tree: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git vhost head: 74d5d28b9903cd48c22c04f887354a3d49621c13 commit: 47349198d7a879febab785a00c39c2de379f35c2 [1/9] virtio_balloon: fix deadlock on OOM config: sh-allyesconfig (attached as .config) compiler: sh4-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 47349198d7a879febab785a00c39c2de379f35c2 # save the attached .config to linux build tree make.cross ARCH=sh All errors (new ones prefixed by >>): drivers//virtio/virtio_balloon.c: In function 'fill_balloon': >> drivers//virtio/virtio_balloon.c:167:3: error: implicit declaration of function 'balloon_page_push'; did you mean 'balloon_page_putback'? [-Werror=implicit-function-declaration] balloon_page_push(&pages, page); ^~~~~~~~~~~~~~~~~ balloon_page_putback >> drivers//virtio/virtio_balloon.c:174:17: error: implicit declaration of function 'balloon_page_pop'; did you mean 'balloon_page_alloc'? [-Werror=implicit-function-declaration] while ((page = balloon_page_pop(&pages))) { ^~~~~~~~~~~~~~~~ balloon_page_alloc drivers//virtio/virtio_balloon.c:174:15: warning: assignment makes pointer from integer without a cast [-Wint-conversion] while ((page = balloon_page_pop(&pages))) { ^ cc1: some warnings being treated as errors vim +167 drivers//virtio/virtio_balloon.c 143 144 static unsigned fill_balloon(struct virtio_balloon *vb, size_t num) 145 { 146 unsigned num_allocated_pages; 147 unsigned num_pfns; 148 struct page *page; 149 LIST_HEAD(pages); 150 151 /* We can only do one array worth at a time. */ 152 num = min(num, ARRAY_SIZE(vb->pfns)); 153 154 for (num_pfns = 0; num_pfns < num; 155 num_pfns += VIRTIO_BALLOON_PAGES_PER_PAGE) { 156 struct page *page = balloon_page_alloc(); 157 158 if (!page) { 159 dev_info_ratelimited(&vb->vdev->dev, 160 "Out of puff! Can't get %u pages\n", 161 VIRTIO_BALLOON_PAGES_PER_PAGE); 162 /* Sleep for at least 1/5 of a second before retry. */ 163 msleep(200); 164 break; 165 } 166 > 167 balloon_page_push(&pages, page); 168 } 169 170 mutex_lock(&vb->balloon_lock); 171 172 vb->num_pfns = 0; 173 > 174 while ((page = balloon_page_pop(&pages))) { 175 balloon_page_enqueue(&vb->vb_dev_info, page); 176 177 vb->num_pfns += VIRTIO_BALLOON_PAGES_PER_PAGE; 178 179 set_page_pfns(vb, vb->pfns + vb->num_pfns, page); 180 vb->num_pages += VIRTIO_BALLOON_PAGES_PER_PAGE; 181 if (!virtio_has_feature(vb->vdev, 182 VIRTIO_BALLOON_F_DEFLATE_ON_OOM)) 183 adjust_managed_page_count(page, -1); 184 } 185 186 num_allocated_pages = vb->num_pfns; 187 /* Did we get any? */ 188 if (vb->num_pfns != 0) 189 tell_host(vb, vb->inflate_vq); 190 mutex_unlock(&vb->balloon_lock); 191 192 return num_allocated_pages; 193 } 194 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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