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

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Date:	Tue, 12 May 2015 20:34:57 -0700
From:	Darren Hart <dvhart@...radead.org>
To:	Shuah Khan <shuahkh@....samsung.com>
Cc:	Darren Hart <dvhart@...ux.intel.com>,
	Cyril Hrubis <chrubis@...e.cz>, 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 Tue, May 12, 2015 at 03:21:12PM -0600, Shuah Khan wrote:
> 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@....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.
> >>
> > 
> > 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.

Oh good - I just reviewed my patches and could swear it was all there!

I'll add the .gitignore now and roll out v4 with all the cleanups and pthread
linker fixes.

-- 
Darren Hart
Intel Open Source Technology Center
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