linux-kernel - Re: [PATCHv6 9/9] man2: Add uretprobe syscall page

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Date: Tue, 21 May 2024 13:36:25 +0200
From: Alejandro Colomar <alx@...nel.org>
To: Jiri Olsa <jolsa@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>, 
	Masami Hiramatsu <mhiramat@...nel.org>, Oleg Nesterov <oleg@...hat.com>, 
	Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Andrii Nakryiko <andrii@...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: [PATCHv6 9/9] man2: Add uretprobe syscall page

Hi Jiri,

On Tue, May 21, 2024 at 12:48:25PM GMT, Jiri Olsa wrote:
> Adding man page for new uretprobe syscall.
> 
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  man2/uretprobe.2 | 50 ++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 50 insertions(+)
>  create mode 100644 man2/uretprobe.2
> 
> diff --git a/man2/uretprobe.2 b/man2/uretprobe.2
> new file mode 100644
> index 000000000000..690fe3b1a44f
> --- /dev/null
> +++ b/man2/uretprobe.2
> @@ -0,0 +1,50 @@
> +.\" 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

What header file provides this system call?

> +.SH DESCRIPTION
> +The
> +.BR uretprobe ()
> +syscall is an alternative to breakpoint instructions for
> +triggering return uprobe consumers.
> +.P
> +Calls to
> +.BR uretprobe ()
> +suscall are only made from the user-space trampoline provided by the kernel.

s/suscall/system call/

> +Calls from any other place result in a
> +.BR SIGILL .

Maybe add an ERRORS section?

> +

We don't use blank lines; it causes a groff(1) warning, and other
problems.  Instead, use '.P'.

> +.SH RETURN VALUE
> +The
> +.BR uretprobe ()
> +syscall return value is architecture-specific.
> +

.P

> +.SH VERSIONS
> +This syscall is not specified in POSIX,

Redundant with "STANDARDS: None.".

> +and details of its behavior vary across systems.

Keep this.

> +.SH STANDARDS
> +None.
> +.SH HISTORY
> +TBD
> +.SH NOTES
> +The
> +.BR uretprobe ()
> +syscall 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.

Please use semantic newlines.

$ MANWIDTH=72 man man-pages | sed -n '/Use semantic newlines/,/^$/p'
   Use semantic newlines
     In the source of a manual page, new sentences should be started on
     new lines, long sentences should be split  into  lines  at  clause
     breaks  (commas,  semicolons, colons, and so on), and long clauses
     should be split at phrase boundaries.  This convention,  sometimes
     known as "semantic newlines", makes it easier to see the effect of
     patches, which often operate at the level of individual sentences,
     clauses, or phrases.

> +.P
> +The
> +.BR uretprobe ()
> +syscall exists only to allow the invocation of return uprobe consumers.

s/syscall/system call/

> +It should
> +.B never
> +be called directly.
> +Details of the arguments (if any) passed to
> +.BR uretprobe ()
> +and the return value are architecture-specific.
> -- 
> 2.44.0

Have a lovely day!
Alex

-- 
<https://www.alejandro-colomar.es/>

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