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

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Message-ID: <vqw4ibum2hfnxjkfp7io5ugmwaeok4tynchi3utmzp6xnsmjig@fbjxwmm6u6v3>
Date: Wed, 22 May 2024 12:59:46 +0200
From: Alejandro Colomar <alx@...nel.org>
To: Jiri Olsa <olsajiri@...il.com>
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 Jirka,

On Wed, May 22, 2024 at 09:54:58AM GMT, Jiri Olsa wrote:
> ok, thanks
> 
> jirka
> 
> 
> ---
> diff --git a/man/man2/uretprobe.2 b/man/man2/uretprobe.2
> new file mode 100644
> index 000000000000..5b5f340b59b6
> --- /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 user.

Maybe 'a user-space program'?
Anyway, LGTM.  Thanks!

	Reviewed-by: Alejandro Colomar <alx@...nel.org>

Have a lovely day!
Alex

> +.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.

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

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