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

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Message-ID: <3pc746tolavkbac4n62ku5h4qqkbcinvttvcnkib6nxvzzfzym@k6vozf6totdw>
Date: Tue, 11 Jun 2024 16:49:24 +0200
From: Alejandro Colomar <alx@...nel.org>
To: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Jiri Olsa <jolsa@...nel.org>, 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>, 
	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

Hi,

On Tue, Jun 11, 2024 at 11:30:22PM GMT, Masami Hiramatsu wrote:
> 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.

Yup; please ping me when the rest is merged and I should pick it.

Have a lovely day!
Alex

> 
> 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>
> 

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

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