linux-kernel - Re: [PATCHv2 1/1] Documentation: describe how to add a system call

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Date:	Thu, 30 Jul 2015 18:30:07 +0200
From:	Cyril Hrubis <chrubis@...e.cz>
To:	David Drysdale <drysdale@...gle.com>
Cc:	linux-api@...r.kernel.org,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	Shuah Khan <shuahkh@....samsung.com>,
	Jonathan Corbet <corbet@....net>,
	Eric B Munson <emunson@...mai.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Oleg Nesterov <oleg@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Al Viro <viro@...iv.linux.org.uk>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Peter Zijlstra <peterz@...radead.org>,
	Vivek Goyal <vgoyal@...hat.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	David Herrmann <dh.herrmann@...il.com>,
	Theodore Ts'o <tytso@....edu>,
	Kees Cook <keescook@...omium.org>,
	Miklos Szeredi <mszeredi@...e.cz>,
	Milosz Tanski <milosz@...in.com>, Fam Zheng <famz@...hat.com>,
	Josh Triplett <josh@...htriplett.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 1/1] Documentation: describe how to add a system call

Hi!
> +Testing
> +-------
> +
> +A new system call should obviously be tested; it is also useful to provide
> +reviewers with a demonstration of how user space programs will use the system
> +call.  A good way to combine these aims is to include a simple self-test
> +program in a new directory under tools/testing/selftests/.

I know that this is a bit off topic, but since the selftest is now the
official place to add kernel testcases to let me rant about it a bit.

It's a bit of a pain seeing people reinvent the wheel and trying to
figure out consistent test interface while most of the problems has been
solved in LTP[1] test library quite some time ago. Especially use of the
SAFE_MACROS[2] would simplify writing test setups quite a lot.

I wonder if we can at least share the test library, pulling it out of
LTP, or at least the interesting parts, wouldn't be hard at all.

[1]
https://github.com/linux-test-project/ltp/wiki/Test-Writing-Guidelines#221-basic-test-structure

[2]
https://github.com/linux-test-project/ltp/wiki/Test-Writing-Guidelines#224-safe-macros


-- 
Cyril Hrubis
chrubis@...e.cz
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