Re: [PATCH] mm: fix false-positive WARN_ON() in truncate/invalidate for hugetlb

[kbuild test robot <lkp@intel.com>]

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Hi Kirill,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.9-rc6 next-20161123]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Kirill-A-Shutemov/mm-fix-false-positive-WARN_ON-in-truncate-invalidate-for-hugetlb/20161123-185641
config: alpha-defconfig (attached as .config)
compiler: alpha-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=alpha 

All errors (new ones prefixed by >>):

   In file included from arch/alpha/mm/init.c:9:0:
   include/linux/pagemap.h: In function 'page_to_pgoff':
>> include/linux/pagemap.h:402:10: error: unused variable 'pgoff' [-Werror=unused-variable]
     pgoff_t pgoff;
             ^~~~~
   cc1: all warnings being treated as errors

vim +/pgoff +402 include/linux/pagemap.h

   396	/*
   397	 * Get the offset in PAGE_SIZE.
   398	 * (TODO: hugepage should have ->index in PAGE_SIZE)
   399	 */
   400	static inline pgoff_t page_to_pgoff(struct page *page)
   401	{
 > 402		pgoff_t pgoff;
   403	
   404		if (unlikely(PageHeadHuge(page)))
   405			return page->index << compound_order(page);

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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