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* kernel/rcu/tree.c:3026:1: warning: the frame size of 1040 bytes is larger than 1024 bytes
@ 2016-10-28 11:33 kbuild test robot
  0 siblings, 0 replies; only message in thread
From: kbuild test robot @ 2016-10-28 11:33 UTC (permalink / raw)
  To: Emese Revfy; +Cc: kbuild-all, linux-kernel, Kees Cook

[-- Attachment #1: Type: text/plain, Size: 10172 bytes --]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   14970f204b1993af7459d5bd34aaff38dfee6670
commit: 0766f788eb727e2e330d55d30545db65bcf2623f latent_entropy: Mark functions with __latent_entropy
date:   3 weeks ago
config: i386-randconfig-b0-10281653 (attached as .config)
compiler: gcc-5 (Debian 5.4.1-2) 5.4.1 20160904
reproduce:
        git checkout 0766f788eb727e2e330d55d30545db65bcf2623f
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   Cyclomatic Complexity 8 kernel/rcu/tree.c:rcu_report_unblock_qs_rnp
   Cyclomatic Complexity 11 kernel/rcu/tree.c:rcu_report_qs_rdp
   Cyclomatic Complexity 13 kernel/rcu/tree_plugin.h:invoke_rcu_callbacks_kthread
   Cyclomatic Complexity 25 kernel/rcu/tree.c:rcu_boot_init_percpu_data
   Cyclomatic Complexity 14 kernel/rcu/tree_exp.h:sync_exp_reset_tree
   Cyclomatic Complexity 9 kernel/rcu/tree.c:note_gp_changes
   Cyclomatic Complexity 6 kernel/rcu/tree.c:rcu_check_quiescent_state
   Cyclomatic Complexity 2 kernel/rcu/tree.c:show_rcu_gp_kthreads
   Cyclomatic Complexity 1 kernel/rcu/tree_plugin.h:print_cpu_stall_info_begin
   Cyclomatic Complexity 3 kernel/rcu/tree_plugin.h:print_cpu_stall_info
   Cyclomatic Complexity 1 kernel/rcu/tree_plugin.h:print_cpu_stall_info_end
   Cyclomatic Complexity 7 kernel/rcu/tree_plugin.h:rcu_bootup_announce_oddness
   Cyclomatic Complexity 1 kernel/rcu/tree_plugin.h:rcu_bootup_announce
   Cyclomatic Complexity 27 kernel/rcu/tree.c:rcu_init_geometry
   Cyclomatic Complexity 4 kernel/rcu/tree.c:rcu_dump_rcu_node_tree
   Cyclomatic Complexity 31 kernel/rcu/tree.c:rcu_eqs_exit_common
   Cyclomatic Complexity 15 kernel/rcu/tree.c:rcu_eqs_exit
   Cyclomatic Complexity 15 kernel/rcu/tree.c:rcu_cleanup_dead_cpu
   Cyclomatic Complexity 44 kernel/rcu/tree.c:rcu_eqs_enter_common
   Cyclomatic Complexity 15 kernel/rcu/tree.c:rcu_eqs_enter
   Cyclomatic Complexity 23 kernel/rcu/tree.c:rcu_stall_kick_kthreads
   Cyclomatic Complexity 1 kernel/rcu/tree.c:record_gp_stall_check_time
   Cyclomatic Complexity 5 kernel/rcu/tree_exp.h:sync_sched_exp_handler
   Cyclomatic Complexity 18 kernel/rcu/tree.c:rcu_implicit_dynticks_qs
   Cyclomatic Complexity 6 kernel/rcu/tree.c:rcu_check_gp_kthread_starvation
   Cyclomatic Complexity 7 kernel/rcu/tree.c:rcu_dump_cpu_stacks
   Cyclomatic Complexity 5 kernel/rcu/tree.c:print_cpu_stall
   Cyclomatic Complexity 18 kernel/rcu/tree.c:print_other_cpu_stall
   Cyclomatic Complexity 22 kernel/rcu/tree.c:check_cpu_stall
   Cyclomatic Complexity 18 kernel/rcu/tree.c:__rcu_pending
   Cyclomatic Complexity 3 kernel/rcu/tree.c:rcu_pending
   Cyclomatic Complexity 2 kernel/rcu/tree.c:invoke_rcu_core
   Cyclomatic Complexity 62 kernel/rcu/tree.c:rcu_do_batch
   Cyclomatic Complexity 4 kernel/rcu/tree.c:invoke_rcu_callbacks
   Cyclomatic Complexity 18 kernel/rcu/tree.c:__rcu_process_callbacks
   Cyclomatic Complexity 3 kernel/rcu/tree.c:rcu_process_callbacks
   Cyclomatic Complexity 9 kernel/rcu/tree.c:synchronize_rcu_bh
   Cyclomatic Complexity 3 kernel/rcu/tree.c:get_state_synchronize_rcu
   Cyclomatic Complexity 5 kernel/rcu/tree.c:cond_synchronize_rcu
   Cyclomatic Complexity 3 kernel/rcu/tree.c:get_state_synchronize_sched
   Cyclomatic Complexity 14 kernel/rcu/tree_exp.h:sync_sched_exp_online_cleanup
   Cyclomatic Complexity 2 kernel/rcu/tree.c:rcu_barrier_callback
   Cyclomatic Complexity 10 kernel/rcu/tree.c:rcu_spawn_gp_kthread
