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

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Date:	Wed, 21 Mar 2012 16:26:09 -0700
From:	David Daney <ddaney.cavm@...il.com>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	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 03/21/2012 03:36 PM, Paul Gortmaker wrote:
> 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
>

This is just another instance of:

https://lkml.org/lkml/2011/12/16/507

There was some discussion in that thread of how it might be fixed.

David Daney


> Build was for ARM, tct_hammer_defconfig
>
> Paul.
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