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

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Hi Kirill,

[auto build test WARNING on linus/master]
[also build test WARNING 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: x86_64-randconfig-a0-11231631 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   In file included from fs/hfsplus/super.c:12:
   include/linux/pagemap.h: In function 'page_to_pgoff':
>> include/linux/pagemap.h:402: warning: unused variable 'pgoff'

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

   386	
   387		/*
   388		 *  We don't initialize ->index for tail pages: calculate based on
   389		 *  head page
   390		 */
   391		pgoff = compound_head(page)->index;
   392		pgoff += page - compound_head(page);
   393		return pgoff;
   394	}
   395	
   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);
   406	
   407		return page_to_index(page);
   408	}
   409	
   410	/*

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

Attachment: .config.gz
Description: application/gzip


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