   Cyclomatic Complexity 28 kernel/rcu/tree_exp.h:synchronize_sched_expedited_wait
   Cyclomatic Complexity 9 kernel/rcu/tree.c:rcu_gp_slow
   Cyclomatic Complexity 22 kernel/rcu/tree_exp.h:sync_rcu_exp_select_cpus
   Cyclomatic Complexity 14 kernel/rcu/tree.c:rcu_init_one
   Cyclomatic Complexity 7 kernel/rcu/tree.c:rcu_pm_notify
   Cyclomatic Complexity 13 kernel/rcu/tree_exp.h:exp_funnel_lock
   Cyclomatic Complexity 5 kernel/rcu/tree_exp.h:rcu_exp_wait_wake
   Cyclomatic Complexity 4 kernel/rcu/tree_exp.h:synchronize_sched_expedited
   Cyclomatic Complexity 9 kernel/rcu/tree.c:synchronize_sched
   Cyclomatic Complexity 5 kernel/rcu/tree.c:cond_synchronize_sched
   Cyclomatic Complexity 1 kernel/rcu/tree_exp.h:synchronize_rcu_expedited
   Cyclomatic Complexity 1 kernel/rcu/tree.c:rcu_rnp_online_cpus
   Cyclomatic Complexity 3 kernel/rcu/tree.c:rcu_sched_qs
   Cyclomatic Complexity 2 kernel/rcu/tree.c:rcu_bh_qs
   Cyclomatic Complexity 2 kernel/rcu/tree.c:rcu_note_context_switch
   Cyclomatic Complexity 4 kernel/rcu/tree.c:rcu_all_qs
   Cyclomatic Complexity 53 kernel/rcu/tree.c:rcu_gp_init
   Cyclomatic Complexity 24 kernel/rcu/tree.c:force_qs_rnp
   Cyclomatic Complexity 5 kernel/rcu/tree.c:rcu_gp_fqs
   Cyclomatic Complexity 39 kernel/rcu/tree.c:rcu_gp_cleanup
   Cyclomatic Complexity 44 kernel/rcu/tree.c:rcu_gp_kthread
   Cyclomatic Complexity 1 kernel/rcu/tree.c:rcu_exp_batches_completed
   Cyclomatic Complexity 1 kernel/rcu/tree.c:rcu_exp_batches_completed_sched
   Cyclomatic Complexity 2 kernel/rcu/tree.c:rcu_idle_enter
   Cyclomatic Complexity 19 kernel/rcu/tree.c:rcu_irq_exit
   Cyclomatic Complexity 2 kernel/rcu/tree.c:rcu_irq_exit_irqson
   Cyclomatic Complexity 2 kernel/rcu/tree.c:rcu_idle_exit
   Cyclomatic Complexity 19 kernel/rcu/tree.c:rcu_irq_enter
   Cyclomatic Complexity 2 kernel/rcu/tree.c:rcu_irq_enter_irqson
   Cyclomatic Complexity 26 kernel/rcu/tree.c:rcu_nmi_enter
   Cyclomatic Complexity 39 kernel/rcu/tree.c:rcu_nmi_exit
   Cyclomatic Complexity 1 kernel/rcu/tree.c:__rcu_is_watching
   Cyclomatic Complexity 1 kernel/rcu/tree.c:rcu_is_watching
   Cyclomatic Complexity 18 kernel/rcu/tree.c:__call_rcu_core
   Cyclomatic Complexity 66 kernel/rcu/tree.c:__call_rcu
   Cyclomatic Complexity 1 kernel/rcu/tree.c:call_rcu_sched
   Cyclomatic Complexity 1 kernel/rcu/tree.c:call_rcu_bh
   Cyclomatic Complexity 1 kernel/rcu/tree.c:kfree_call_rcu
   Cyclomatic Complexity 10 kernel/rcu/tree.c:_rcu_barrier
   Cyclomatic Complexity 1 kernel/rcu/tree.c:rcu_barrier_bh
   Cyclomatic Complexity 1 kernel/rcu/tree.c:rcu_barrier_sched
   Cyclomatic Complexity 1 kernel/rcu/tree_plugin.h:rcu_barrier
   Cyclomatic Complexity 4 kernel/rcu/tree.c:rcu_lockdep_current_cpu_online
   Cyclomatic Complexity 2 kernel/rcu/tree.c:rcu_cpu_stall_reset
   Cyclomatic Complexity 9 kernel/rcu/tree.c:rcu_check_callbacks
   Cyclomatic Complexity 2 kernel/rcu/tree.c:rcutree_prepare_cpu
   Cyclomatic Complexity 1 kernel/rcu/tree.c:rcutree_online_cpu
   Cyclomatic Complexity 1 kernel/rcu/tree.c:rcutree_offline_cpu
   Cyclomatic Complexity 2 kernel/rcu/tree.c:rcutree_dying_cpu
   Cyclomatic Complexity 2 kernel/rcu/tree.c:rcutree_dead_cpu
   Cyclomatic Complexity 2 kernel/rcu/tree.c:rcu_report_dead
   Cyclomatic Complexity 7 kernel/rcu/tree.c:rcu_scheduler_starting
   Cyclomatic Complexity 4 kernel/rcu/tree.c:rcu_init
   Cyclomatic Complexity 1 kernel/rcu/tree_plugin.h:exit_rcu
   Cyclomatic Complexity 1 kernel/rcu/tree_plugin.h:rcu_needs_cpu
   Cyclomatic Complexity 1 kernel/rcu/tree.c:_GLOBAL__sub_I_65535_0_rcu_sched_state
   kernel/rcu/tree.c: In function 'rcu_process_callbacks':
>> kernel/rcu/tree.c:3026:1: warning: the frame size of 1040 bytes is larger than 1024 bytes [-Wframe-larger-than=]
    }
    ^

