From: Will Deacon <will@kernel.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
linux-arm-kernel@lists.infradead.org,
"Masami Hiramatsu (Google)" <mhiramat@kernel.org>,
Florent Revest <revest@chromium.org>,
linux-trace-kernel@vger.kernel.org,
LKML <linux-kernel@vger.kernel.org>,
Alexei Starovoitov <ast@kernel.org>, Jiri Olsa <jolsa@kernel.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Mark Rutland <mark.rutland@arm.com>
Subject: Re: [PATCH v14 04/19] function_graph: Replace fgraph_ret_regs with ftrace_regs
Date: Tue, 17 Sep 2024 10:55:39 +0100 [thread overview]
Message-ID: <20240917095538.GA27384@willie-the-truck> (raw)
In-Reply-To: <20240915051144.445681c2@rorschach.local.home>
On Sun, Sep 15, 2024 at 05:11:44AM -0400, Steven Rostedt wrote:
> On Fri, 13 Sep 2024 00:08:51 +0900
> "Masami Hiramatsu (Google)" <mhiramat@kernel.org> wrote:
>
> > From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
> >
> > Use ftrace_regs instead of fgraph_ret_regs for tracing return value
> > on function_graph tracer because of simplifying the callback interface.
> >
> > The CONFIG_HAVE_FUNCTION_GRAPH_RETVAL is also replaced by
> > CONFIG_HAVE_FUNCTION_GRAPH_FREGS.
> >
> > Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
> > ---
> > Changes in v8:
> > - Newly added.
> > ---
> > arch/arm64/Kconfig | 1 +
> > arch/arm64/include/asm/ftrace.h | 23 ++++++-----------------
> > arch/arm64/kernel/asm-offsets.c | 12 ------------
> > arch/arm64/kernel/entry-ftrace.S | 32 ++++++++++++++++++--------------
The arm64 part looks good to me, although passing a partially-populated
struct out of asm feels like it's going to cause us hard-to-debug
problems down the line if any of those extra fields get used. How hard
would it be to poison the unpopulated members of 'ftrace_regs'?
Will
next prev parent reply other threads:[~2024-09-17 9:57 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <172615368656.133222.2336770908714920670.stgit@devnote2>
[not found] ` <172615372005.133222.15797801841635819220.stgit@devnote2>
2024-09-15 8:46 ` [PATCH v14 03/19] function_graph: Pass ftrace_regs to entryfunc Steven Rostedt
2024-09-17 8:26 ` Will Deacon
2024-09-30 18:46 ` Steven Rostedt
2024-10-01 1:57 ` Masami Hiramatsu
[not found] ` <172615374207.133222.13117574733580053025.stgit@devnote2>
2024-09-15 8:49 ` [PATCH v14 05/19] function_graph: Pass ftrace_regs to retfunc Steven Rostedt
2024-09-17 10:08 ` Will Deacon
2024-09-30 19:03 ` Steven Rostedt
2024-10-01 23:24 ` Masami Hiramatsu
[not found] ` <172615373091.133222.1812791604518973124.stgit@devnote2>
2024-09-15 9:11 ` [PATCH v14 04/19] function_graph: Replace fgraph_ret_regs with ftrace_regs Steven Rostedt
2024-09-17 9:55 ` Will Deacon [this message]
2024-09-30 18:55 ` Steven Rostedt
2024-10-01 23:10 ` Masami Hiramatsu
2024-10-01 23:32 ` Steven Rostedt
2024-10-02 14:31 ` Masami Hiramatsu
[not found] ` <172615377576.133222.5911358383330497277.stgit@devnote2>
2024-09-15 9:22 ` [PATCH v14 08/19] tracing: Add ftrace_partial_regs() for converting ftrace_regs to pt_regs Steven Rostedt
2024-09-17 10:14 ` Will Deacon
2024-10-01 23:26 ` Masami Hiramatsu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20240917095538.GA27384@willie-the-truck \
--to=will@kernel.org \
--cc=acme@kernel.org \
--cc=ast@kernel.org \
--cc=catalin.marinas@arm.com \
--cc=daniel@iogearbox.net \
--cc=jolsa@kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-trace-kernel@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=mhiramat@kernel.org \
--cc=revest@chromium.org \
--cc=rostedt@goodmis.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox