linux-kernel - Re: [PATCH v2 1/1] mm: initialize pages on demand during boot

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Date:   Sat, 10 Feb 2018 13:24:15 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Pavel Tatashin <pasha.tatashin@...cle.com>
Cc:     kbuild-all@...org, steven.sistare@...cle.com,
        daniel.m.jordan@...cle.com, pasha.tatashin@...cle.com,
        m.mizuma@...fujitsu.com, akpm@...ux-foundation.org,
        mhocko@...e.com, catalin.marinas@....com,
        takahiro.akashi@...aro.org, gi-oh.kim@...fitbricks.com,
        heiko.carstens@...ibm.com, baiyaowei@...s.chinamobile.com,
        richard.weiyang@...il.com, paul.burton@...s.com,
        miles.chen@...iatek.com, vbabka@...e.cz, mgorman@...e.de,
        hannes@...xchg.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH v2 1/1] mm: initialize pages on demand during boot

Hi Pavel,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on mmotm/master]
[also build test ERROR on next-20180209]
[cannot apply to v4.15]
[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/Pavel-Tatashin/mm-initialize-pages-on-demand-during-boot/20180210-125104
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: x86_64-randconfig-x017-201805 (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=x86_64 

All errors (new ones prefixed by >>):

   mm/page_alloc.c: In function 'deferred_grow_zone':
>> mm/page_alloc.c:1590:18: error: 'struct zone' has no member named 'node'; did you mean 'name'?
     int nid = zone->node;
                     ^~~~
                     name

vim +1590 mm/page_alloc.c

  1578	
  1579	/*
  1580	 * If this zone has deferred pages, try to grow it by initializing enough
  1581	 * deferred pages to satisfy the allocation specified by order, rounded up to
  1582	 * the nearest PAGES_PER_SECTION boundary.  So we're adding memory in increments
  1583	 * of SECTION_SIZE bytes by initializing struct pages in increments of
  1584	 * PAGES_PER_SECTION * sizeof(struct page) bytes.
  1585	 */
  1586	static noinline bool __init
  1587	deferred_grow_zone(struct zone *zone, unsigned int order)
  1588	{
  1589		int zid = zone_idx(zone);
> 1590		int nid = zone->node;
  1591		pg_data_t *pgdat = NODE_DATA(nid);
  1592		unsigned long nr_pages_needed = ALIGN(1 << order, PAGES_PER_SECTION);
  1593		unsigned long nr_pages = 0;
  1594		unsigned long first_init_pfn, first_deferred_pfn, spfn, epfn, t;
  1595		phys_addr_t spa, epa;
  1596		u64 i;
  1597	
  1598		/* Only the last zone may have deferred pages */
  1599		if (zone_end_pfn(zone) != pgdat_end_pfn(pgdat))
  1600			return false;
  1601	
  1602		first_deferred_pfn = READ_ONCE(pgdat->first_deferred_pfn);
  1603		first_init_pfn = max(zone->zone_start_pfn, first_deferred_pfn);
  1604	
  1605		if (first_init_pfn >= pgdat_end_pfn(pgdat))
  1606			return false;
  1607	
  1608		spin_lock(&deferred_zone_grow_lock);
  1609		/*
  1610		 * Bail if we raced with another thread that disabled on demand
  1611		 * initialization.
  1612		 */
  1613		if (!static_branch_unlikely(&deferred_pages)) {
  1614			spin_unlock(&deferred_zone_grow_lock);
  1615			return false;
  1616		}
  1617	
  1618		for_each_free_mem_range(i, nid, MEMBLOCK_NONE, &spa, &epa, NULL) {
  1619			spfn = max_t(unsigned long, first_init_pfn, PFN_UP(spa));
  1620			epfn = min_t(unsigned long, zone_end_pfn(zone), PFN_DOWN(epa));
  1621	
  1622			while (spfn < epfn && nr_pages < nr_pages_needed) {
  1623				t = ALIGN(spfn + PAGES_PER_SECTION, PAGES_PER_SECTION);
  1624				first_deferred_pfn = min(t, epfn);
  1625				nr_pages += deferred_init_pages(nid, zid, spfn,
  1626								first_deferred_pfn);
  1627				spfn = first_deferred_pfn;
  1628			}
  1629	
  1630			if (nr_pages >= nr_pages_needed)
  1631				break;
  1632		}
  1633	
  1634		for_each_free_mem_range(i, nid, MEMBLOCK_NONE, &spa, &epa, NULL) {
  1635			spfn = max_t(unsigned long, first_init_pfn, PFN_UP(spa));
  1636			epfn = min_t(unsigned long, first_deferred_pfn, PFN_DOWN(epa));
  1637			deferred_free_pages(nid, zid, spfn, epfn);
  1638	
  1639			if (first_deferred_pfn == epfn)
  1640				break;
  1641		}
  1642		WRITE_ONCE(pgdat->first_deferred_pfn, first_deferred_pfn);
  1643		spin_unlock(&deferred_zone_grow_lock);
  1644	
  1645		return nr_pages >= nr_pages_needed;
  1646	}
  1647	

---
0-DAY kernel test infrastructure                Open Source Technology Center
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