Re: [RFC] vfio/type1: optimize vfio_unpin_pages_remote() for large folio

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

Hi,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on awilliam-vfio/next]
[also build test ERROR on awilliam-vfio/for-linus linus/master v6.15 next-20250605]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/lizhe-67-bytedance-com/vfio-type1-optimize-vfio_unpin_pages_remote-for-large-folio/20250605-205109
base:   https://github.com/awilliam/linux-vfio.git next
patch link:    https://lore.kernel.org/r/20250605124923.21896-1-lizhe.67%40bytedance.com
patch subject: [RFC] vfio/type1: optimize vfio_unpin_pages_remote() for large folio
config: s390-randconfig-002-20250606 (https://download.01.org/0day-ci/archive/20250606/202506060749.d93rQNLD-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250606/202506060749.d93rQNLD-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202506060749.d93rQNLD-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/vfio/vfio_iommu_type1.c:778:14: error: call to undeclared function 'vpfn_pages'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     778 |                         locked += vpfn_pages(dma, iova, step);
         |                                   ^
   drivers/vfio/vfio_iommu_type1.c:778:14: note: did you mean 'vma_pages'?
   include/linux/mm.h:3590:29: note: 'vma_pages' declared here
    3590 | static inline unsigned long vma_pages(struct vm_area_struct *vma)
         |                             ^
   1 error generated.


vim +/vpfn_pages +778 drivers/vfio/vfio_iommu_type1.c

   761	
   762	static long vfio_unpin_pages_remote(struct vfio_dma *dma, dma_addr_t iova,
   763					    unsigned long pfn, unsigned long npage,
   764					    bool do_accounting)
   765	{
   766		long unlocked = 0, locked = 0;
   767	
   768		while (npage) {
   769			long step = get_step(pfn, npage);
   770	
   771			/*
   772			 * Although the third parameter of put_pfns() is of type int,
   773			 * the value of step here will not exceed the range that int
   774			 * can represent. Therefore, it is safe to pass step.
   775			 */
   776			if (put_pfns(pfn, dma->prot, step)) {
   777				unlocked += step;
 > 778				locked += vpfn_pages(dma, iova, step);
   779			}
   780			pfn += step;
   781			iova += PAGE_SIZE * step;
   782			npage -= step;
   783		}
   784	
   785		if (do_accounting)
   786			vfio_lock_acct(dma, locked - unlocked, true);
   787	
   788		return unlocked;
   789	}
   790	

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