Hi, [auto build test WARNING on v4.7-rc3] [cannot apply to next-20160609] [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/Liang-Li/Fast-balloon-fast-live-migration/20160613-175812 config: m68k-allyesconfig (attached as .config) compiler: m68k-linux-gcc (GCC) 4.9.0 reproduce: wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=m68k All warnings (new ones prefixed by >>): drivers/virtio/virtio_balloon.c: In function 'init_pfn_range': >> drivers/virtio/virtio_balloon.c:123:2: warning: left shift count >= width of >> type vb->min_pfn = (1UL << 48); ^ vim +123 drivers/virtio/virtio_balloon.c 107 unsigned long pfn = page_to_pfn(page); 108 109 BUILD_BUG_ON(PAGE_SHIFT < VIRTIO_BALLOON_PFN_SHIFT); 110 /* Convert pfn from Linux page size to balloon page size. */ 111 return pfn * VIRTIO_BALLOON_PAGES_PER_PAGE; 112 } 113 114 static void balloon_ack(struct virtqueue *vq) 115 { 116 struct virtio_balloon *vb = vq->vdev->priv; 117 118 wake_up(&vb->acked); 119 } 120 121 static inline void init_pfn_range(struct virtio_balloon *vb) 122 { > 123 vb->min_pfn = (1UL << 48); 124 vb->max_pfn = 0; 125 } 126 127 static inline void update_pfn_range(struct virtio_balloon *vb, 128 struct page *page) 129 { 130 unsigned long balloon_pfn = page_to_balloon_pfn(page); 131 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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