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Date: Mon, 11 Apr 2016 11:34:01 +0530
From: Anshuman Khandual <khandual@linux.vnet.ibm.com>
MIME-Version: 1.0
To: kbuild test robot <lkp@intel.com>
CC: dave.hansen@intel.com, mgorman@techsingularity.net, hughd@google.com,
 linux-kernel@vger.kernel.org, linux-mm@kvack.org, kbuild-all@01.org,
 kirill@shutemov.name, n-horiguchi@ah.jp.nec.com,
 linuxppc-dev@lists.ozlabs.org, akpm@linux-foundation.org,
 aneesh.kumar@linux.vnet.ibm.com
Subject: Re: [PATCH 03/10] mm/hugetlb: Protect follow_huge_(pud|pgd) functions
 from race
References: <201604071708.osnfXWQP%fengguang.wu@intel.com>
In-Reply-To: <201604071708.osnfXWQP%fengguang.wu@intel.com>
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On 04/07/2016 03:04 PM, kbuild test robot wrote:
> All errors (new ones prefixed by >>):
> 
>    mm/hugetlb.c: In function 'follow_huge_pud':
>>> >> mm/hugetlb.c:4360:3: error: implicit declaration of function 'pud_page' [-Werror=implicit-function-declaration]
>       page = pud_page(*pud) + ((address & ~PUD_MASK) >> PAGE_SHIFT);
>       ^
>    mm/hugetlb.c:4360:8: warning: assignment makes pointer from integer without a cast
>       page = pud_page(*pud) + ((address & ~PUD_MASK) >> PAGE_SHIFT);
>            ^
>    mm/hugetlb.c: In function 'follow_huge_pgd':
>    mm/hugetlb.c:4395:3: error: implicit declaration of function 'pgd_page' [-Werror=implicit-function-declaration]
>       page = pgd_page(*pgd) + ((address & ~PGDIR_MASK) >> PAGE_SHIFT);

Both the build errors here are because of the fact that pgd_page() is
not available for some platforms and config options. It got missed as
I ran only powerpc config options for build test purpose. My bad, will
fix it.