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

From: Shuah Khan
Date: Tue May 12 2015 - 17:21:24 EST

On 05/12/2015 03:17 PM, Shuah Khan wrote:
> On 05/12/2015 02:54 PM, Darren Hart wrote:
>> On 5/12/15, 1:40 PM, "Shuah Khan" <shuahkh@xxxxxxxxxxxxxxx> wrote:
>>> On 05/12/2015 02:15 PM, Darren Hart wrote:
>>>> On 5/12/15, 1:05 PM, "Cyril Hrubis" <chrubis@xxxxxxx> 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:
>>>>> "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.
> Daren,
> Do you plan to add futex test install support in a later patch
> series? When you sent this patch series, install support was
> work in progress. 4.1 has the kselftest install feature.
> Feel free to defer it for a later patch series if you like. Would
> be good to get the futex install support into 4.2 if it is possible.

I am blind. Never mind. futex tests are installed.

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