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

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Message-ID: <Zk3cdJKGbzwbda2e@krava>
Date: Wed, 22 May 2024 13:52:20 +0200
From: Jiri Olsa <olsajiri@...il.com>
To: Alejandro Colomar <alx@...nel.org>
Cc: Jiri Olsa <olsajiri@...il.com>, 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

On Wed, May 22, 2024 at 12:59:46PM +0200, Alejandro Colomar wrote:
> 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>

ok, will change, thanks a lot

jirka

> 
> 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/>