Re: [Xen-devel] [PATCH net v3] xen-netback: fix race condition on XenBus disconnect

[kbuild test robot <lkp@xxxxxxxxx>]

Hi Igor,

[auto build test WARNING on net/master]

url:    
https://github.com/0day-ci/linux/commits/Igor-Druzhinin/xen-netback-fix-race-condition-on-XenBus-disconnect/20170310-055447
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

   include/linux/compiler.h:264:8: sparse: attribute 'no_sanitize_address': 
unknown attribute
>> drivers/net/xen-netback/interface.c:178:22: sparse: incompatible types in 
>> comparison expression (different address spaces)
   drivers/net/xen-netback/interface.c:237:22: sparse: incompatible types in 
comparison expression (different address spaces)
   drivers/net/xen-netback/interface.c:389:22: sparse: incompatible types in 
comparison expression (different address spaces)

vim +178 drivers/net/xen-netback/interface.c

   162  }
   163  
   164  static int xenvif_start_xmit(struct sk_buff *skb, struct net_device 
*dev)
   165  {
   166          struct xenvif *vif = netdev_priv(dev);
   167          struct xenvif_queue *queue = NULL;
   168          unsigned int num_queues;
   169          u16 index;
   170          struct xenvif_rx_cb *cb;
   171  
   172          BUG_ON(skb->dev != dev);
   173  
   174          /* Drop the packet if queues are not set up.
   175           * This handler should be called inside an RCU read section
   176           * so we don't need to enter it here explicitly.
   177           */
 > 178          num_queues = rcu_dereference(vif)->num_queues;
   179          if (num_queues < 1)
   180                  goto drop;
   181  
   182          /* Obtain the queue to be used to transmit this packet */
   183          index = skb_get_queue_mapping(skb);
   184          if (index >= num_queues) {
   185                  pr_warn_ratelimited("Invalid queue %hu for packet on 
interface %s\n.",
   186                                      index, vif->dev->name);

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

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