linux-kernel - Re: [PATCHv8 9/9] man2: Add uretprobe syscall page

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Message-Id: <20240611233022.82e8abfa2ff0e43fd36798b2@kernel.org>
Date: Tue, 11 Jun 2024 23:30:22 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Jiri Olsa <jolsa@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>, Oleg Nesterov <oleg@...hat.com>,
 Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
 <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, Alejandro
 Colomar <alx@...nel.org>, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, linux-api@...r.kernel.org,
 linux-man@...r.kernel.org, x86@...nel.org, bpf@...r.kernel.org, Song Liu
 <songliubraving@...com>, Yonghong Song <yhs@...com>, John Fastabend
 <john.fastabend@...il.com>, Peter Zijlstra <peterz@...radead.org>, Thomas
 Gleixner <tglx@...utronix.de>, "Borislav Petkov (AMD)" <bp@...en8.de>, Ingo
 Molnar <mingo@...hat.com>, Andy Lutomirski <luto@...nel.org>,
 "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>, Deepak Gupta
 <debug@...osinc.com>
Subject: Re: [PATCHv8 9/9] man2: Add uretprobe syscall page

On Tue, 11 Jun 2024 13:21:58 +0200
Jiri Olsa <jolsa@...nel.org> wrote:

> Adding man page for new uretprobe syscall.
> 
> Acked-by: Andrii Nakryiko <andrii@...nel.org>
> Reviewed-by: Alejandro Colomar <alx@...nel.org>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>

This looks good to me.

Reviewed-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>

And this needs to be picked by linux-man@ project.

Thank you,

> ---
>  man/man2/uretprobe.2 | 56 ++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 56 insertions(+)
>  create mode 100644 man/man2/uretprobe.2
> 
> diff --git a/man/man2/uretprobe.2 b/man/man2/uretprobe.2
> new file mode 100644
> index 000000000000..cf1c2b0d852e
> --- /dev/null
> +++ b/man/man2/uretprobe.2
> @@ -0,0 +1,56 @@
> +.\" Copyright (C) 2024, Jiri Olsa <jolsa@...nel.org>
> +.\"
> +.\" SPDX-License-Identifier: Linux-man-pages-copyleft
> +.\"
> +.TH uretprobe 2 (date) "Linux man-pages (unreleased)"
> +.SH NAME
> +uretprobe \- execute pending return uprobes
> +.SH SYNOPSIS
> +.nf
> +.B int uretprobe(void)
> +.fi
> +.SH DESCRIPTION
> +The
> +.BR uretprobe ()
> +system call is an alternative to breakpoint instructions for triggering return
> +uprobe consumers.
> +.P
> +Calls to
> +.BR uretprobe ()
> +system call are only made from the user-space trampoline provided by the kernel.
> +Calls from any other place result in a
> +.BR SIGILL .
> +.SH RETURN VALUE
> +The
> +.BR uretprobe ()
> +system call return value is architecture-specific.
> +.SH ERRORS
> +.TP
> +.B SIGILL
> +The
> +.BR uretprobe ()
> +system call was called by a user-space program.
> +.SH VERSIONS
> +Details of the
> +.BR uretprobe ()
> +system call behavior vary across systems.
> +.SH STANDARDS
> +None.
> +.SH HISTORY
> +TBD
> +.SH NOTES
> +The
> +.BR uretprobe ()
> +system call was initially introduced for the x86_64 architecture
> +where it was shown to be faster than breakpoint traps.
> +It might be extended to other architectures.
> +.P
> +The
> +.BR uretprobe ()
> +system call exists only to allow the invocation of return uprobe consumers.
> +It should
> +.B never
> +be called directly.
> +Details of the arguments (if any) passed to
> +.BR uretprobe ()
> +and the return value are architecture-specific.
> -- 
> 2.45.1
> 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>