[kbuild-all] [arnd-playground:compat-alloc-user-space-10 1/40] kernel/kexec.c:274:52: sparse: sparse: incorrect type in argument 3 (different address spaces)

tree: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git compat-alloc-user-space-10 head: 58da7172523fefac0902591b73596ce2b21e5038 commit: 5357a3311b528fbd96e088885c5c17a5ce670ad7 [1/40] kexec: avoid compat_alloc_user_space config: i386-randconfig-s002-20210720 (attached as .config) compiler: gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-341-g8af24329-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git/commi... git remote add arnd-playground https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git git fetch --no-tags arnd-playground compat-alloc-user-space-10 git checkout 5357a3311b528fbd96e088885c5c17a5ce670ad7 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) kernel/kexec.c:274:52: sparse: expected struct kexec_segment *segments kernel/kexec.c:274:52: sparse: got struct kexec_segment [noderef] __user *segments vim +274 kernel/kexec.c 6b27aef09fea32 Dominik Brodowski 2018-03-17 254 6b27aef09fea32 Dominik Brodowski 2018-03-17 255 SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments, 6b27aef09fea32 Dominik Brodowski 2018-03-17 256 struct kexec_segment __user *, segments, unsigned long, flags) 6b27aef09fea32 Dominik Brodowski 2018-03-17 257 { 5357a3311b528f Arnd Bergmann 2021-05-19 258 struct kexec_segment *ksegments; 5357a3311b528f Arnd Bergmann 2021-05-19 259 unsigned long bytes, result; 6b27aef09fea32 Dominik Brodowski 2018-03-17 260 6b27aef09fea32 Dominik Brodowski 2018-03-17 261 result = kexec_load_check(nr_segments, flags); 6b27aef09fea32 Dominik Brodowski 2018-03-17 262 if (result) 6b27aef09fea32 Dominik Brodowski 2018-03-17 263 return result; 6b27aef09fea32 Dominik Brodowski 2018-03-17 264 5357a3311b528f Arnd Bergmann 2021-05-19 265 bytes = nr_segments * sizeof(ksegments[0]); 5357a3311b528f Arnd Bergmann 2021-05-19 266 ksegments = kmalloc(bytes, GFP_KERNEL); 5357a3311b528f Arnd Bergmann 2021-05-19 267 if (!ksegments) 5357a3311b528f Arnd Bergmann 2021-05-19 268 return -ENOMEM; 6b27aef09fea32 Dominik Brodowski 2018-03-17 269 5357a3311b528f Arnd Bergmann 2021-05-19 270 result = copy_from_user(ksegments, segments, bytes); 5357a3311b528f Arnd Bergmann 2021-05-19 271 if (result) 5357a3311b528f Arnd Bergmann 2021-05-19 272 goto fail; 72414d3f1d22fc Maneesh Soni 2005-06-25 273 0eea08678ebe9f Minfei Huang 2016-05-23 @274 result = do_kexec_load(entry, nr_segments, segments, flags); 9b492cf58077a0 Xunlei Pang 2016-05-23 275 5357a3311b528f Arnd Bergmann 2021-05-19 276 fail: 5357a3311b528f Arnd Bergmann 2021-05-19 277 kfree(ksegments); dc009d92435f99 Eric W. Biederman 2005-06-25 278 return result; dc009d92435f99 Eric W. Biederman 2005-06-25 279 } dc009d92435f99 Eric W. Biederman 2005-06-25 280 :::::: The code at line 274 was first introduced by commit :::::: 0eea08678ebe9f7d8ef98fed974a5bf1a0dd2dd2 kexec: do a cleanup for function kexec_load :::::: TO: Minfei Huang <mnfhuang(a)gmail.com&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org