linux-kernel - Re: [PATCH] kbuild: Don't pass -rR to selftest makefiles

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Date:	Tue, 10 Mar 2015 18:35:16 -0600
From:	Shuah Khan <shuahkh@....samsung.com>
To:	Michael Ellerman <mpe@...erman.id.au>
CC:	mmarek@...e.cz, linux-kernel@...r.kernel.org,
	davej@...emonkey.org.uk, linux-api@...r.kernel.org
Subject: Re: [PATCH] kbuild: Don't pass -rR to selftest makefiles

On 03/10/2015 05:49 PM, Michael Ellerman wrote:
> On Tue, 2015-03-10 at 17:39 -0600, Shuah Khan wrote:
>> On 03/10/2015 05:36 PM, Michael Ellerman wrote:
>>> On Mon, 2015-03-09 at 16:49 -0600, Shuah Khan wrote:
>>>> On 03/09/2015 08:28 AM, Shuah Khan wrote:
>>>>> On 03/04/2015 03:19 AM, Michael Ellerman wrote:
>>>>>> The makefiles under tools/testing/selftests are not real kbuild
>>>>>> makefiles, they are regular stand alone makefiles. As such they *do*
>>>>>> want all the standard implicit rules and variables defined.
>>>>>>
>>>>>> So before calling those makefiles, filter -rR out of MAKEFLAGS.
>>>>>>
>>>>>> Without this not all the selftests are built correctly when called via
>>>>>> the top-level Makefile.
>>>>>>
>>>>>> Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
>>>>>
>>>>> Hi Michal,
>>>>>
>>>>> Could you please take this patch in your tree.
>>>>>
>>>>> Acked-by: Shuah Khan <shuahkh@....samsung.com>
>>>>>
>>>>
>>>> I am changing this to a Nack. This is not fully cooked.
>>>> I am seeing new failures on some tests.
>>>>
>>>> gcc: error: elf_x86_64: No such file or directory
>>>> gcc: error: unrecognized command line option ‘-m’
>>>
>>> I can't reproduce that here. In what way do you think it's related to this
>>> patch?
>>
>> I have just your patch on tops of linux 4.0-rc3 and ran
>> make kselftest and that's what I see.
>>
>> If you can fix this problem I can take your patch, otherwise,
>> I have to go with individual Makefiles fixes.
> 
> OK I see it now, only happens on x86.
> 
> It looks like it's coming in via kbuild. Though I can only see it being set in
> arch/x86/Makefile.um, and I don't know why that is being sourced. But it must
> be.
> 
> So this is another symptom of running via the top-level Makefile rather than
> directly.
> 
> I'll try and find a fix.
> 

If you can fix it that is great. I don't see any need to change
existing Makefiles to delete explicit rules based on this change
though.

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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