Re: [PATCH 4/4] rcu: Fix dyntick-idle tracing

kbuild test robot
2017-04-07T04:50:46Z

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Hi Paul,

[auto build test ERROR on tip/perf/core]
[also build test ERROR on v4.11-rc5 next-20170406]
[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/Steven-Rostedt/tracing-Add-usecase-of-synchronize_rcu_tasks-and-stack_tracer_disable/20170407-122352
config: x86_64-randconfig-x009-201714 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64

All errors (new ones prefixed by >>):

kernel/rcu/tree.c: In function 'rcu_eqs_enter_common':
>> kernel/rcu/tree.c:806:2: error: implicit declaration of function 'stack_tracer_enable' [-Werror=implicit-function-declaration]
stack_tracer_enable();
^~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors

vim +/stack_tracer_enable +806 kernel/rcu/tree.c

800 do_nocb_deferred_wakeup(rdp);
801 }
802 rcu_prepare_for_idle();
803 stack_tracer_disable();
804 rdtp->dynticks_nesting = 0; /* Breaks tracing momentarily. */
805 rcu_dynticks_eqs_enter(); /* After this, tracing works again. */
> 806 stack_tracer_enable();
807 rcu_dynticks_task_enter();
808
809 /*

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