...ts.ozlabs.org
> Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> ---
>  arch/powerpc/kernel/process.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)

I did test the previous series you posted and I think everything was OK
running the ftracetest suite (I got one or two fails but I think that
was because of missing CONFIG options).

Acked-by: Michael Ellerman <mpe@...erman.id.au> (powerpc)

cheers