tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.4.y head: 56cfa226aa2348915cd4ced0b72542dc35ca2467 commit: df82285ab4b974f2040f31dbabdd11e055a282c2 [9983/9999] mm, meminit: recalculate pcpu batch and high limits after init completes config: i386-defconfig (attached as .config) compiler: gcc-7 (Debian 7.4.0-14) 7.4.0 reproduce: git checkout df82285ab4b974f2040f31dbabdd11e055a282c2 # save the attached .config to linux build tree make ARCH=i386 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): mm/page_alloc.c: In function 'drain_all_pages': >> mm/page_alloc.c:2024:2: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement] static cpumask_t cpus_with_pcps; ^~~~~~ vim +2024 mm/page_alloc.c 9f8f2172537de7 Christoph Lameter 2008-02-04 1996 9f8f2172537de7 Christoph Lameter 2008-02-04 1997 /* 74046494ea6867 Gilad Ben-Yossef 2012-03-28 1998 * Spill all the per-cpu pages from all CPUs back into the buddy allocator. 74046494ea6867 Gilad Ben-Yossef 2012-03-28 1999 * 93481ff0e5a0c7 Vlastimil Babka 2014-12-10 2000 * When zone parameter is non-NULL, spill just the single zone's pages. 93481ff0e5a0c7 Vlastimil Babka 2014-12-10 2001 * 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2002 * Note that this code is protected against sending an IPI to an offline 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2003 * CPU but does not guarantee sending an IPI to newly hotplugged CPUs: 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2004 * on_each_cpu_mask() blocks hotplug and won't talk to offlined CPUs but 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2005 * nothing keeps CPUs from showing up after we populated the cpumask and 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2006 * before the call to on_each_cpu_mask(). 9f8f2172537de7 Christoph Lameter 2008-02-04 2007 */ 93481ff0e5a0c7 Vlastimil Babka 2014-12-10 2008 void drain_all_pages(struct zone *zone) 9f8f2172537de7 Christoph Lameter 2008-02-04 2009 { 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2010 int cpu; 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2011 df82285ab4b974 Mel Gorman 2019-11-05 2012 /* df82285ab4b974 Mel Gorman 2019-11-05 2013 * The number of managed pages has changed due to the initialisation df82285ab4b974 Mel Gorman 2019-11-05 2014 * so the pcpu batch and high limits needs to be updated or the limits df82285ab4b974 Mel Gorman 2019-11-05 2015 * will be artificially small. df82285ab4b974 Mel Gorman 2019-11-05 2016 */ df82285ab4b974 Mel Gorman 2019-11-05 2017 for_each_populated_zone(zone) df82285ab4b974 Mel Gorman 2019-11-05 2018 zone_pcp_update(zone); df82285ab4b974 Mel Gorman 2019-11-05 2019 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2020 /* 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2021 * Allocate in the BSS so we wont require allocation in 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2022 * direct reclaim path for CONFIG_CPUMASK_OFFSTACK=y 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2023 */ 74046494ea6867 Gilad Ben-Yossef 2012-03-28 @2024 static cpumask_t cpus_with_pcps; 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2025 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2026 /* 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2027 * We don't care about racing with CPU hotplug event 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2028 * as offline notification will cause the notified 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2029 * cpu to drain that CPU pcps and on_each_cpu_mask 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2030 * disables preemption as part of its processing 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2031 */ 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2032 for_each_online_cpu(cpu) { 93481ff0e5a0c7 Vlastimil Babka 2014-12-10 2033 struct per_cpu_pageset *pcp; 93481ff0e5a0c7 Vlastimil Babka 2014-12-10 2034 struct zone *z; 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2035 bool has_pcps = false; 93481ff0e5a0c7 Vlastimil Babka 2014-12-10 2036 93481ff0e5a0c7 Vlastimil Babka 2014-12-10 2037 if (zone) { 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2038 pcp = per_cpu_ptr(zone->pageset, cpu); 93481ff0e5a0c7 Vlastimil Babka 2014-12-10 2039 if (pcp->pcp.count) 93481ff0e5a0c7 Vlastimil Babka 2014-12-10 2040 has_pcps = true; 93481ff0e5a0c7 Vlastimil Babka 2014-12-10 2041 } else { 93481ff0e5a0c7 Vlastimil Babka 2014-12-10 2042 for_each_populated_zone(z) { 93481ff0e5a0c7 Vlastimil Babka 2014-12-10 2043 pcp = per_cpu_ptr(z->pageset, cpu); 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2044 if (pcp->pcp.count) { 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2045 has_pcps = true; 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2046 break; 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2047 } 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2048 } 93481ff0e5a0c7 Vlastimil Babka 2014-12-10 2049 } 93481ff0e5a0c7 Vlastimil Babka 2014-12-10 2050 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2051 if (has_pcps) 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2052 cpumask_set_cpu(cpu, &cpus_with_pcps); 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2053 else 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2054 cpumask_clear_cpu(cpu, &cpus_with_pcps); 74046494ea6867 Gilad Ben-Yossef 2012-03-28 2055 } 93481ff0e5a0c7 Vlastimil Babka 2014-12-10 2056 on_each_cpu_mask(&cpus_with_pcps, (smp_call_func_t) drain_local_pages, 93481ff0e5a0c7 Vlastimil Babka 2014-12-10 2057 zone, 1); 9f8f2172537de7 Christoph Lameter 2008-02-04 2058 } 9f8f2172537de7 Christoph Lameter 2008-02-04 2059 :::::: The code at line 2024 was first introduced by commit :::::: 74046494ea68676d29ef6501a4bd950f08112a2c mm: only IPI CPUs to drain local pages if they exist :::::: TO: Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx> :::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx Intel Corporation
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