linux-kernel - Re: [PATCH] vfio dma_map/unmap: optimized for hugetlbfs pages

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Date:   Tue, 21 Jul 2020 07:38:02 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jay Zhou <jianjay.zhou@...wei.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     kbuild-all@...ts.01.org, alex.williamson@...hat.com,
        cohuck@...hat.com, maoming.maoming@...wei.com,
        jianjay.zhou@...wei.com, weidong.huang@...wei.com
Subject: Re: [PATCH] vfio dma_map/unmap: optimized for hugetlbfs pages

Hi Jay,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on vfio/next]
[also build test ERROR on linux/master linus/master v5.8-rc6 next-20200720]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Jay-Zhou/vfio-dma_map-unmap-optimized-for-hugetlbfs-pages/20200720-163157
base:   https://github.com/awilliam/linux-vfio.git next
config: arm-allyesconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All error/warnings (new ones prefixed by >>):

>> drivers/vfio/vfio_iommu_type1.c:522:52: error: 'HUGE_MAX_HSTATE' undeclared here (not in a function)
     522 | struct vfio_hupetlbpage_info vfio_hugetlbpage_info[HUGE_MAX_HSTATE] = {
         |                                                    ^~~~~~~~~~~~~~~
   In file included from include/linux/mm.h:679,
                    from include/linux/scatterlist.h:8,
                    from include/linux/iommu.h:10,
                    from drivers/vfio/vfio_iommu_type1.c:27:
   include/linux/huge_mm.h:319:25: error: braced-group within expression allowed only inside a function
     319 | #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
         |                         ^
   drivers/vfio/vfio_iommu_type1.c:523:45: note: in expansion of macro 'HPAGE_PMD_SHIFT'
     523 |  {vfio_hugetlbpage_2M, PMD_SIZE, ~((1ULL << HPAGE_PMD_SHIFT) - 1)},
         |                                             ^~~~~~~~~~~~~~~
   include/linux/huge_mm.h:323:25: error: braced-group within expression allowed only inside a function
     323 | #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
         |                         ^
   drivers/vfio/vfio_iommu_type1.c:524:45: note: in expansion of macro 'HPAGE_PUD_SHIFT'
     524 |  {vfio_hugetlbpage_1G, PUD_SIZE, ~((1ULL << HPAGE_PUD_SHIFT) - 1)},
         |                                             ^~~~~~~~~~~~~~~
   drivers/vfio/vfio_iommu_type1.c: In function 'hugetlb_is_last_page':
>> drivers/vfio/vfio_iommu_type1.c:554:81: warning: parameter 'type' set but not used [-Wunused-but-set-parameter]
     554 | static bool hugetlb_is_last_page(unsigned long addr, enum vfio_hugetlbpage_type type)
         |                                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~

vim +/HUGE_MAX_HSTATE +522 drivers/vfio/vfio_iommu_type1.c

   521	
 > 522	struct vfio_hupetlbpage_info vfio_hugetlbpage_info[HUGE_MAX_HSTATE] = {
   523		{vfio_hugetlbpage_2M, PMD_SIZE, ~((1ULL << HPAGE_PMD_SHIFT) - 1)},
   524		{vfio_hugetlbpage_1G, PUD_SIZE, ~((1ULL << HPAGE_PUD_SHIFT) - 1)},
   525	};
   526	
   527	static bool is_hugetlbpage(unsigned long pfn, enum vfio_hugetlbpage_type *type)
   528	{
   529		struct page *page = NULL;
   530	
   531		if (!pfn_valid(pfn) || !type)
   532			return false;
   533	
   534		page = pfn_to_page(pfn);
   535		/* only check for hugetlbfs pages */
   536		if (!page || !PageHuge(page))
   537			return false;
   538	
   539		switch (compound_order(compound_head(page))) {
   540		case PMD_ORDER:
   541			*type = vfio_hugetlbpage_2M;
   542			break;
   543		case PUD_ORDER:
   544			*type = vfio_hugetlbpage_1G;
   545			break;
   546		default:
   547			return false;
   548		}
   549	
   550		return true;
   551	}
   552	
   553	/* Is the addr in the last page in hugetlbfs pages? */
 > 554	static bool hugetlb_is_last_page(unsigned long addr, enum vfio_hugetlbpage_type type)
   555	{
   556		unsigned int num = 0;
   557	
   558		num = hugetlb_get_resdual_pages(addr & ~(PAGE_SIZE - 1), type);
   559	
   560		if (num == 1)
   561			return true;
   562		else
   563			return false;
   564	}
   565	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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