Hi Josef,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.8-rc1 next-20160809]
[cannot apply to linux/master]
[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/Josef-Bacik/Provide-accounting-for-dirty-metadata/20160810-031219
config: x86_64-randconfig-x013-201632 (attached as .config)
compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   mm/page-writeback.c: In function 'balance_dirty_pages_ratelimited':

quoted

mm/page-writeback.c:1873:6: error: implicit declaration of function 'bdi_cgwb_enabled' [-Werror=implicit-function-declaration]

     if (bdi_cgwb_enabled(bdi, sb))
         ^~~~~~~~~~~~~~~~
   Cyclomatic Complexity 5 include/linux/compiler.h:__read_once_size
   Cyclomatic Complexity 2 arch/x86/include/asm/bitops.h:set_bit
   Cyclomatic Complexity 2 arch/x86/include/asm/bitops.h:clear_bit
   Cyclomatic Complexity 1 arch/x86/include/asm/bitops.h:test_and_set_bit
   Cyclomatic Complexity 1 arch/x86/include/asm/bitops.h:test_and_set_bit_lock
   Cyclomatic Complexity 1 arch/x86/include/asm/bitops.h:test_and_clear_bit
   Cyclomatic Complexity 1 arch/x86/include/asm/bitops.h:constant_test_bit
   Cyclomatic Complexity 1 arch/x86/include/asm/bitops.h:variable_test_bit
   Cyclomatic Complexity 1 arch/x86/include/asm/bitops.h:fls64
   Cyclomatic Complexity 1 include/linux/log2.h:__ilog2_u64
   Cyclomatic Complexity 1 arch/x86/include/asm/current.h:get_current
   Cyclomatic Complexity 1 arch/x86/include/asm/atomic.h:atomic_inc
   Cyclomatic Complexity 1 arch/x86/include/asm/atomic.h:atomic_dec_and_test
   Cyclomatic Complexity 1 arch/x86/include/asm/atomic64_64.h:atomic64_read
   Cyclomatic Complexity 1 arch/x86/include/asm/atomic64_64.h:atomic64_inc
   Cyclomatic Complexity 1 arch/x86/include/asm/atomic64_64.h:atomic64_dec
   Cyclomatic Complexity 1 arch/x86/include/asm/atomic64_64.h:atomic64_add_return
   Cyclomatic Complexity 1 include/asm-generic/atomic-long.h:atomic_long_read
   Cyclomatic Complexity 1 include/asm-generic/atomic-long.h:atomic_long_add_return
   Cyclomatic Complexity 1 include/asm-generic/atomic-long.h:atomic_long_inc
   Cyclomatic Complexity 1 include/asm-generic/atomic-long.h:atomic_long_dec
   Cyclomatic Complexity 2 arch/x86/include/asm/jump_label.h:arch_static_branch
   Cyclomatic Complexity 1 include/linux/jump_label.h:static_key_false
   Cyclomatic Complexity 1 arch/x86/include/asm/paravirt.h:arch_local_save_flags
   Cyclomatic Complexity 1 arch/x86/include/asm/paravirt.h:arch_local_irq_restore
   Cyclomatic Complexity 1 arch/x86/include/asm/paravirt.h:arch_local_irq_disable
   Cyclomatic Complexity 1 arch/x86/include/asm/paravirt.h:arch_local_irq_save
   Cyclomatic Complexity 1 include/linux/math64.h:div_u64_rem
   Cyclomatic Complexity 1 include/linux/math64.h:div64_u64
   Cyclomatic Complexity 1 include/linux/math64.h:div64_s64
   Cyclomatic Complexity 1 include/linux/math64.h:div_u64
   Cyclomatic Complexity 1 arch/x86/include/asm/irqflags.h:arch_irqs_disabled_flags
   Cyclomatic Complexity 2 include/linux/thread_info.h:test_ti_thread_flag
   Cyclomatic Complexity 5 arch/x86/include/asm/preempt.h:__preempt_count_add
   Cyclomatic Complexity 5 arch/x86/include/asm/preempt.h:__preempt_count_sub
   Cyclomatic Complexity 1 include/linux/spinlock.h:spinlock_check
   Cyclomatic Complexity 1 include/linux/spinlock.h:spin_lock
   Cyclomatic Complexity 1 include/linux/spinlock.h:spin_lock_bh
   Cyclomatic Complexity 1 include/linux/spinlock.h:spin_lock_irq
   Cyclomatic Complexity 1 include/linux/spinlock.h:spin_unlock
   Cyclomatic Complexity 1 include/linux/spinlock.h:spin_unlock_bh
   Cyclomatic Complexity 1 include/linux/spinlock.h:spin_unlock_irq
   Cyclomatic Complexity 1 include/linux/spinlock.h:spin_unlock_irqrestore
   Cyclomatic Complexity 1 include/linux/rcupdate.h:rcu_read_lock_sched_notrace
   Cyclomatic Complexity 1 include/linux/rcupdate.h:rcu_read_unlock_sched_notrace
   Cyclomatic Complexity 1 include/linux/mmzone.h:populated_zone
