tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 684a64bf32b6e488004e0ad7f0d7e922798f65b6 commit: f2519d4d4fc4d36f2b58c5614357de9f5b4032fc ARC: Emulate one-byte cmpxchg date: 12 days ago config: arc-randconfig-r123-20240925 (https://download.01.org/0day-ci/archive/20240925/202409251336.toc0tvwb-...@intel.com/config) compiler: arc-elf-gcc (GCC) 13.2.0 reproduce: (https://download.01.org/0day-ci/archive/20240925/202409251336.toc0tvwb-...@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <l...@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202409251336.toc0tvwb-...@intel.com/ sparse warnings: (new ones prefixed by >>) arch/arc/kernel/smp.c:252:48: 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:252:48: sparse: expected unsigned long [noderef] __percpu *ipi_data_ptr arch/arc/kernel/smp.c:252:48: sparse: got unsigned long * arch/arc/kernel/smp.c:267:18: 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:267:18: sparse: expected void const volatile *v arch/arc/kernel/smp.c:267:18: sparse: got unsigned long [noderef] __percpu *__ai_ptr >> arch/arc/kernel/smp.c:267:18: sparse: sparse: cast removes address space >> '__percpu' of expression >> arch/arc/kernel/smp.c:267:18: sparse: sparse: cast removes address space >> '__percpu' of expression arch/arc/kernel/smp.c:401:72: 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:401:72: sparse: expected void [noderef] __percpu *percpu_dev_id arch/arc/kernel/smp.c:401:72: sparse: got int *dev arch/arc/kernel/smp.c:265:30: sparse: sparse: dereference of noderef expression vim +/__percpu +267 arch/arc/kernel/smp.c 41195d236e8445 Vineet Gupta 2013-01-18 249 ddf84433f411b6 Vineet Gupta 2013-11-25 250 static void ipi_send_msg_one(int cpu, enum ipi_msg_type msg) 41195d236e8445 Vineet Gupta 2013-01-18 251 { f2a4aa5646687f Vineet Gupta 2013-11-26 252 unsigned long __percpu *ipi_data_ptr = per_cpu_ptr(&ipi_data, cpu); d8e8c7dda11f5d Vineet Gupta 2013-11-28 253 unsigned long old, new; 41195d236e8445 Vineet Gupta 2013-01-18 254 unsigned long flags; 41195d236e8445 Vineet Gupta 2013-01-18 255 f2a4aa5646687f Vineet Gupta 2013-11-26 256 pr_debug("%d Sending msg [%d] to %d\n", smp_processor_id(), msg, cpu); f2a4aa5646687f Vineet Gupta 2013-11-26 257 41195d236e8445 Vineet Gupta 2013-01-18 258 local_irq_save(flags); 41195d236e8445 Vineet Gupta 2013-01-18 259 d8e8c7dda11f5d Vineet Gupta 2013-11-28 260 /* d8e8c7dda11f5d Vineet Gupta 2013-11-28 261 * Atomically write new msg bit (in case others are writing too), d8e8c7dda11f5d Vineet Gupta 2013-11-28 262 * and read back old value d8e8c7dda11f5d Vineet Gupta 2013-11-28 263 */ d8e8c7dda11f5d Vineet Gupta 2013-11-28 264 do { c6ed4d84a2c49d Bang Li 2022-03-19 265 new = old = *ipi_data_ptr; d8e8c7dda11f5d Vineet Gupta 2013-11-28 266 new |= 1U << msg; d8e8c7dda11f5d Vineet Gupta 2013-11-28 @267 } while (cmpxchg(ipi_data_ptr, old, new) != old); 41195d236e8445 Vineet Gupta 2013-01-18 268 d8e8c7dda11f5d Vineet Gupta 2013-11-28 269 /* d8e8c7dda11f5d Vineet Gupta 2013-11-28 270 * Call the platform specific IPI kick function, but avoid if possible: d8e8c7dda11f5d Vineet Gupta 2013-11-28 271 * Only do so if there's no pending msg from other concurrent sender(s). 82a423053eb3cf Changcheng Deng 2021-08-14 272 * Otherwise, receiver will see this msg as well when it takes the d8e8c7dda11f5d Vineet Gupta 2013-11-28 273 * IPI corresponding to that msg. This is true, even if it is already in d8e8c7dda11f5d Vineet Gupta 2013-11-28 274 * IPI handler, because !@old means it has not yet dequeued the msg(s) d8e8c7dda11f5d Vineet Gupta 2013-11-28 275 * so @new msg can be a free-loader d8e8c7dda11f5d Vineet Gupta 2013-11-28 276 */ d8e8c7dda11f5d Vineet Gupta 2013-11-28 277 if (plat_smp_ops.ipi_send && !old) ddf84433f411b6 Vineet Gupta 2013-11-25 278 plat_smp_ops.ipi_send(cpu); 41195d236e8445 Vineet Gupta 2013-01-18 279 41195d236e8445 Vineet Gupta 2013-01-18 280 local_irq_restore(flags); 41195d236e8445 Vineet Gupta 2013-01-18 281 } 41195d236e8445 Vineet Gupta 2013-01-18 282 :::::: The code at line 267 was first introduced by commit :::::: d8e8c7dda11f5d5cf90495f2e89d917a83509bc0 ARC: [SMP] optimize IPI send and receive :::::: TO: Vineet Gupta <vgu...@synopsys.com> :::::: CC: Vineet Gupta <vgu...@synopsys.com> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc
