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