netdev - Re: [PATCH 4/6] kbuild: add a new kselftest_install make target to install selftests

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Date:	Mon, 19 Jan 2015 11:35:47 +1100
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Shuah Khan <shuahkh@....samsung.com>
Cc:	linux-kernel@...r.kernel.org, mmarek@...e.cz,
	gregkh@...uxfoundation.org, akpm@...ux-foundation.org,
	rostedt@...dmis.org, mingo@...hat.com, davem@...emloft.net,
	keescook@...omium.org, tranmanphong@...il.com, cov@...eaurora.org,
	dh.herrmann@...il.com, hughd@...gle.com, bobby.prani@...il.com,
	serge.hallyn@...ntu.com, ebiederm@...ssion.com,
	tim.bird@...ymobile.com, josh@...htriplett.org, koct9i@...il.com,
	linux-kbuild@...r.kernel.org, linux-api@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 4/6] kbuild: add a new kselftest_install make target to
 install selftests

On Fri, 2015-01-16 at 09:34 -0700, Shuah Khan wrote:
> On 01/09/2015 02:06 AM, Michael Ellerman wrote:
> > Add a new make target to install kernel selftests. This new target will
> > build and install selftests.
> > 
> > The default is just $(objtree)/selftests. This is preferable to
> > something based on $(INSTALL_MOD_PATH) (which defaults to /), as it
> > allows a normal user to install the tests. This is similar to the
> > default behaviour of make headers_install.
> 
> A normal user can install tests at any location they choose by
> overriding the default path. For example:
> 
> INSTALL_MOD_PATH=/tmp make kselftest_install
> 
> will install under tmp.

Why default to a directory that most users can't write to? That's not helpful.

Users who are root can override the path, for example:

INSTALL_MOD_PATH=/ make kselftest_install

> The approach I used also ties test installs to kernel release.
> This addresses an important use-case for kernel developers
> that want to compare results from release to release.

Sure, I'm happy to add the kernel release, so the default would be
$(objtree)/selftests/$(kernel-release)/.

> The use-case for any user to be able to install tests at
> any location is addressed by the above example.

The default should work for most users most of the time, / does not achieve
that.

> I would like these two above use-cases continued to be supported,
> especially the one that tries the test installs to kernel release.

That's fine, I'm happy to update this to use kernel release. But defaulting to
/ doesn't make sense.

> Another goal is to keep changes to the main Makefile minimal and
> the rest of the install support belongs under selftests/Makefile
> and any other include file (like the one you proposed).

Yes, this patch does just that.

cheers


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