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Date: Mon, 19 Feb 2018 02:45:27 +0800
From: kbuild test robot <lkp@...el.com>
To: Juergen Gross <jgross@...e.com>
Cc: kbuild-all@...org, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, xen-devel@...ts.xenproject.org,
akpm@...ux-foundation.org, mhocko@...e.com,
Juergen Gross <jgross@...e.com>, stable@...r.kernel.org
Subject: Re: [PATCH] mm: don't defer struct page initialization for Xen pv
guests
Hi Juergen,
I love your patch! Yet something to improve:
[auto build test ERROR on mmotm/master]
[also build test ERROR on v4.16-rc1 next-20180216]
[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/Juergen-Gross/mm-don-t-defer-struct-page-initialization-for-Xen-pv-guests/20180218-233657
base: git://git.cmpxchg.org/linux-mmotm.git master
config: i386-randconfig-x010-201807 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=i386
All errors (new ones prefixed by >>):
mm/page_alloc.c: In function 'update_defer_init':
>> mm/page_alloc.c:352:6: error: implicit declaration of function 'xen_pv_domain' [-Werror=implicit-function-declaration]
if (xen_pv_domain())
^~~~~~~~~~~~~
Cyclomatic Complexity 5 include/linux/compiler.h:__read_once_size
Cyclomatic Complexity 5 include/linux/compiler.h:__write_once_size
Cyclomatic Complexity 2 arch/x86/include/asm/bitops.h:set_bit
Cyclomatic Complexity 1 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:__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:__ffs
Cyclomatic Complexity 1 arch/x86/include/asm/bitops.h:fls
Cyclomatic Complexity 1 arch/x86/include/asm/arch_hweight.h:__arch_hweight32
Cyclomatic Complexity 2 include/linux/bitops.h:hweight_long
Cyclomatic Complexity 1 include/linux/bitops.h:fls_long
Cyclomatic Complexity 1 include/linux/log2.h:__ilog2_u32
Cyclomatic Complexity 3 include/linux/log2.h:is_power_of_2
Cyclomatic Complexity 1 include/linux/log2.h:__roundup_pow_of_two
Cyclomatic Complexity 1 include/linux/log2.h:__rounddown_pow_of_two
Cyclomatic Complexity 1 include/linux/list.h:INIT_LIST_HEAD
Cyclomatic Complexity 1 include/linux/list.h:__list_del
Cyclomatic Complexity 1 include/linux/list.h:list_empty
Cyclomatic Complexity 1 arch/x86/include/asm/current.h:get_current
Cyclomatic Complexity 3 include/linux/string.h:memset
Cyclomatic Complexity 1 arch/x86/include/asm/page_32.h:clear_page
Cyclomatic Complexity 1 include/asm-generic/getorder.h:__get_order
Cyclomatic Complexity 3 include/linux/bitmap.h:bitmap_weight
Cyclomatic Complexity 1 arch/x86/include/asm/atomic.h:atomic_read
Cyclomatic Complexity 1 arch/x86/include/asm/atomic.h:atomic_set
Cyclomatic Complexity 1 arch/x86/include/asm/atomic.h:atomic_add
Cyclomatic Complexity 1 arch/x86/include/asm/atomic.h:atomic_sub_and_test
Cyclomatic Complexity 1 arch/x86/include/asm/atomic.h:atomic_dec_and_test
Cyclomatic Complexity 1 include/asm-generic/atomic-long.h:atomic_long_read
Cyclomatic Complexity 1 include/linux/jump_label.h:static_key_count
Cyclomatic Complexity 2 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/err.h:PTR_ERR
Cyclomatic Complexity 1 arch/x86/include/asm/processor.h:rep_nop
Cyclomatic Complexity 1 arch/x86/include/asm/processor.h:cpu_relax
Cyclomatic Complexity 1 arch/x86/include/asm/processor.h:prefetchw
Cyclomatic Complexity 1 arch/x86/include/asm/preempt.h:preempt_count
Cyclomatic Complexity 5 arch/x86/include/asm/preempt.h:__preempt_count_add
Cyclomatic Complexity 1 arch/x86/include/asm/preempt.h:__preempt_count_dec_and_test
Cyclomatic Complexity 1 arch/x86/include/asm/preempt.h:should_resched
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_unlock
Cyclomatic Complexity 1 include/linux/spinlock.h:spin_unlock_irqrestore
Cyclomatic Complexity 1 include/linux/nodemask.h:__nodemask_pr_numnodes
Cyclomatic Complexity 2 include/linux/nodemask.h:__nodemask_pr_bits
Cyclomatic Complexity 1 include/linux/nodemask.h:__nodes_weight
