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McKenney" Cc: llvm@lists.linux.dev, kbuild-all@lists.01.org, GNU/Weeb Mailing List , linux-kernel@vger.kernel.org Subject: [ammarfaizi2-block:paulmck/linux-rcu/dave.2022.06.02a 56/78] kernel/rcu/tasks.h:1239:8: error: variable has incomplete type 'typeof (({ Message-ID: <202206030613.IxQYmIW8-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline List-Id: tree: https://github.com/ammarfaizi2/linux-block paulmck/linux-rcu/dave.2022.06.02a head: 2efc5c4abe4cc1259378f7c1678a93540559673c commit: cda3200416cdef7f25546cd6249fb411c8c32079 [56/78] rcu-tasks: Merge state into .b.need_qs and atomically update config: arm-buildonly-randconfig-r004-20220531 (https://download.01.org/0day-ci/archive/20220603/202206030613.IxQYmIW8-lkp@intel.com/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project b364c76683f8ef241025a9556300778c07b590c2) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/ammarfaizi2/linux-block/commit/cda3200416cdef7f25546cd6249fb411c8c32079 git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block git fetch --no-tags ammarfaizi2-block paulmck/linux-rcu/dave.2022.06.02a git checkout cda3200416cdef7f25546cd6249fb411c8c32079 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot All errors (new ones prefixed by >>): In file included from kernel/rcu/update.c:606: kernel/rcu/tasks.h:1239:8: error: operand of type 'union rcu_special' where arithmetic or pointer type is required ret = cmpxchg(&t->trc_reader_special, trs_old, trs_new); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/atomic/atomic-instrumented.h:1916:2: note: expanded from macro 'cmpxchg' arch_cmpxchg(__ai_ptr, __VA_ARGS__); \ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/atomic/atomic-arch-fallback.h:52:2: note: expanded from macro 'arch_cmpxchg' __atomic_op_fence(arch_cmpxchg, __VA_ARGS__) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/atomic.h:73:9: note: expanded from macro '__atomic_op_fence' typeof(op##_relaxed(args)) __ret; \ ^~~~~~~~~~~~~~~~~~ :39:1: note: expanded from here arch_cmpxchg_relaxed ^ arch/arm/include/asm/cmpxchg.h:212:26: note: expanded from macro 'arch_cmpxchg_relaxed' (unsigned long)(o), \ ^~~ In file included from kernel/rcu/update.c:606: kernel/rcu/tasks.h:1239:8: error: operand of type 'union rcu_special' where arithmetic or pointer type is required ret = cmpxchg(&t->trc_reader_special, trs_old, trs_new); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/atomic/atomic-instrumented.h:1916:2: note: expanded from macro 'cmpxchg' arch_cmpxchg(__ai_ptr, __VA_ARGS__); \ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/atomic/atomic-arch-fallback.h:52:2: note: expanded from macro 'arch_cmpxchg' __atomic_op_fence(arch_cmpxchg, __VA_ARGS__) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/atomic.h:73:9: note: expanded from macro '__atomic_op_fence' typeof(op##_relaxed(args)) __ret; \ ^~~~~~~~~~~~~~~~~~ :39:1: note: expanded from here arch_cmpxchg_relaxed ^ arch/arm/include/asm/cmpxchg.h:213:26: note: expanded from macro 'arch_cmpxchg_relaxed' (unsigned long)(n), \ ^~~ In file included from kernel/rcu/update.c:606: >> kernel/rcu/tasks.h:1239:8: error: variable has incomplete type 'typeof (({ }))' (aka 'void') include/linux/atomic/atomic-instrumented.h:1916:2: note: expanded from macro 'cmpxchg' arch_cmpxchg(__ai_ptr, __VA_ARGS__); \ ^ include/linux/atomic/atomic-arch-fallback.h:52:2: note: expanded from macro 'arch_cmpxchg' __atomic_op_fence(arch_cmpxchg, __VA_ARGS__) ^ include/linux/atomic.h:73:29: note: expanded from macro '__atomic_op_fence' typeof(op##_relaxed(args)) __ret; \ ^ In file included from kernel/rcu/update.c:606: kernel/rcu/tasks.h:1239:8: error: operand of type 'union rcu_special' where arithmetic or pointer type is required ret = cmpxchg(&t->trc_reader_special, trs_old, trs_new); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/atomic/atomic-instrumented.h:1916:2: note: expanded from macro 'cmpxchg' arch_cmpxchg(__ai_ptr, __VA_ARGS__); \ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/atomic/atomic-arch-fallback.h:52:2: note: expanded from macro 'arch_cmpxchg' __atomic_op_fence(arch_cmpxchg, __VA_ARGS__) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/atomic.h:75:10: note: expanded from macro '__atomic_op_fence' __ret = op##_relaxed(args); \ ^~~~~~~~~~~~~~~~~~ :40:1: note: expanded from here arch_cmpxchg_relaxed ^ arch/arm/include/asm/cmpxchg.h:212:26: note: expanded from macro 'arch_cmpxchg_relaxed' (unsigned long)(o), \ ^~~ In file included from kernel/rcu/update.c:606: kernel/rcu/tasks.h:1239:8: error: operand of type 'union rcu_special' where arithmetic or pointer type is required ret = cmpxchg(&t->trc_reader_special, trs_old, trs_new); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/atomic/atomic-instrumented.h:1916:2: note: expanded from macro 'cmpxchg' arch_cmpxchg(__ai_ptr, __VA_ARGS__); \ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/atomic/atomic-arch-fallback.h:52:2: note: expanded from macro 'arch_cmpxchg' __atomic_op_fence(arch_cmpxchg, __VA_ARGS__) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/atomic.h:75:10: note: expanded from macro '__atomic_op_fence' __ret = op##_relaxed(args); \ ^~~~~~~~~~~~~~~~~~ :40:1: note: expanded from here arch_cmpxchg_relaxed ^ arch/arm/include/asm/cmpxchg.h:213:26: note: expanded from macro 'arch_cmpxchg_relaxed' (unsigned long)(n), \ ^~~ 5 errors generated. vim +1239 kernel/rcu/tasks.h 1224 1225 /* 1226 * Do a cmpxchg() on ->trc_reader_special.b.need_qs, allowing for 1227 * the four-byte operand-size restriction of some platforms. 1228 * Returns the old value, which is often ignored. 1229 */ 1230 u8 rcu_trc_cmpxchg_need_qs(struct task_struct *t, u8 old, u8 new) 1231 { 1232 union rcu_special ret; 1233 union rcu_special trs_old = READ_ONCE(t->trc_reader_special); 1234 union rcu_special trs_new = trs_old; 1235 1236 if (trs_old.b.need_qs != old) 1237 return trs_old.b.need_qs; 1238 trs_new.b.need_qs = new; > 1239 ret = cmpxchg(&t->trc_reader_special, trs_old, trs_new); 1240 return ret.b.need_qs; 1241 } 1242 EXPORT_SYMBOL_GPL(rcu_trc_cmpxchg_need_qs); 1243 -- 0-DAY CI Kernel Test Service https://01.org/lkp