[intel-gvt-linux:topic/gvt-xengt 25/45] drivers/gpu/drm/i915/gvt/kvmgt.c:1057:45: sparse: warning: cast removes address space '<asn:1>' of expression
kbuild test robot
lkp at intel.com
Fri Feb 22 23:03:40 UTC 2019
tree: https://github.com/intel/gvt-linux topic/gvt-xengt
head: 51807e294b7edf551b6976005440312974581311
commit: 694614dee5496fbc9178f100fef7812ec3741162 [25/45] drm/i915/gvt: Add support to new VFIO subregion VFIO_REGION_SUBTYPE_DEVICE_STATE
reproduce:
# apt-get install sparse
git checkout 694614dee5496fbc9178f100fef7812ec3741162
make ARCH=x86_64 allmodconfig
make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'
All warnings (new ones prefixed by >>):
drivers/gpu/drm/i915/gvt/kvmgt.c:672:15: sparse: error: undefined identifier 'intel_vgpu_register_region'
drivers/gpu/drm/i915/gvt/kvmgt.c:965:21: sparse: warning: incorrect type in assignment (different address spaces)
drivers/gpu/drm/i915/gvt/kvmgt.c:965:21: sparse: expected void *aperture_va
drivers/gpu/drm/i915/gvt/kvmgt.c:965:21: sparse: got void [noderef] <asn:2> *
drivers/gpu/drm/i915/gvt/kvmgt.c:976:26: sparse: warning: incorrect type in argument 1 (different address spaces)
drivers/gpu/drm/i915/gvt/kvmgt.c:976:26: sparse: expected void [noderef] <asn:2> *vaddr
drivers/gpu/drm/i915/gvt/kvmgt.c:976:26: sparse: got void *aperture_va
>> drivers/gpu/drm/i915/gvt/kvmgt.c:1057:45: sparse: warning: cast removes address space '<asn:1>' of expression
drivers/gpu/drm/i915/gvt/kvmgt.c:1135:45: sparse: warning: cast removes address space '<asn:1>' of expression
vim +1057 drivers/gpu/drm/i915/gvt/kvmgt.c
1048
1049 static ssize_t intel_vgpu_read(struct mdev_device *mdev, char __user *buf,
1050 size_t count, loff_t *ppos)
1051 {
1052 unsigned int done = 0;
1053 int ret;
1054 unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
1055
1056 if (index >= VFIO_PCI_NUM_REGIONS)
> 1057 return intel_vgpu_rw(mdev, (char *)buf, count, ppos, false);
1058
1059 while (count) {
1060 size_t filled;
1061
1062 /* Only support GGTT entry 8 bytes read */
1063 if (count >= 8 && !(*ppos % 8) &&
1064 gtt_entry(mdev, ppos)) {
1065 u64 val;
1066
1067 ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
1068 ppos, false);
1069 if (ret <= 0)
1070 goto read_err;
1071
1072 if (copy_to_user(buf, &val, sizeof(val)))
1073 goto read_err;
1074
1075 filled = 8;
1076 } else if (count >= 4 && !(*ppos % 4)) {
1077 u32 val;
1078
1079 ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
1080 ppos, false);
1081 if (ret <= 0)
1082 goto read_err;
1083
1084 if (copy_to_user(buf, &val, sizeof(val)))
1085 goto read_err;
1086
1087 filled = 4;
1088 } else if (count >= 2 && !(*ppos % 2)) {
1089 u16 val;
1090
1091 ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
1092 ppos, false);
1093 if (ret <= 0)
1094 goto read_err;
1095
1096 if (copy_to_user(buf, &val, sizeof(val)))
1097 goto read_err;
1098
1099 filled = 2;
1100 } else {
1101 u8 val;
1102
1103 ret = intel_vgpu_rw(mdev, &val, sizeof(val), ppos,
1104 false);
1105 if (ret <= 0)
1106 goto read_err;
1107
1108 if (copy_to_user(buf, &val, sizeof(val)))
1109 goto read_err;
1110
1111 filled = 1;
1112 }
1113
1114 count -= filled;
1115 done += filled;
1116 *ppos += filled;
1117 buf += filled;
1118 }
1119
1120 return done;
1121
1122 read_err:
1123 return -EFAULT;
1124 }
1125
---
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