Re: [Qemu-devel] [PATCH v14 3/5] virtio-balloon: VIRTIO_BALLOON_F_SG

[kbuild test robot]

Hi Wei,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.13-rc5 next-20170817]
[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/Wei-Wang/lib-xbitmap-Introduce-xbitmap/20170820-035516
config: xtensa-allmodconfig (attached as .config)
compiler: xtensa-linux-gcc (GCC) 4.9.0
reproduce:
        wget 
https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O 
~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=xtensa 

All errors (new ones prefixed by >>):

   drivers/virtio/virtio_balloon.c: In function 'tell_host_sgs':
>> drivers/virtio/virtio_balloon.c:203:3: error: implicit declaration of 
>> function 'pfn_to_kaddr' [-Werror=implicit-function-declaration]
      sg_addr = (void *)pfn_to_kaddr(sg_pfn_start);
      ^
   cc1: some warnings being treated as errors

vim +/pfn_to_kaddr +203 drivers/virtio/virtio_balloon.c

   176  
   177  /*
   178   * Send balloon pages in sgs to host. The balloon pages are recorded in 
the
   179   * page xbitmap. Each bit in the bitmap corresponds to a page of 
PAGE_SIZE.
   180   * The page xbitmap is searched for continuous "1" bits, which 
correspond
   181   * to continuous pages, to chunk into sgs.
   182   *
   183   * @page_xb_start and @page_xb_end form the range of bits in the 
xbitmap that
   184   * need to be searched.
   185   */
   186  static void tell_host_sgs(struct virtio_balloon *vb,
   187                            struct virtqueue *vq,
   188                            unsigned long page_xb_start,
   189                            unsigned long page_xb_end)
   190  {
   191          unsigned long sg_pfn_start, sg_pfn_end;
   192          void *sg_addr;
   193          uint32_t sg_len, sg_max_len = round_down(UINT_MAX, PAGE_SIZE);
   194  
   195          sg_pfn_start = page_xb_start;
   196          while (sg_pfn_start < page_xb_end) {
   197                  sg_pfn_start = xb_find_next_bit(&vb->page_xb, 
sg_pfn_start,
   198                                                  page_xb_end, 1);
   199                  if (sg_pfn_start == page_xb_end + 1)
   200                          break;
   201                  sg_pfn_end = xb_find_next_bit(&vb->page_xb, 
sg_pfn_start + 1,
   202                                                page_xb_end, 0);
 > 203                  sg_addr = (void *)pfn_to_kaddr(sg_pfn_start);
   204                  sg_len = (sg_pfn_end - sg_pfn_start) << PAGE_SHIFT;
   205                  while (sg_len > sg_max_len) {
   206                          send_balloon_page_sg(vb, vq, sg_addr, 
sg_max_len);
   207                          sg_addr += sg_max_len;
   208                          sg_len -= sg_max_len;
   209                  }
   210                  send_balloon_page_sg(vb, vq, sg_addr, sg_len);
   211                  xb_zero(&vb->page_xb, sg_pfn_start, sg_pfn_end);
   212                  sg_pfn_start = sg_pfn_end + 1;
   213          }
   214  }
   215  

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

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