tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: d4d58949a6eac1c45ab022562c8494725e1ac094 commit: c6ed4d84a2c49de7d6f490144cca7b4a4831fb6e ARC: remove redundant READ_ONCE() in cmpxchg loop date: 1 year, 1 month ago config: arc-randconfig-s041-20230513 (https://download.01.org/0day-ci/archive/20230514/202305140134.bc2yzdg1-...@intel.com/config) compiler: arceb-elf-gcc (GCC) 12.1.0 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: v0.6.4-39-gce1a6720-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c6ed4d84a2c49de7d6f490144cca7b4a4831fb6e git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout c6ed4d84a2c49de7d6f490144cca7b4a4831fb6e # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arc olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arc SHELL=/bin/bash arch/arc/kernel/
If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <l...@intel.com> | Link: https://lore.kernel.org/oe-kbuild-all/202305140134.bc2yzdg1-...@intel.com/ sparse warnings: (new ones prefixed by >>) arch/arc/kernel/smp.c:264:48: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected unsigned long [noderef] __percpu *ipi_data_ptr @@ got unsigned long * @@ arch/arc/kernel/smp.c:264:48: sparse: expected unsigned long [noderef] __percpu *ipi_data_ptr arch/arc/kernel/smp.c:264:48: sparse: got unsigned long * arch/arc/kernel/smp.c:279:18: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile *v @@ got unsigned long [noderef] __percpu *__ai_ptr @@ arch/arc/kernel/smp.c:279:18: sparse: expected void const volatile *v arch/arc/kernel/smp.c:279:18: sparse: got unsigned long [noderef] __percpu *__ai_ptr arch/arc/kernel/smp.c:413:72: sparse: sparse: incorrect type in argument 4 (different address spaces) @@ expected void [noderef] __percpu *percpu_dev_id @@ got int *dev @@ arch/arc/kernel/smp.c:413:72: sparse: expected void [noderef] __percpu *percpu_dev_id arch/arc/kernel/smp.c:413:72: sparse: got int *dev >> arch/arc/kernel/smp.c:277:30: sparse: sparse: dereference of noderef >> expression vim +277 arch/arc/kernel/smp.c 261 262 static void ipi_send_msg_one(int cpu, enum ipi_msg_type msg) 263 { > 264 unsigned long __percpu *ipi_data_ptr = per_cpu_ptr(&ipi_data, > cpu); 265 unsigned long old, new; 266 unsigned long flags; 267 268 pr_debug("%d Sending msg [%d] to %d\n", smp_processor_id(), msg, cpu); 269 270 local_irq_save(flags); 271 272 /* 273 * Atomically write new msg bit (in case others are writing too), 274 * and read back old value 275 */ 276 do { > 277 new = old = *ipi_data_ptr; 278 new |= 1U << msg; 279 } while (cmpxchg(ipi_data_ptr, old, new) != old); 280 281 /* 282 * Call the platform specific IPI kick function, but avoid if possible: 283 * Only do so if there's no pending msg from other concurrent sender(s). 284 * Otherwise, receiver will see this msg as well when it takes the 285 * IPI corresponding to that msg. This is true, even if it is already in 286 * IPI handler, because !@old means it has not yet dequeued the msg(s) 287 * so @new msg can be a free-loader 288 */ 289 if (plat_smp_ops.ipi_send && !old) 290 plat_smp_ops.ipi_send(cpu); 291 292 local_irq_restore(flags); 293 } 294 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc
