linux-kernel - Re: [PATCH v19 11/19] s390/tracing: Enable HAVE_FTRACE_GRAPH

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Message-ID: <20241110170524.6661-C-hca@linux.ibm.com>
Date: Sun, 10 Nov 2024 18:05:24 +0100
From: Heiko Carstens <hca@...ux.ibm.com>
To: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc: Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Florent Revest <revest@...omium.org>,
        linux-trace-kernel@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>, bpf <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
        Alan Maguire <alan.maguire@...cle.com>,
        Mark Rutland <mark.rutland@....com>, linux-arch@...r.kernel.org,
        Sven Schnelle <svens@...ux.ibm.com>
Subject: Re: [PATCH v19 11/19] s390/tracing: Enable HAVE_FTRACE_GRAPH_FUNC

On Mon, Nov 11, 2024 at 12:50:58AM +0900, Masami Hiramatsu (Google) wrote:
> From: Sven Schnelle <svens@...ux.ibm.com>
> 
> Add ftrace_graph_func() which is required for fprobe to access registers.
> This also eliminates the need for calling prepare_ftrace_return() from
> ftrace_caller().
> 
> Signed-off-by: Sven Schnelle <svens@...ux.ibm.com>
> ---
>  Changes in v19:
>   - Newly added.
> ---
>  arch/s390/Kconfig              |    1 +
>  arch/s390/include/asm/ftrace.h |    5 ++++
>  arch/s390/kernel/entry.h       |    1 -
>  arch/s390/kernel/ftrace.c      |   48 ++++++++++++----------------------------
>  arch/s390/kernel/mcount.S      |   11 ---------
>  5 files changed, 20 insertions(+), 46 deletions(-)

Acked-by: Heiko Carstens <hca@...ux.ibm.com>