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 09:34:16 -0700
From:	Shuah Khan <shuahkh@....samsung.com>
To:	Michael Ellerman <mpe@...erman.id.au>
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 01/18/2015 05:35 PM, Michael Ellerman wrote:
> 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.
> 

I want to keep the kselftest installs to default to the location
other kernel installs such as firmware and modules default to.
This keep the use-case the same as other kernel installs. As user
can override the location, I don't any problems with this.

For most kernel developers, INSTALL_MOD_PATH is the familiar place
to cleanup kernels and I don't see any reason to change that.

You are welcome to send patches to simply the install process for
the individual tests for the next release. I want individual patches
for each test and a separate patch for the shared logic patch.

thanks,
-- Shuah


-- 
Shuah Khan
Sr. Linux Kernel Developer
Open Source Innovation Group
Samsung Research America (Silicon Valley)
shuahkh@....samsung.com | (970) 217-8978
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