Messages in this thread |  | | Date | Thu, 21 Sep 2017 18:38:19 +0800 | From | kbuild test robot <> | Subject | Re: [PATCH 1/2] sched: Introduce new flags to sched_setaffinity to support soft affinity. |
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Hi Rohit,
[auto build test WARNING on tip/sched/core] [also build test WARNING on v4.14-rc1 next-20170921] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Rohit-Jain/sched-Introduce-new-flags-to-sched_setaffinity-to-support-soft-affinity/20170921-140313 reproduce: # apt-get install sparse make ARCH=x86_64 allmodconfig make C=1 CF=-D__CHECK_ENDIAN__
sparse warnings: (new ones prefixed by >>)
vim +299 kernel/trace/trace_hwlat.c
0330f7aa Steven Rostedt (Red Hat 2016-07-15 269) f447c196 Steven Rostedt (VMware 2017-01-31 270) static void move_to_next_cpu(void) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 271) { f447c196 Steven Rostedt (VMware 2017-01-31 272) struct cpumask *current_mask = &save_cpumask; 0330f7aa Steven Rostedt (Red Hat 2016-07-15 273) int next_cpu; 0330f7aa Steven Rostedt (Red Hat 2016-07-15 274) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 275) if (disable_migrate) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 276) return; 0330f7aa Steven Rostedt (Red Hat 2016-07-15 277) /* 0330f7aa Steven Rostedt (Red Hat 2016-07-15 278) * If for some reason the user modifies the CPU affinity 0330f7aa Steven Rostedt (Red Hat 2016-07-15 279) * of this thread, than stop migrating for the duration 0330f7aa Steven Rostedt (Red Hat 2016-07-15 280) * of the current test. 0330f7aa Steven Rostedt (Red Hat 2016-07-15 281) */ 0330f7aa Steven Rostedt (Red Hat 2016-07-15 282) if (!cpumask_equal(current_mask, ¤t->cpus_allowed)) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 283) goto disable; 0330f7aa Steven Rostedt (Red Hat 2016-07-15 284) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 285) get_online_cpus(); 0330f7aa Steven Rostedt (Red Hat 2016-07-15 286) cpumask_and(current_mask, cpu_online_mask, tracing_buffer_mask); 0330f7aa Steven Rostedt (Red Hat 2016-07-15 287) next_cpu = cpumask_next(smp_processor_id(), current_mask); 0330f7aa Steven Rostedt (Red Hat 2016-07-15 288) put_online_cpus(); 0330f7aa Steven Rostedt (Red Hat 2016-07-15 289) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 290) if (next_cpu >= nr_cpu_ids) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 291) next_cpu = cpumask_first(current_mask); 0330f7aa Steven Rostedt (Red Hat 2016-07-15 292) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 293) if (next_cpu >= nr_cpu_ids) /* Shouldn't happen! */ 0330f7aa Steven Rostedt (Red Hat 2016-07-15 294) goto disable; 0330f7aa Steven Rostedt (Red Hat 2016-07-15 295) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 296) cpumask_clear(current_mask); 0330f7aa Steven Rostedt (Red Hat 2016-07-15 297) cpumask_set_cpu(next_cpu, current_mask); 0330f7aa Steven Rostedt (Red Hat 2016-07-15 298) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 @299) sched_setaffinity(0, current_mask); 0330f7aa Steven Rostedt (Red Hat 2016-07-15 300) return; 0330f7aa Steven Rostedt (Red Hat 2016-07-15 301) 0330f7aa Steven Rostedt (Red Hat 2016-07-15 302) disable: 0330f7aa Steven Rostedt (Red Hat 2016-07-15 303) disable_migrate = true; 0330f7aa Steven Rostedt (Red Hat 2016-07-15 304) } 0330f7aa Steven Rostedt (Red Hat 2016-07-15 305)
:::::: The code at line 299 was first introduced by commit :::::: 0330f7aa8ee63d0c435c0cb4e47ea06235ee4b7f tracing: Have hwlat trace migrate across tracing_cpumask CPUs
:::::: TO: Steven Rostedt (Red Hat) <rostedt@goodmis.org> :::::: CC: Steven Rostedt <rostedt@goodmis.org>
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