linux-kernel - Re: [PATCH v3 kernel 4/7] virtio-balloon: speed up inflate/deflate process

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Date:	Mon, 8 Aug 2016 16:17:49 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Liang Li <liang.z.li@...el.com>
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, linux-mm@...ck.org,
	virtio-dev@...ts.oasis-open.org, kvm@...r.kernel.org,
	qemu-devel@...gnu.org, quintela@...hat.com, dgilbert@...hat.com,
	dave.hansen@...el.com, Liang Li <liang.z.li@...el.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Amit Shah <amit.shah@...hat.com>
Subject: Re: [PATCH v3 kernel 4/7] virtio-balloon: speed up inflate/deflate
 process

Hi Liang,

[auto build test WARNING on linus/master]
[also build test WARNING on v4.8-rc1 next-20160805]
[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/Extend-virtio-balloon-for-fast-de-inflating-fast-live-migration/20160808-144551
config: s390-default_defconfig (attached as .config)
compiler: s390x-linux-gnu-gcc (Debian 5.4.0-6) 5.4.0 20160609
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=s390 

All warnings (new ones prefixed by >>):

   drivers/virtio/virtio_balloon.c: In function 'tell_host':
>> drivers/virtio/virtio_balloon.c:188:1: warning: the frame size of 1456 bytes is larger than 1024 bytes [-Wframe-larger-than=]
    }
    ^

vim +188 drivers/virtio/virtio_balloon.c

112d1263 Liang Li           2016-08-08  172  			msleep(2);
112d1263 Liang Li           2016-08-08  173  		if (virtqueue_add_outbuf(vq, sg2, nr_buf, vb, GFP_KERNEL) == 0)
112d1263 Liang Li           2016-08-08  174  			virtqueue_kick(vq);
6b35e407 Rusty Russell      2008-02-04  175  
112d1263 Liang Li           2016-08-08  176  	} else {
6b35e407 Rusty Russell      2008-02-04  177  		sg_init_one(&sg, vb->pfns, sizeof(vb->pfns[0]) * vb->num_pfns);
6b35e407 Rusty Russell      2008-02-04  178  
112d1263 Liang Li           2016-08-08  179  		/* We should always be able to add one buffer to an empty
112d1263 Liang Li           2016-08-08  180  		 * queue. */
4951cc90 Rusty Russell      2014-03-13  181  		virtqueue_add_outbuf(vq, &sg, 1, vb, GFP_KERNEL);
946cfe0e Michael S. Tsirkin 2010-04-12  182  		virtqueue_kick(vq);
112d1263 Liang Li           2016-08-08  183  	}
6b35e407 Rusty Russell      2008-02-04  184  
6b35e407 Rusty Russell      2008-02-04  185  	/* When host has read buffer, this completes via balloon_ack */
9c378abc Michael S. Tsirkin 2012-07-02  186  	wait_event(vb->acked, virtqueue_get_buf(vq, &len));
fd0e21c3 Petr Mladek        2016-01-25  187  
6b35e407 Rusty Russell      2008-02-04 @188  }
6b35e407 Rusty Russell      2008-02-04  189  
87c9403b Michael S. Tsirkin 2016-05-17  190  static void set_page_pfns(struct virtio_balloon *vb,
87c9403b Michael S. Tsirkin 2016-05-17  191  			  __virtio32 pfns[], struct page *page)
3ccc9372 Michael S. Tsirkin 2012-04-12  192  {
3ccc9372 Michael S. Tsirkin 2012-04-12  193  	unsigned int i;
3ccc9372 Michael S. Tsirkin 2012-04-12  194  
3ccc9372 Michael S. Tsirkin 2012-04-12  195  	/* Set balloon pfns pointing at this page.
3ccc9372 Michael S. Tsirkin 2012-04-12  196  	 * Note that the first pfn points at start of the page. */

:::::: The code at line 188 was first introduced by commit
:::::: 6b35e40767c6c1ac783330109ae8e0c09ea6bc82 virtio: balloon driver

:::::: TO: Rusty Russell <rusty@...tcorp.com.au>
:::::: CC: Rusty Russell <rusty@...tcorp.com.au>

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