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

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Date:	Tue, 12 May 2015 13:54:32 -0700
From:	Darren Hart <dvhart@...ux.intel.com>
To:	Shuah Khan <shuahkh@....samsung.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>
Subject: Re: [PATCH 1/5] selftests: Add futex functional tests

On 5/12/15, 1:40 PM, "Shuah Khan" <shuahkh@....samsung.com> wrote:

>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.

Will do.

-- 
Darren Hart
Intel Open Source Technology Center



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