tree: https://github.com/0day-ci/linux/commits/UPDATE-20200501-062253/Chris-Wil... head: e14b572311dd64ebaee8f6f0d57b68ba60c2b92e commit: e14b572311dd64ebaee8f6f0d57b68ba60c2b92e [1/1] drm/i915: Implement vm_ops->access for gdb access into mmaps config: i386-allyesconfig (attached as .config) compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0 reproduce: git checkout e14b572311dd64ebaee8f6f0d57b68ba60c2b92e # save the attached .config to linux build tree make ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from include/asm-generic/bug.h:5:0, from arch/x86/include/asm/bug.h:83, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/mm.h:9, from include/linux/mman.h:5, from drivers/gpu/drm/i915/gem/i915_gem_mman.c:8: drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c: In function '__igt_mmap_access': #define IS_ERR_VALUE(x) unlikely((unsigned long)(void *)(x) >= (unsigned long)-MAX_ERRNO) ^ include/linux/compiler.h:78:42: note: in definition of macro 'unlikely' # define unlikely(x) __builtin_expect(!!(x), 0) ^ if (IS_ERR_VALUE(addr)) ^~~~~~~~~~~~ vim +/IS_ERR_VALUE +996 drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c 973 974 static int __igt_mmap_access(struct drm_i915_private *i915, 975 struct drm_i915_gem_object *obj, 976 enum i915_mmap_type type) 977 { 978 struct i915_mmap_offset *mmo; 979 unsigned long __user *ptr; 980 unsigned long A, B; 981 unsigned long x, y; 982 u64 addr; 983 int err; 984 985 memset(&A, 0xAA, sizeof(A)); 986 memset(&B, 0xBB, sizeof(B)); 987 988 if (!can_mmap(obj, type) || !can_access(obj)) 989 return 0; 990 991 mmo = mmap_offset_attach(obj, type, NULL); 992 if (IS_ERR(mmo)) 993 return PTR_ERR(mmo); 994 995 addr = igt_mmap_node(i915, &mmo->vma_node, 0, PROT_WRITE, MAP_SHARED); 997 return addr; 998 ptr = u64_to_user_ptr(addr); 999 1000 err = __put_user(A, ptr); 1001 if (err) { 1002 pr_err("%s(%s): failed to write into user mmap\n", 1003 obj->mm.region->name, repr_mmap_type(type)); 1004 goto out_unmap; 1005 } 1006 1007 err = access_process_vm(current, addr, &x, sizeof(x), 0); 1008 if (err != sizeof(x)) { 1009 pr_err("%s(%s): access_process_vm() read failed\n", 1010 obj->mm.region->name, repr_mmap_type(type)); 1011 goto out_unmap; 1012 } 1013 1014 err = access_process_vm(current, addr, &B, sizeof(B), FOLL_WRITE); 1015 if (err != sizeof(B)) { 1016 pr_err("%s(%s): access_process_vm() write failed\n", 1017 obj->mm.region->name, repr_mmap_type(type)); 1018 goto out_unmap; 1019 } 1020 1021 err = __get_user(y, ptr); 1022 if (err) { 1023 pr_err("%s(%s): failed to read from user mmap\n", 1024 obj->mm.region->name, repr_mmap_type(type)); 1025 goto out_unmap; 1026 } 1027 1028 if (x != A || y != B) { 1029 pr_err("%s(%s): failed to read/write values, found (%lx, %lx)\n", 1030 obj->mm.region->name, repr_mmap_type(type), 1031 x, y); 1032 err = -EINVAL; 1033 goto out_unmap; 1034 } 1035 1036 out_unmap: 1037 vm_munmap(addr, obj->base.size); 1038 return err; 1039 } 1040 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org