linux-kernel - Re: [PATCH 1/5] selftests: Add futex functional tests

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Date:	Tue, 12 May 2015 14:40:36 -0600
From:	Shuah Khan <shuahkh@....samsung.com>
To:	Darren Hart <dvhart@...ux.intel.com>,
	Cyril Hrubis <chrubis@...e.cz>
CC:	linux-api@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	John Stultz <john.stultz@...aro.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Davidlohr Bueso <dave@...olabs.net>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Shuah Khan <shuahkh@....samsung.com>
Subject: Re: [PATCH 1/5] selftests: Add futex functional tests

On 05/12/2015 02:15 PM, Darren Hart wrote:
> On 5/12/15, 1:05 PM, "Cyril Hrubis" <chrubis@...e.cz> wrote:
> 
>> Hi!
>>>>> I'm happy to do that, but I would like to make sure I'm doing the
>>> right
>>>>> thing.
>>>>
>>>> The right thing here is to add -pthread to CFLAGS which sets both flags
>>>> for preprocessor and linker (see man gcc).
>>>
>>> Hi Cyril,
>>>
>>> Thanks. I read that, and mentioned it, but my concern with -pthread in
>>> the
>>> CFLAGS and LDFLAGS is that it is a non-standard compiler flag. I
>>> understand we have a number of gcc-isms in our build - but do we want to
>>> add more?
>>>
>>> I'm also struggling to find any kind of prescribed documentation on this
>>> beyond the short blurb in the gcc man page which describes what this
>>> option does, but not when to use it. I'll need something concrete to
>>> justify changes to testcase Makefiles to Shuah.
>>
>> Sorry to mislead you with the pointing at gcc man page.
>>
>> It is a Linux standard. Have a look at pthreads manual page:
>> http://man7.org/linux/man-pages/man7/pthreads.7.html
>>
>> "On Linux, programs that use the Pthreads API should be compiled using
>> cc -pthread."
>>
>> Or any pthread_foo() manual page that starts with:
>>
>> "Compile and link with -pthread."
>>
>> The portable way i.e. POSIX would be getting compiler flags with getconf
>> but as this is a Linux kernel testsuite I would not bother with that.
>> Hmm, and it looks like this is not implemented on Linux anyway.
> 
> Thanks Cyril, that's perfect.
> 
> I'll roll my latest example patch adding -pthread to LDFLAGS and CFLAGS
> into the initial patch and resubmit the patch series as v4.
> 

Daren,

While you are generating new version, could you also please add
.gitignore for the futex binaries, so they get ignored by git.

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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