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SubjectRe: [PATCH 2/5] vringh: IOTLB support
Hi Jason,

I love your patch! Yet something to improve:

[auto build test ERROR on vhost/linux-next]
[also build test ERROR on linux/master linus/master v5.5-rc6 next-20200117]
[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/Jason-Wang/vDPA-support/20200117-170243
base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
config: nios2-randconfig-a001-20200117 (attached as .config)
compiler: nios2-linux-gcc (GCC) 7.5.0
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=7.5.0 make.cross ARCH=nios2

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

All errors (new ones prefixed by >>):

drivers/vhost/vringh.o: In function `iotlb_translate':
>> drivers/vhost/vringh.c:1079: undefined reference to `vhost_iotlb_itree_first'
drivers/vhost/vringh.c:1079:(.text+0x45c): relocation truncated to fit: R_NIOS2_CALL26 against `vhost_iotlb_itree_first'

vim +1079 drivers/vhost/vringh.c

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

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