   Cyclomatic Complexity 1 include/linux/percpu_counter.h:percpu_counter_add
   Cyclomatic Complexity 1 include/linux/percpu_counter.h:__percpu_counter_add
   Cyclomatic Complexity 1 include/linux/percpu_counter.h:percpu_counter_read
   Cyclomatic Complexity 1 include/linux/percpu_counter.h:percpu_counter_read_positive
   Cyclomatic Complexity 1 include/linux/percpu_counter.h:percpu_counter_sum_positive
   Cyclomatic Complexity 3 include/linux/page-flags.h:compound_head
   Cyclomatic Complexity 1 include/linux/page-flags.h:PageLocked
   Cyclomatic Complexity 1 include/linux/page-flags.h:PageError
   Cyclomatic Complexity 1 include/linux/page-flags.h:PageDirty
   Cyclomatic Complexity 1 include/linux/page-flags.h:ClearPageDirty
   Cyclomatic Complexity 1 include/linux/page-flags.h:TestSetPageDirty
   Cyclomatic Complexity 1 include/linux/page-flags.h:TestClearPageDirty
   Cyclomatic Complexity 1 include/linux/page-flags.h:PagePrivate
   Cyclomatic Complexity 1 include/linux/page-flags.h:PageWriteback
   Cyclomatic Complexity 1 include/linux/page-flags.h:TestSetPageWriteback
   Cyclomatic Complexity 1 include/linux/page-flags.h:TestClearPageWriteback
   Cyclomatic Complexity 1 include/linux/page-flags.h:PageReclaim
   Cyclomatic Complexity 1 include/linux/page-flags.h:ClearPageReclaim
   Cyclomatic Complexity 1 include/linux/page-flags.h:PageSwapCache
   Cyclomatic Complexity 2 include/linux/page-flags.h:PageUptodate
   Cyclomatic Complexity 2 include/linux/page_ref.h:page_ref_inc
   Cyclomatic Complexity 2 include/linux/page_ref.h:page_ref_dec_and_test
   Cyclomatic Complexity 1 include/linux/mm.h:put_page_testzero
   Cyclomatic Complexity 1 include/linux/mm.h:page_zonenum
   Cyclomatic Complexity 1 include/linux/mm.h:get_zone_device_page
   Cyclomatic Complexity 1 include/linux/mm.h:put_zone_device_page
   Cyclomatic Complexity 1 include/linux/mm.h:is_zone_device_page
   Cyclomatic Complexity 2 include/linux/mm.h:get_page
   Cyclomatic Complexity 3 include/linux/mm.h:put_page
   Cyclomatic Complexity 1 include/linux/mm.h:page_zone
   Cyclomatic Complexity 1 include/linux/mm.h:page_pgdat
   Cyclomatic Complexity 1 include/linux/vmstat.h:global_page_state
   Cyclomatic Complexity 1 include/linux/vmstat.h:global_node_page_state
   Cyclomatic Complexity 1 include/linux/vmstat.h:zone_page_state
   Cyclomatic Complexity 1 include/linux/vmstat.h:__inc_zone_state
   Cyclomatic Complexity 1 include/linux/vmstat.h:__inc_node_state
   Cyclomatic Complexity 1 include/linux/vmstat.h:__dec_zone_state
   Cyclomatic Complexity 1 include/linux/vmstat.h:__dec_node_state
   Cyclomatic Complexity 1 include/linux/vmstat.h:__inc_zone_page_state
   Cyclomatic Complexity 1 include/linux/vmstat.h:__inc_node_page_state
   Cyclomatic Complexity 1 include/linux/vmstat.h:__dec_zone_page_state
   Cyclomatic Complexity 1 include/linux/vmstat.h:__dec_node_page_state
   Cyclomatic Complexity 2 include/linux/mm.h:page_index
   Cyclomatic Complexity 1 include/linux/signal.h:sigismember
   Cyclomatic Complexity 1 include/linux/sched.h:test_tsk_thread_flag
   Cyclomatic Complexity 1 include/linux/sched.h:signal_pending
   Cyclomatic Complexity 1 include/linux/sched.h:__fatal_signal_pending
   Cyclomatic Complexity 3 include/linux/sched.h:fatal_signal_pending
   Cyclomatic Complexity 1 include/linux/backing-dev-defs.h:wb_put
   Cyclomatic Complexity 1 include/linux/writeback.h:inode_attach_wb
   Cyclomatic Complexity 1 include/linux/memcontrol.h:lock_page_memcg
   Cyclomatic Complexity 1 include/linux/memcontrol.h:unlock_page_memcg

vim +/bdi_cgwb_enabled +1873 mm/page-writeback.c

  1867		int ratelimit;
  1868		int *p;
  1869	
  1870		if (!bdi_cap_account_dirty(bdi))
  1871			return;
  1872	

1873		if (bdi_cgwb_enabled(bdi, sb))

  1874			wb = wb_get_create_current(bdi, GFP_KERNEL);
  1875		if (!wb)
  1876			wb = &bdi->wb;

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