linux-kernel - Re: [PATCH v5 04/10] mm/memory_hotplug: Don't access uninitialized memmaps in shrink_zone

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Message-ID: <201910020708.08EwQH5l%lkp@intel.com>
Date:   Wed, 2 Oct 2019 07:47:21 +0800
From:   kbuild test robot <lkp@...el.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-arm-kernel@...ts.infradead.org,
        linux-ia64@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Oscar Salvador <osalvador@...e.de>,
        Michal Hocko <mhocko@...e.com>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Dan Williams <dan.j.williams@...el.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>
Subject: Re: [PATCH v5 04/10] mm/memory_hotplug: Don't access uninitialized
 memmaps in shrink_zone_span()

Hi David,

I love your patch! Yet something to improve:

[auto build test ERROR on mmotm/master]

url:    https://github.com/0day-ci/linux/commits/David-Hildenbrand/mm-memory_hotplug-Shrink-zones-before-removing-memory/20191002-054310
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: i386-randconfig-g004-201939 (attached as .config)
compiler: gcc-7 (Debian 7.4.0-13) 7.4.0
reproduce:
        # 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@...el.com>

All errors (new ones prefixed by >>):

   mm/memory_hotplug.c: In function '__remove_zone':
>> mm/memory_hotplug.c:471:24: error: 'ZONE_DEVICE' undeclared (first use in this function); did you mean 'ZONE_MOVABLE'?
     if (zone_idx(zone) == ZONE_DEVICE)
                           ^~~~~~~~~~~
                           ZONE_MOVABLE
   mm/memory_hotplug.c:471:24: note: each undeclared identifier is reported only once for each function it appears in

vim +471 mm/memory_hotplug.c

   459	
   460	static void __remove_zone(struct zone *zone, unsigned long start_pfn,
   461			unsigned long nr_pages)
   462	{
   463		struct pglist_data *pgdat = zone->zone_pgdat;
   464		unsigned long flags;
   465	
   466		/*
   467		 * Zone shrinking code cannot properly deal with ZONE_DEVICE. So
   468		 * we will not try to shrink the zones - which is okay as
   469		 * set_zone_contiguous() cannot deal with ZONE_DEVICE either way.
   470		 */
 > 471		if (zone_idx(zone) == ZONE_DEVICE)
   472			return;
   473	
   474		pgdat_resize_lock(zone->zone_pgdat, &flags);
   475		shrink_zone_span(zone, start_pfn, start_pfn + nr_pages);
   476		update_pgdat_span(pgdat);
   477		pgdat_resize_unlock(zone->zone_pgdat, &flags);
   478	}
   479	

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