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Message-ID: <57208010.7030505@suse.cz>
Date:	Wed, 27 Apr 2016 11:02:08 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Nicolas Pitre <nicolas.pitre@...aro.org>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jens Axboe <axboe@...nel.dk>,
	Randy Dunlap <rdunlap@...radead.org>
Subject: Re: linux-next: build failure after merge of the block tree

On 2016-04-26 22:48, Nicolas Pitre wrote:
> On Wed, 27 Apr 2016, Stephen Rothwell wrote:
> 
>> Hi Nicolas,
>>
>> On Tue, 26 Apr 2016 10:40:57 -0400 (EDT) Nicolas Pitre <nicolas.pitre@...aro.org> wrote:
>>>
>>> If you can reproduce this build failure, could you try a make mrproper 
>>> and attempt it again?  I, too, would like to find an explanation and a 
>>> way to reproduce.
>>
>> I reset my build tree to commit 9d67df654092 ("Merge remote-tracking
>> branch 'block/for-next'") and the build failed with:
>>
>> ERROR: ".local_clock" [drivers/vhost/vhost_net.ko] undefined!
>> ERROR: ".local_clock" [drivers/misc/cxl/cxl.ko] undefined!
>>
>> :-(
>>
>> So I did a "make mrproper" and did the build again.
>>
>> That built correctly.
>>
> [...]
> 
> OK!  After digging and diffing through 750 megabytes of make debug logs 
> I finally found the explanation.  The if_changed directive is useless 
> against phony targets.
> 
> @Stephen: could you replace the revert with the patch below in your tree?
> 
> @Michal: could you fold the patch below into commit 2441e78b19 in your tree?

I prefer not to overwrite the topic branches unless necessary and I
wanted to credit Stephen, so I committed your patch with a fabricated
commit message and your signoff (since you wanted to fold it into a
patch that you had already signed off).

Michal

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