linux-kernel - Re: [PATCH] shmem: avoid huge pages for small files

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Date:   Fri, 11 Nov 2016 01:42:47 +0800
From:   kbuild test robot <lkp@...el.com>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     kbuild-all@...org, Hugh Dickins <hughd@...gle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Dave Chinner <david@...morbit.com>,
        Michal Hocko <mhocko@...nel.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] shmem: avoid huge pages for small files

Hi Kirill,

[auto build test WARNING on linus/master]
[also build test WARNING on v4.9-rc4 next-20161110]
[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/shmem-avoid-huge-pages-for-small-files/20161111-005428
config: i386-randconfig-s0-201645 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   mm/shmem.c: In function 'shmem_getpage_gfp':
>> mm/shmem.c:1680:12: warning: unused variable 'off' [-Wunused-variable]
       pgoff_t off;
               ^~~

vim +/off +1680 mm/shmem.c

66d2f4d2 Hugh Dickins       2014-07-02  1664  			mark_page_accessed(page);
66d2f4d2 Hugh Dickins       2014-07-02  1665  
54af6042 Hugh Dickins       2011-08-03  1666  		delete_from_swap_cache(page);
27ab7006 Hugh Dickins       2011-07-25  1667  		set_page_dirty(page);
27ab7006 Hugh Dickins       2011-07-25  1668  		swap_free(swap);
27ab7006 Hugh Dickins       2011-07-25  1669  
54af6042 Hugh Dickins       2011-08-03  1670  	} else {
800d8c63 Kirill A. Shutemov 2016-07-26  1671  		/* shmem_symlink() */
800d8c63 Kirill A. Shutemov 2016-07-26  1672  		if (mapping->a_ops != &shmem_aops)
800d8c63 Kirill A. Shutemov 2016-07-26  1673  			goto alloc_nohuge;
657e3038 Kirill A. Shutemov 2016-07-26  1674  		if (shmem_huge == SHMEM_HUGE_DENY || sgp_huge == SGP_NOHUGE)
800d8c63 Kirill A. Shutemov 2016-07-26  1675  			goto alloc_nohuge;
800d8c63 Kirill A. Shutemov 2016-07-26  1676  		if (shmem_huge == SHMEM_HUGE_FORCE)
800d8c63 Kirill A. Shutemov 2016-07-26  1677  			goto alloc_huge;
800d8c63 Kirill A. Shutemov 2016-07-26  1678  		switch (sbinfo->huge) {
800d8c63 Kirill A. Shutemov 2016-07-26  1679  			loff_t i_size;
800d8c63 Kirill A. Shutemov 2016-07-26 @1680  			pgoff_t off;
800d8c63 Kirill A. Shutemov 2016-07-26  1681  		case SHMEM_HUGE_NEVER:
800d8c63 Kirill A. Shutemov 2016-07-26  1682  			goto alloc_nohuge;
800d8c63 Kirill A. Shutemov 2016-07-26  1683  		case SHMEM_HUGE_WITHIN_SIZE:
bb89f249 Kirill A. Shutemov 2016-11-10  1684  			i_size = i_size_read(inode);
bb89f249 Kirill A. Shutemov 2016-11-10  1685  			if (index >= HPAGE_PMD_NR || i_size >= HPAGE_PMD_SIZE)
800d8c63 Kirill A. Shutemov 2016-07-26  1686  				goto alloc_huge;
800d8c63 Kirill A. Shutemov 2016-07-26  1687  			/* fallthrough */
800d8c63 Kirill A. Shutemov 2016-07-26  1688  		case SHMEM_HUGE_ADVISE:

:::::: The code at line 1680 was first introduced by commit
:::::: 800d8c63b2e989c2e349632d1648119bf5862f01 shmem: add huge pages support

:::::: TO: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

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