Cyclomatic Complexity 1 include/linux/nodemask.h:node_state
Cyclomatic Complexity 1 include/linux/nodemask.h:node_set_state
Cyclomatic Complexity 1 include/linux/nodemask.h:num_node_state
Cyclomatic Complexity 1 include/linux/mmzone.h:zone_end_pfn
Cyclomatic Complexity 3 include/linux/mmzone.h:zone_spans_pfn
Cyclomatic Complexity 1 include/linux/mmzone.h:zone_is_initialized
Cyclomatic Complexity 1 include/linux/mmzone.h:node_lruvec
Cyclomatic Complexity 1 include/linux/mmzone.h:pgdat_end_pfn
Cyclomatic Complexity 1 include/linux/rcupdate.h:rcu_read_lock_sched_notrace
Cyclomatic Complexity 1 include/linux/debugobjects.h:debug_check_no_obj_freed
Cyclomatic Complexity 1 include/linux/workqueue.h:__init_work
Cyclomatic Complexity 1 include/linux/memory_hotplug.h:pgdat_resize_init
Cyclomatic Complexity 1 include/linux/memory_hotplug.h:zone_span_seqbegin
Cyclomatic Complexity 1 include/linux/memory_hotplug.h:zone_span_seqretry
Cyclomatic Complexity 1 include/linux/memory_hotplug.h:zone_seqlock_init
Cyclomatic Complexity 1 include/linux/memory_hotplug.h:movable_node_is_enabled
Cyclomatic Complexity 1 include/linux/mmzone.h:managed_zone
Cyclomatic Complexity 1 include/linux/mmzone.h:populated_zone
Cyclomatic Complexity 1 include/linux/mmzone.h:is_highmem_idx
Cyclomatic Complexity 1 include/linux/mmzone.h:is_highmem
Cyclomatic Complexity 1 include/linux/mmzone.h:zonelist_zone
Cyclomatic Complexity 1 include/linux/mmzone.h:zonelist_zone_idx
Cyclomatic Complexity 3 include/linux/mmzone.h:next_zones_zonelist
Cyclomatic Complexity 1 include/linux/mmzone.h:first_zones_zonelist
Cyclomatic Complexity 1 include/linux/mmzone.h:pfn_to_section_nr
Cyclomatic Complexity 2 include/linux/mmzone.h:__nr_to_section
Cyclomatic Complexity 1 include/linux/mmzone.h:__section_mem_map_addr
Cyclomatic Complexity 3 include/linux/mmzone.h:valid_section
Cyclomatic Complexity 1 include/linux/mmzone.h:__pfn_to_section
Cyclomatic Complexity 2 include/linux/mmzone.h:pfn_valid
Cyclomatic Complexity 1 arch/x86/include/asm/topology.h:numa_node_id
Cyclomatic Complexity 1 include/linux/topology.h:numa_mem_id
Cyclomatic Complexity 1 include/linux/gfp.h:gfp_zonelist
Cyclomatic Complexity 1 include/linux/gfp.h:node_zonelist
Cyclomatic Complexity 1 include/linux/gfp.h:arch_free_page
Cyclomatic Complexity 1 include/linux/gfp.h:arch_alloc_page
Cyclomatic Complexity 1 include/linux/gfp.h:pm_suspended_storage
Cyclomatic Complexity 1 include/linux/page-flags.h:PageTail
Cyclomatic Complexity 3 include/linux/page-flags.h:PageCompound
Cyclomatic Complexity 1 include/linux/page-flags.h:PageLRU
Cyclomatic Complexity 1 include/linux/page-flags.h:PageReserved
Cyclomatic Complexity 1 include/linux/page-flags.h:SetPageReserved
Cyclomatic Complexity 1 include/linux/page-flags.h:ClearPageReserved
Cyclomatic Complexity 1 include/linux/page-flags.h:__ClearPageReserved
Cyclomatic Complexity 1 include/linux/page-flags.h:PageHighMem
Cyclomatic Complexity 1 include/linux/page-flags.h:PageHWPoison
vim +/xen_pv_domain +352 mm/page_alloc.c
339
340 /*
341 * Returns false when the remaining initialisation should be deferred until
342 * later in the boot cycle when it can be parallelised.
343 */
344 static inline bool update_defer_init(pg_data_t *pgdat,
345 unsigned long pfn, unsigned long zone_end,
346 unsigned long *nr_initialised)
347 {
348 /* Always populate low zones for address-constrained allocations */
349 if (zone_end < pgdat_end_pfn(pgdat))
350 return true;
351 /* Xen PV domains need page structures early */
> 352 if (xen_pv_domain())
353 return true;
354 (*nr_initialised)++;
355 if ((*nr_initialised > pgdat->static_init_pgcnt) &&
356 (pfn & (PAGES_PER_SECTION - 1)) == 0) {
357 pgdat->first_deferred_pfn = pfn;
358 return false;
359 }
360
361 return true;
362 }
363 #else
364 static inline void reset_deferred_meminit(pg_data_t *pgdat)
365 {
366 }
367
---
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