linux-kernel - Re: [PATCH] vhost: introduce O(1) vq metadata cache

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Date:   Wed, 14 Dec 2016 16:14:59 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     kbuild-all@...org, mst@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, wexu@...hat.com, peterx@...hat.com,
        vkaplans@...hat.com, maxime.coquelin@...hat.com,
        Jason Wang <jasowang@...hat.com>
Subject: Re: [PATCH] vhost: introduce O(1) vq metadata cache

Hi Jason,

[auto build test WARNING on vhost/linux-next]
[also build test WARNING on v4.9 next-20161214]
[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/Jason-Wang/vhost-introduce-O-1-vq-metadata-cache/20161214-160153
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
config: i386-randconfig-x005-201650 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   drivers/vhost/vhost.c: In function 'vhost_vq_meta_fetch':
>> drivers/vhost/vhost.c:719:9: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
     return (void *)(node->userspace_addr + (u64)addr - node->start);
            ^

vim +719 drivers/vhost/vhost.c

   703							   node->start,
   704							   node->size))
   705				return 0;
   706		}
   707		return 1;
   708	}
   709	
   710	static inline void __user *vhost_vq_meta_fetch(struct vhost_virtqueue *vq,
   711						       u64 addr, unsigned int size,
   712						       int type)
   713	{
   714		const struct vhost_umem_node *node = vq->meta_iotlb[type];
   715	
   716		if (!node)
   717			return NULL;
   718	
 > 719		return (void *)(node->userspace_addr + (u64)addr - node->start);
   720	}
   721	
   722	/* Can we switch to this memory table? */
   723	/* Caller should have device mutex but not vq mutex */
   724	static int memory_access_ok(struct vhost_dev *d, struct vhost_umem *umem,
   725				    int log_all)
   726	{
   727		int i;

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