linux-kernel - Re: [PATCH 2/3] mm: add find_alloc_contig

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Date:   Tue, 17 Apr 2018 22:19:27 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     kbuild-all@...org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        Reinette Chatre <reinette.chatre@...el.com>,
        Michal Hocko <mhocko@...nel.org>,
        Christopher Lameter <cl@...ux.com>,
        Guy Shattah <sguy@...lanox.com>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        Michal Nazarewicz <mina86@...a86.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        David Nellans <dnellans@...dia.com>,
        Laura Abbott <labbott@...hat.com>, Pavel Machek <pavel@....cz>,
        Dave Hansen <dave.hansen@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: Re: [PATCH 2/3] mm: add find_alloc_contig_pages() interface

Hi Mike,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on mmotm/master]
[also build test ERROR on v4.17-rc1 next-20180417]
[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/Mike-Kravetz/mm-change-type-of-free_contig_range-nr_pages-to-unsigned-long/20180417-194309
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: sparc-defconfig (attached as .config)
compiler: sparc-linux-gcc (GCC) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=sparc 

All errors (new ones prefixed by >>):

   In file included from include/linux/slab.h:15:0,
                    from include/linux/irq.h:21,
                    from include/asm-generic/hardirq.h:13,
                    from arch/sparc/include/asm/hardirq_32.h:11,
                    from arch/sparc/include/asm/hardirq.h:7,
                    from include/linux/hardirq.h:9,
                    from include/linux/interrupt.h:11,
                    from include/linux/kernel_stat.h:9,
                    from arch/sparc/kernel/irq_32.c:15:
   include/linux/gfp.h:580:15: error: unknown type name 'page'
    static inline page *find_alloc_contig_pages(unsigned int order, gfp_t gfp,
                  ^~~~
>> include/linux/gfp.h:585:13: error: 'free_contig_pages' defined but not used [-Werror=unused-function]
    static void free_contig_pages(struct page *page, unsigned long nr_pages)
                ^~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors

vim +/free_contig_pages +585 include/linux/gfp.h

   570	
   571	#if (defined(CONFIG_MEMORY_ISOLATION) && defined(CONFIG_COMPACTION)) || defined(CONFIG_CMA)
   572	/* The below functions must be run on a range from a single zone. */
   573	extern int alloc_contig_range(unsigned long start, unsigned long end,
   574				      unsigned migratetype, gfp_t gfp_mask);
   575	extern void free_contig_range(unsigned long pfn, unsigned long nr_pages);
   576	extern struct page *find_alloc_contig_pages(unsigned int order, gfp_t gfp,
   577							int nid, nodemask_t *nodemask);
   578	extern void free_contig_pages(struct page *page, unsigned long nr_pages);
   579	#else
 > 580	static inline page *find_alloc_contig_pages(unsigned int order, gfp_t gfp,
   581							int nid, nodemask_t *nodemask)
   582	{
   583		return NULL;
   584	}
 > 585	static void free_contig_pages(struct page *page, unsigned long nr_pages)
   586	{
   587	}
   588	#endif
   589	

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