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Date:	Mon, 05 Jan 2015 14:28:53 -0700
From:	Shuah Khan <shuahkh@....samsung.com>
To:	Tim Bird <tim.bird@...ymobile.com>,
	"mmarek@...e.cz" <mmarek@...e.cz>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"rostedt@...dmis.org" <rostedt@...dmis.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"keescook@...omium.org" <keescook@...omium.org>,
	"tranmanphong@...il.com" <tranmanphong@...il.com>,
	"mpe@...erman.id.au" <mpe@...erman.id.au>,
	"cov@...eaurora.org" <cov@...eaurora.org>,
	"dh.herrmann@...il.com" <dh.herrmann@...il.com>,
	"hughd@...gle.com" <hughd@...gle.com>,
	"bobby.prani@...il.com" <bobby.prani@...il.com>,
	"serge.hallyn@...ntu.com" <serge.hallyn@...ntu.com>,
	"ebiederm@...ssion.com" <ebiederm@...ssion.com>,
	"josh@...htriplett.org" <josh@...htriplett.org>,
	"koct9i@...il.com" <koct9i@...il.com>
CC:	"linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Shuah Khan <shuahkh@....samsung.com>
Subject: Re: WIP alternative - was Re: [PATCH v3 14/20] selftests/size: add
 install target to enable test install

On 12/31/2014 07:31 PM, Tim Bird wrote:
> On 12/24/2014 08:27 AM, Shuah Khan wrote:
>> Add a new make target to enable installing test. This target
>> installs test in the kselftest install location and add to the
>> kselftest script to run the test. Install target can be run
>> only from top level kernel source directory.
>>
>> Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
>> ---
>>  tools/testing/selftests/size/Makefile | 12 +++++++++++-
>>  1 file changed, 11 insertions(+), 1 deletion(-)
>>
>> diff --git a/tools/testing/selftests/size/Makefile b/tools/testing/selftests/size/Makefile
>> index 04dc25e..bb7113b 100644
>> --- a/tools/testing/selftests/size/Makefile
>> +++ b/tools/testing/selftests/size/Makefile
>> @@ -1,12 +1,22 @@
>>  CC = $(CROSS_COMPILE)gcc
>>  
>> +TEST_STR = ./get_size || echo get_size selftests: [FAIL]
>> +
>>  all: get_size
>>  
>>  get_size: get_size.c
>>  	$(CC) -static -ffreestanding -nostartfiles -s $< -o $@
>>  
>> +install:
>> +ifdef INSTALL_KSFT_PATH
>> +	install ./get_size $(INSTALL_KSFT_PATH)
>> +	@echo "$(TEST_STR)" >> $(KSELFTEST)
>> +else
>> +	@echo Run make kselftest_install in top level source directory
>> +endif
>> +
>>  run_tests: all
>> -	./get_size
>> +	@$(TEST_STR)
>>  
>>  clean:
>>  	$(RM) get_size
>>
> 
> The install phase is desperately needed for usage of kselftest in
> cross-target situations (applicable to almost all embedded).  So this
> is great stuff.

Thanks.

> 
> I worked a bit on isolating the install stuff to a makefile include file.
> This allows simplifying some of the sub-level Makefiles a bit, and allowing
> control of some of the install and run logic in less places.
> 
> This is still a work in progress, but before I got too far along, I wanted
> to post it for people to provide feedback.  A couple of problems cropped
> up that are worth discussing, IMHO.
> 
> 1) I think it should be a requirement that each test has a single
> "main" program to execute to run the tests.  If multiple tests are supported
> or more flexibility is desired for additional arguments, or that sort of
> thing, then that's fine, but the automated script builder should be able
> to run just a single program or script to have things work.  This also
> makes things more consistent.  In the case of the firmware test, I created
> a single fw_both.sh script to do this, instead of having two separate
> blocks in the kselftest.sh script.

It is a good goal for individual tests to use a main program to run
tests, even though, I would not make it a requirement. I would like to
leave that decision up to the individual test writer.

> 
> 2) I've added a CROSS_INSTALL variable, which can call an arbitrary program
> to place files on the target system (rather than just calling 'install').
> In my case, I'd use my own 'ttc cp' command, which I can extend as necessary
> to put things on a remote machine.  This works for a single directory,
> but things get dicier with sub-directory trees full of files (like
> the ftrace test uses.)
> 
> If additional items need to be installed to the target, then maybe a setup
> program should be used, rather than just copying files.
> 
> 3) Some of the scripts were using /bin/bash to execute them, rather
> than rely on the interpreter line in the script itself (and having
> the script have executable privileges).  Is there a reason for this?
> I modified a few scripts to be executable, and got rid of the
> explicit execution with /bin/bash.

Probably no reason other than the choice made by the test writer.
It could be cleaned up and made consistent, however, I would see
this as a separate enhancement type work that could be done on its
own and not include it in the install work.

> 
> The following is just a start...  Let me know if this direction looks
> OK, and I'll finish this up.  The main item to look at is
> kselftest.include file.  Note that these patches are based on Shuah's
> series - but if you want to use these ideas I can rebase them onto
> mainline, and break them out per test sub-level like Shuah did.

One of the reasons I picked install target approach is to enable the
feature by extending the existing run_tests support. This way we will
have the feature available quickly. Once that is supported, we can work
on evolving to a generic approach to use the include file approach, as
the changes you are proposing are based on the the series I sent out,
and makes improvements to it.

kselftest.include file approach could work for several tests and tests
that can't use the generic could add their own install support.

I propose evolving to a generic kselftest.include as the second step in
evolving the install feature. Can I count on you do the work and update
the tests to use kselftest.include, CROSS_INSTALL variable support?

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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