linux-kernel - Re: [powerpc:next 45/53] warning: (PPC_C2K && ..) selects NOT_COHERENT_CACHE which has unmet direct dependencies (4xx || ..)

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Message-ID: <531F1E7D.5060309@windriver.com>
Date:	Tue, 11 Mar 2014 10:32:29 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Fengguang Wu <fengguang.wu@...el.com>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	<kbuild-all@...org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [powerpc:next 45/53] warning: (PPC_C2K && ..) selects NOT_COHERENT_CACHE
 which has unmet direct dependencies (4xx || ..)

On 14-03-11 12:54 AM, Fengguang Wu wrote:
> On Mon, Mar 10, 2014 at 10:49:24AM -0400, Paul Gortmaker wrote:
>> On 14-03-08 03:07 AM, kbuild test robot wrote:
>>> tree:   git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc.git next
>>> head:   c7e64b9ce04aa2e3fad7396d92b5cb92056d16ac
>>> commit: 3c8464a9b12bf83807b6e2c896d7e7b633e1cae7 [45/53] powerpc: Delete old PrPMC 280/2800 support
>>> config: make ARCH=powerpc c2k_defconfig
>>>
>>> All warnings:
>>>
>>> warning: (PPC_C2K && AMIGAONE) selects NOT_COHERENT_CACHE which has unmet direct dependencies (4xx || 8xx || E200 || PPC_MPC512x || GAMECUBE_COMMON)
>>
>> This _looks_ like a new warning, but it really is not.  If you look
>> at the tree prior to the above named commit, it generates this:
>>
>> $ make c2k_defconfig
>> warning: (PPC_PRPMC2800 && PPC_C2K && AMIGAONE) selects NOT_COHERENT_CACHE which has unmet direct dependencies (4xx || 8xx || E200 || PPC_MPC512x || GAMECUBE_COMMON)
>> warning: (PPC_PRPMC2800 && PPC_C2K && AMIGAONE) selects NOT_COHERENT_CACHE which has unmet direct dependencies (4xx || 8xx || E200 || PPC_MPC512x || GAMECUBE_COMMON)
>> #
>> # configuration written to .config
>>
>> So the warning is slightly different in text, but essentially
>> the exact same thing that was being warned about before.  We've
>> just removed one of the possible symbols from existence.
> 
> Yes, sorry, the kbuild robot is not smart enough to detect such
> slightly changed error/warnings and will treat them as new ones.

No apology required.  I think we all appreciate the build test
coverage, and I saw your mail where you said you sent out ~60
reports yesterday- wow!

Thanks,
Paul.
--

> 
>> I'm not sure there would ever be a way to teach kbuild robot
>> about something as subtle as the above; just one of the false
>> positives that we'll have to live with, probably.
> 
> It is false positive: "this bug is not introduced by me!"
> 
> However if you take a broader view, it's still notifying the possibly
> "relevant" people who may know the background about that bug, or whom
> to further CC the report. :)
> 
> Thanks,
> Fengguang
> 
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