linux-kernel - Re: [PATCH v13 5/5] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE

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Date:   Fri, 4 Aug 2017 00:11:35 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Wei Wang <wei.w.wang@...el.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-mm@...ck.org, mst@...hat.com, mhocko@...nel.org,
        mawilcox@...rosoft.com, akpm@...ux-foundation.org,
        virtio-dev@...ts.oasis-open.org, david@...hat.com,
        cornelia.huck@...ibm.com, mgorman@...hsingularity.net,
        aarcange@...hat.com, amit.shah@...hat.com, pbonzini@...hat.com,
        liliang.opensource@...il.com, yang.zhang.wz@...il.com,
        quan.xu@...yun.com
Subject: Re: [PATCH v13 5/5] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_VQ

Hi Wei,

[auto build test WARNING on v4.13-rc3]
[also build test WARNING on next-20170803]
[cannot apply to linus/master linux/master mmotm/master]
[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/Virtio-balloon-Enhancement/20170803-223740
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 warnings (new ones prefixed by >>):

   drivers//virtio/virtio_balloon.c: In function 'tell_host_sgs':
   drivers//virtio/virtio_balloon.c:210:3: error: implicit declaration of function 'pfn_to_kaddr' [-Werror=implicit-function-declaration]
      sg_addr = pfn_to_kaddr(sg_pfn_start);
      ^
   drivers//virtio/virtio_balloon.c:210:11: warning: assignment makes pointer from integer without a cast
      sg_addr = pfn_to_kaddr(sg_pfn_start);
              ^
   drivers//virtio/virtio_balloon.c: In function 'virtio_balloon_send_free_pages':
>> drivers//virtio/virtio_balloon.c:523:15: warning: initialization makes pointer from integer without a cast
     void *addr = pfn_to_kaddr(pfn);
                  ^
   cc1: some warnings being treated as errors

vim +523 drivers//virtio/virtio_balloon.c

   518	
   519	static void virtio_balloon_send_free_pages(void *opaque, unsigned long pfn,
   520						   unsigned long nr_pages)
   521	{
   522		struct virtio_balloon *vb = (struct virtio_balloon *)opaque;
 > 523		void *addr = pfn_to_kaddr(pfn);
   524		uint32_t len = nr_pages << PAGE_SHIFT;
   525	
   526		send_one_sg(vb, vb->free_page_vq, addr, len, 1);
   527	}
   528	

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