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SubjectRe: [PATCH 1/2] sched: Introduce new flags to sched_setaffinity to support soft affinity.
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, &current->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>

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation

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