Re: [PATCH v2] vhost: drop vring dependency on iotlb

[kbuild test robot <lkp@intel.com>]

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Hi "Michael,

I love your patch! Yet something to improve:

[auto build test ERROR on vhost/linux-next]
[also build test ERROR on linus/master v5.7-rc1]
[cannot apply to linux/master next-20200413]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Michael-S-Tsirkin/vhost-drop-vring-dependency-on-iotlb/20200403-234646
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
config: sparc-randconfig-a001-20200413 (attached as .config)
compiler: sparc-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=9.3.0 make.cross ARCH=sparc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   arch/sparc/kernel/head_32.o: in function `current_pc':
   arch/sparc/kernel/head_32.S:121:(.head.text+0x2040): relocation truncated to fit: R_SPARC_WDISP22 against `.init.text'
   arch/sparc/kernel/head_32.o: in function `halt_notsup':
   arch/sparc/kernel/head_32.S:198:(.head.text+0x2100): relocation truncated to fit: R_SPARC_WDISP22 against `.init.text'
   arch/sparc/kernel/process_32.o:(.fixup+0x4): relocation truncated to fit: R_SPARC_WDISP22 against `.text'
   arch/sparc/kernel/process_32.o:(.fixup+0xc): relocation truncated to fit: R_SPARC_WDISP22 against `.text'
   arch/sparc/kernel/signal_32.o:(.fixup+0x0): relocation truncated to fit: R_SPARC_WDISP22 against `.text'
   arch/sparc/kernel/signal_32.o:(.fixup+0x8): relocation truncated to fit: R_SPARC_WDISP22 against `.text'
   arch/sparc/kernel/signal_32.o:(.fixup+0x10): relocation truncated to fit: R_SPARC_WDISP22 against `.text'
   arch/sparc/kernel/signal_32.o:(.fixup+0x18): relocation truncated to fit: R_SPARC_WDISP22 against `.text'
   arch/sparc/kernel/signal_32.o:(.fixup+0x20): relocation truncated to fit: R_SPARC_WDISP22 against `.text'
   arch/sparc/kernel/signal_32.o:(.fixup+0x28): relocation truncated to fit: R_SPARC_WDISP22 against `.text'
   arch/sparc/kernel/signal_32.o:(.fixup+0x30): additional relocation overflows omitted from the output
   sparc-linux-ld: drivers/vhost/vringh.o: in function `iotlb_translate':
>> drivers/vhost/vringh.c:1079: undefined reference to `vhost_iotlb_itree_first'

vim +1079 drivers/vhost/vringh.c

f558a845c3a043 Dave Jones 2013-05-03  1061  
9ad9c49cfe970b Jason Wang 2020-03-26  1062  static int iotlb_translate(const struct vringh *vrh,
9ad9c49cfe970b Jason Wang 2020-03-26  1063  			   u64 addr, u64 len, struct bio_vec iov[],
9ad9c49cfe970b Jason Wang 2020-03-26  1064  			   int iov_size, u32 perm)
9ad9c49cfe970b Jason Wang 2020-03-26  1065  {
9ad9c49cfe970b Jason Wang 2020-03-26  1066  	struct vhost_iotlb_map *map;
9ad9c49cfe970b Jason Wang 2020-03-26  1067  	struct vhost_iotlb *iotlb = vrh->iotlb;
9ad9c49cfe970b Jason Wang 2020-03-26  1068  	int ret = 0;
9ad9c49cfe970b Jason Wang 2020-03-26  1069  	u64 s = 0;
9ad9c49cfe970b Jason Wang 2020-03-26  1070  
9ad9c49cfe970b Jason Wang 2020-03-26  1071  	while (len > s) {
9ad9c49cfe970b Jason Wang 2020-03-26  1072  		u64 size, pa, pfn;
9ad9c49cfe970b Jason Wang 2020-03-26  1073  
9ad9c49cfe970b Jason Wang 2020-03-26  1074  		if (unlikely(ret >= iov_size)) {
9ad9c49cfe970b Jason Wang 2020-03-26  1075  			ret = -ENOBUFS;
9ad9c49cfe970b Jason Wang 2020-03-26  1076  			break;
9ad9c49cfe970b Jason Wang 2020-03-26  1077  		}
9ad9c49cfe970b Jason Wang 2020-03-26  1078  
9ad9c49cfe970b Jason Wang 2020-03-26 @1079  		map = vhost_iotlb_itree_first(iotlb, addr,
9ad9c49cfe970b Jason Wang 2020-03-26  1080  					      addr + len - 1);
9ad9c49cfe970b Jason Wang 2020-03-26  1081  		if (!map || map->start > addr) {
9ad9c49cfe970b Jason Wang 2020-03-26  1082  			ret = -EINVAL;
9ad9c49cfe970b Jason Wang 2020-03-26  1083  			break;
9ad9c49cfe970b Jason Wang 2020-03-26  1084  		} else if (!(map->perm & perm)) {
9ad9c49cfe970b Jason Wang 2020-03-26  1085  			ret = -EPERM;
9ad9c49cfe970b Jason Wang 2020-03-26  1086  			break;
9ad9c49cfe970b Jason Wang 2020-03-26  1087  		}
9ad9c49cfe970b Jason Wang 2020-03-26  1088  
9ad9c49cfe970b Jason Wang 2020-03-26  1089  		size = map->size - addr + map->start;
9ad9c49cfe970b Jason Wang 2020-03-26  1090  		pa = map->addr + addr - map->start;
9ad9c49cfe970b Jason Wang 2020-03-26  1091  		pfn = pa >> PAGE_SHIFT;
9ad9c49cfe970b Jason Wang 2020-03-26  1092  		iov[ret].bv_page = pfn_to_page(pfn);
9ad9c49cfe970b Jason Wang 2020-03-26  1093  		iov[ret].bv_len = min(len - s, size);
9ad9c49cfe970b Jason Wang 2020-03-26  1094  		iov[ret].bv_offset = pa & (PAGE_SIZE - 1);
9ad9c49cfe970b Jason Wang 2020-03-26  1095  		s += size;
9ad9c49cfe970b Jason Wang 2020-03-26  1096  		addr += size;
9ad9c49cfe970b Jason Wang 2020-03-26  1097  		++ret;
9ad9c49cfe970b Jason Wang 2020-03-26  1098  	}
9ad9c49cfe970b Jason Wang 2020-03-26  1099  
9ad9c49cfe970b Jason Wang 2020-03-26  1100  	return ret;
9ad9c49cfe970b Jason Wang 2020-03-26  1101  }
9ad9c49cfe970b Jason Wang 2020-03-26  1102  

:::::: The code at line 1079 was first introduced by commit
:::::: 9ad9c49cfe970b053bb0ef323b682dd1b4d4f8a0 vringh: IOTLB support

:::::: TO: Jason Wang <jasowang@redhat.com>
:::::: CC: Michael S. Tsirkin <mst@redhat.com>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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