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

Masami Hiramatsu
2024-06-11T14:30:29Z

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

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

This looks good to me.

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