linux-kernel - Re: linux-next: build failure after merge of the origin tree

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Message-ID: <5074B8B5.3010307@jp.fujitsu.com>
Date:	Wed, 10 Oct 2012 08:52:21 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	<linux-next@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	ppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: linux-next: build failure after merge of the origin tree

Hi Stephen,

2012/10/10 8:45, Andrew Morton wrote:
> On Wed, 10 Oct 2012 10:21:50 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
>> Hi Linus,
>>
>> In Linus' tree, today's linux-next build (powerpc ppc64_defconfig) failed
>> like this:
>>
>> arch/powerpc/platforms/pseries/hotplug-memory.c: In function 'pseries_remove_memblock':
>> arch/powerpc/platforms/pseries/hotplug-memory.c:103:17: error: unused variable 'pfn' [-Werror=unused-variable]
>>
>> Caused by commit d760afd4d257 ("memory-hotplug: suppress "Trying to free
>> nonexistent resource <XXXXXXXXXXXXXXXX-YYYYYYYYYYYYYYYY>" warning").
>>
>> I can't see what the point of the "pfn" variable is
>
> This:
>
> --- a/arch/powerpc/platforms/pseries/hotplug-memory.c~a
> +++ a/arch/powerpc/platforms/pseries/hotplug-memory.c
> @@ -101,7 +101,7 @@ static int pseries_remove_memblock(unsig
>   	sections_to_remove = (memblock_size >> PAGE_SHIFT) / PAGES_PER_SECTION;
>   	for (i = 0; i < sections_to_remove; i++) {
>   		unsigned long pfn = start_pfn + i * PAGES_PER_SECTION;
> -		ret = __remove_pages(zone, start_pfn,  PAGES_PER_SECTION);
> +		ret = __remove_pages(zone, pfn, PAGES_PER_SECTION);
>   		if (ret)
>   			return ret;
>   	}

I believe the error to be fixed with this patch.
Could you try it?

Thanks,
Yasuaki Ishimatsu

>
>> and this patch never
>> appeared in linux-next before being merged.  :-(
>
> It was first sighted October 3.
>
>> I have reverted that commit for today.
>>
>> If this patch truly was authored yesterday (according the Author Date in
>> git), why was it merged yesterday while still under discussion?  And the
>> latest update to it still has this build problem ... did anyone even try
>> to build this for powerpc (since that architecture was obviously
>> affected)?
>
> Apparently not - the ppc bit was a best-effort fixup for a patch which
> addresses an x86 problem.
>


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