vim +3026 kernel/rcu/tree.c

96d3fd0d kernel/rcu/tree.c Paul E. McKenney         2013-10-04  3010  	do_nocb_deferred_wakeup(rdp);
09223371 kernel/rcutree.c  Shaohua Li               2011-06-14  3011  }
09223371 kernel/rcutree.c  Shaohua Li               2011-06-14  3012  
64db4cff kernel/rcutree.c  Paul E. McKenney         2008-12-18  3013  /*
e0f23060 kernel/rcutree.c  Paul E. McKenney         2011-06-21  3014   * Do RCU core processing for the current CPU.
64db4cff kernel/rcutree.c  Paul E. McKenney         2008-12-18  3015   */
0766f788 kernel/rcu/tree.c Emese Revfy              2016-06-20  3016  static __latent_entropy void rcu_process_callbacks(struct softirq_action *unused)
64db4cff kernel/rcutree.c  Paul E. McKenney         2008-12-18  3017  {
6ce75a23 kernel/rcutree.c  Paul E. McKenney         2012-06-12  3018  	struct rcu_state *rsp;
6ce75a23 kernel/rcutree.c  Paul E. McKenney         2012-06-12  3019  
bfa00b4c kernel/rcutree.c  Paul E. McKenney         2012-06-21  3020  	if (cpu_is_offline(smp_processor_id()))
bfa00b4c kernel/rcutree.c  Paul E. McKenney         2012-06-21  3021  		return;
f7f7bac9 kernel/rcutree.c  Steven Rostedt (Red Hat  2013-07-12  3022) 	trace_rcu_utilization(TPS("Start RCU core"));
6ce75a23 kernel/rcutree.c  Paul E. McKenney         2012-06-12  3023  	for_each_rcu_flavor(rsp)
6ce75a23 kernel/rcutree.c  Paul E. McKenney         2012-06-12  3024  		__rcu_process_callbacks(rsp);
f7f7bac9 kernel/rcutree.c  Steven Rostedt (Red Hat  2013-07-12  3025) 	trace_rcu_utilization(TPS("End RCU core"));
64db4cff kernel/rcutree.c  Paul E. McKenney         2008-12-18 @3026  }
64db4cff kernel/rcutree.c  Paul E. McKenney         2008-12-18  3027  
a26ac245 kernel/rcutree.c  Paul E. McKenney         2011-01-12  3028  /*
e0f23060 kernel/rcutree.c  Paul E. McKenney         2011-06-21  3029   * Schedule RCU callback invocation.  If the specified type of RCU
e0f23060 kernel/rcutree.c  Paul E. McKenney         2011-06-21  3030   * does not support RCU priority boosting, just do a direct call,
e0f23060 kernel/rcutree.c  Paul E. McKenney         2011-06-21  3031   * otherwise wake up the per-CPU kernel kthread.  Note that because we
924df8a0 kernel/rcu/tree.c Paul E. McKenney         2014-10-29  3032   * are running on the current CPU with softirqs disabled, the
e0f23060 kernel/rcutree.c  Paul E. McKenney         2011-06-21  3033   * rcu_cpu_kthread_task cannot disappear out from under us.
a26ac245 kernel/rcutree.c  Paul E. McKenney         2011-01-12  3034   */

:::::: The code at line 3026 was first introduced by commit
:::::: 64db4cfff99c04cd5f550357edcc8780f96b54a2 "Tree RCU": scalable classic RCU implementation

:::::: TO: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
:::::: CC: Ingo Molnar <mingo@elte.hu>

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

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