linux-kernel - Re: [PATCH v4 2/3] thp: add HPAGE_PMD_* definitions for !CONFIG_TRANSPARENT

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Date:	Wed, 21 Mar 2012 18:36:00 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Hillf Danton <dhillf@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<linux-next@...r.kernel.org>
Subject: Re: [PATCH v4 2/3] thp: add HPAGE_PMD_* definitions for !CONFIG_TRANSPARENT_HUGEPAGE

On 12-03-21 06:19 PM, Andrew Morton wrote:
> On Wed, 21 Mar 2012 18:07:41 -0400
> Paul Gortmaker <paul.gortmaker@...driver.com> wrote:
> 
>> On Mon, Mar 12, 2012 at 6:30 PM, Naoya Horiguchi
>> <n-horiguchi@...jp.nec.com> wrote:
>>> These macros will be used in later patch, where all usage are expected
>>> to be optimized away without #ifdef CONFIG_TRANSPARENT_HUGEPAGE.
>>> But to detect unexpected usages, we convert existing BUG() to BUILD_BUG().
>>
>> Just a heads up that this showed up in linux-next today as the
>> cause of a new build failure for an ARM board:
> 
> Dammit.
> 
>> http://kisskb.ellerman.id.au/kisskb/buildresult/5930053/
> 
> Site is dead.  What was failure, please?

Odd, I just reloaded the above link and it seems alive?
Anyway here is where it goes off the rails.

mm/pgtable-generic.c: In function 'pmdp_clear_flush_young':
mm/pgtable-generic.c:76:136: error: call to '__build_bug_failed' declared with attribute error: BUILD_BUG failed
make[2]: *** [mm/pgtable-generic.o] Error 1

Build was for ARM, tct_hammer_defconfig

Paul.
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