Hi Alejandro, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on robh/for-next] [also build test WARNING on linux/master linus/master v5.16-rc2 next-20211118] [cannot apply to drm-intel/for-linux-next mkl-can-next/testing] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Alejandro-Colomar/linux-stddef-h... base: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next config: mips-randconfig-s031-20211122 (attached as .config) compiler: mips64-linux-gcc (GCC) 11.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.4-dirty # https://github.com/0day-ci/linux/commit/ed03be33a3de1708b5a06ea31cc6cd857... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Alejandro-Colomar/linux-stddef-h-linux-offsetof-h-Split-offsetof-into-a-separate-header/20211120-220144 git checkout ed03be33a3de1708b5a06ea31cc6cd8573890649 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=mips 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 >>) command-line: note: in included file: builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_ACQUIRE redefined builtin:0:0: sparse: this was the original definition builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_SEQ_CST redefined builtin:0:0: sparse: this was the original definition builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_ACQ_REL redefined builtin:0:0: sparse: this was the original definition builtin:1:9: sparse: sparse: preprocessor token __ATOMIC_RELEASE redefined builtin:0:0: sparse: this was the original definition arch/mips/kernel/signal.c:280:13: sparse: sparse: cast removes address space '__user' of expression arch/mips/kernel/signal.c:280:13: sparse: sparse: cast removes address space '__user' of expression arch/mips/kernel/signal.c:280:13: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected unsigned int [noderef] __user *__pu_ptr @@ got unsigned int [usertype] * @@ arch/mips/kernel/signal.c:280:13: sparse: expected unsigned int [noderef] __user *__pu_ptr arch/mips/kernel/signal.c:280:13: sparse: got unsigned int [usertype] * arch/mips/kernel/signal.c:280:13: sparse: sparse: cast removes address space '__user' of expression arch/mips/kernel/signal.c:293:23: sparse: sparse: cast removes address space '__user' of expression arch/mips/kernel/signal.c:293:23: sparse: sparse: cast removes address space '__user' of expression arch/mips/kernel/signal.c:293:23: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected unsigned int const [noderef] __user *__gu_ptr @@ got unsigned int * @@ arch/mips/kernel/signal.c:293:23: sparse: expected unsigned int const [noderef] __user *__gu_ptr arch/mips/kernel/signal.c:293:23: sparse: got unsigned int * arch/mips/kernel/signal.c:300:23: sparse: sparse: cast removes address space '__user' of expression arch/mips/kernel/signal.c:300:23: sparse: sparse: cast removes address space '__user' of expression arch/mips/kernel/signal.c:300:23: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected unsigned int const [noderef] __user *__gu_ptr @@ got unsigned int * @@ arch/mips/kernel/signal.c:300:23: sparse: expected unsigned int const [noderef] __user *__gu_ptr arch/mips/kernel/signal.c:300:23: sparse: got unsigned int * arch/mips/kernel/signal.c:667:17: sparse: sparse: symbol 'sys_rt_sigreturn' was not declared. Should it be static? arch/mips/kernel/signal.c:157:14: sparse: expected void const *__mptr arch/mips/kernel/signal.c:157:14: sparse: got void [noderef] __user *sc arch/mips/kernel/signal.c:157:12: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct ucontext [noderef] __user *uc @@ got struct ucontext * @@ arch/mips/kernel/signal.c:157:12: sparse: expected struct ucontext [noderef] __user *uc arch/mips/kernel/signal.c:157:12: sparse: got struct ucontext * arch/mips/kernel/signal.c:157:14: sparse: expected void const *__mptr arch/mips/kernel/signal.c:157:14: sparse: got void [noderef] __user *sc arch/mips/kernel/signal.c:157:12: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct ucontext [noderef] __user *uc @@ got struct ucontext * @@ arch/mips/kernel/signal.c:157:12: sparse: expected struct ucontext [noderef] __user *uc arch/mips/kernel/signal.c:157:12: sparse: got struct ucontext * vim +157 arch/mips/kernel/signal.c 2db9ca0a355100 Paul Burton 2015-07-27 143 bf82cb30c7e58b Paul Burton 2015-07-27 144 /* bf82cb30c7e58b Paul Burton 2015-07-27 145 * Extended context handling. bf82cb30c7e58b Paul Burton 2015-07-27 146 */ bf82cb30c7e58b Paul Burton 2015-07-27 147 bf82cb30c7e58b Paul Burton 2015-07-27 148 static inline void __user *sc_to_extcontext(void __user *sc) bf82cb30c7e58b Paul Burton 2015-07-27 149 { bf82cb30c7e58b Paul Burton 2015-07-27 150 struct ucontext __user *uc; bf82cb30c7e58b Paul Burton 2015-07-27 151 bf82cb30c7e58b Paul Burton 2015-07-27 152 /* bf82cb30c7e58b Paul Burton 2015-07-27 153 * We can just pretend the sigcontext is always embedded in a struct bf82cb30c7e58b Paul Burton 2015-07-27 154 * ucontext here, because the offset from sigcontext to extended bf82cb30c7e58b Paul Burton 2015-07-27 155 * context is the same in the struct sigframe case. bf82cb30c7e58b Paul Burton 2015-07-27 156 */ bf82cb30c7e58b Paul Burton 2015-07-27 @157 uc = container_of(sc, struct ucontext, uc_mcontext); bf82cb30c7e58b Paul Burton 2015-07-27 158 return &uc->uc_extcontext; bf82cb30c7e58b Paul Burton 2015-07-27 159 } bf82cb30c7e58b Paul Burton 2015-07-27 160 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org