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Date:   Thu, 26 Oct 2017 14:33:00 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Baoquan He <bhe@...hat.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        akpm@...ux-foundation.org, x86@...nel.org,
        Baoquan He <bhe@...hat.com>
Subject: Re: [PATCH] x86/mm/64: Rename the argument 'size' as 'nr_pages' in
 register_page_bootmem_memmap

Hi Baoquan,

[auto build test ERROR on tip/x86/core]
[also build test ERROR on v4.14-rc6 next-20171018]
[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/Baoquan-He/x86-mm-64-Rename-the-argument-size-as-nr_pages-in-register_page_bootmem_memmap/20171026-125956
config: x86_64-allyesconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   arch/x86//mm/init_64.c: In function 'register_page_bootmem_memmap':
>> arch/x86//mm/init_64.c:1341:15: error: 'nr_pages' redeclared as different kind of symbol
     unsigned int nr_pages;
                  ^~~~~~~~
   arch/x86//mm/init_64.c:1332:46: note: previous definition of 'nr_pages' was here
          struct page *start_page, unsigned long nr_pages)
                                                 ^~~~~~~~

vim +/nr_pages +1341 arch/x86//mm/init_64.c

c2b91e2ee Yinghai Lu         2008-04-12  1329  
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1330  #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HAVE_BOOTMEM_INFO_NODE)
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1331  void register_page_bootmem_memmap(unsigned long section_nr,
b5f7b7e8b Baoquan He         2017-10-24  1332  				  struct page *start_page, unsigned long nr_pages)
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1333  {
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1334  	unsigned long addr = (unsigned long)start_page;
b5f7b7e8b Baoquan He         2017-10-24  1335  	unsigned long end = (unsigned long)(start_page + nr_pages);
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1336  	unsigned long next;
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1337  	pgd_t *pgd;
f2a6a7050 Kirill A. Shutemov 2017-03-17  1338  	p4d_t *p4d;
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1339  	pud_t *pud;
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1340  	pmd_t *pmd;
46723bfa5 Yasuaki Ishimatsu  2013-02-22 @1341  	unsigned int nr_pages;
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1342  	struct page *page;
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1343  
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1344  	for (; addr < end; addr = next) {
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1345  		pte_t *pte = NULL;
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1346  
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1347  		pgd = pgd_offset_k(addr);
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1348  		if (pgd_none(*pgd)) {
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1349  			next = (addr + PAGE_SIZE) & PAGE_MASK;
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1350  			continue;
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1351  		}
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1352  		get_page_bootmem(section_nr, pgd_page(*pgd), MIX_SECTION_INFO);
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1353  
f2a6a7050 Kirill A. Shutemov 2017-03-17  1354  		p4d = p4d_offset(pgd, addr);
f2a6a7050 Kirill A. Shutemov 2017-03-17  1355  		if (p4d_none(*p4d)) {
f2a6a7050 Kirill A. Shutemov 2017-03-17  1356  			next = (addr + PAGE_SIZE) & PAGE_MASK;
f2a6a7050 Kirill A. Shutemov 2017-03-17  1357  			continue;
f2a6a7050 Kirill A. Shutemov 2017-03-17  1358  		}
f2a6a7050 Kirill A. Shutemov 2017-03-17  1359  		get_page_bootmem(section_nr, p4d_page(*p4d), MIX_SECTION_INFO);
f2a6a7050 Kirill A. Shutemov 2017-03-17  1360  
f2a6a7050 Kirill A. Shutemov 2017-03-17  1361  		pud = pud_offset(p4d, addr);
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1362  		if (pud_none(*pud)) {
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1363  			next = (addr + PAGE_SIZE) & PAGE_MASK;
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1364  			continue;
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1365  		}
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1366  		get_page_bootmem(section_nr, pud_page(*pud), MIX_SECTION_INFO);
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1367  
16bf92261 Borislav Petkov    2016-03-29  1368  		if (!boot_cpu_has(X86_FEATURE_PSE)) {
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1369  			next = (addr + PAGE_SIZE) & PAGE_MASK;
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1370  			pmd = pmd_offset(pud, addr);
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1371  			if (pmd_none(*pmd))
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1372  				continue;
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1373  			get_page_bootmem(section_nr, pmd_page(*pmd),
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1374  					 MIX_SECTION_INFO);
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1375  
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1376  			pte = pte_offset_kernel(pmd, addr);
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1377  			if (pte_none(*pte))
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1378  				continue;
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1379  			get_page_bootmem(section_nr, pte_page(*pte),
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1380  					 SECTION_INFO);
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1381  		} else {
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1382  			next = pmd_addr_end(addr, end);
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1383  
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1384  			pmd = pmd_offset(pud, addr);
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1385  			if (pmd_none(*pmd))
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1386  				continue;
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1387  
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1388  			nr_pages = 1 << (get_order(PMD_SIZE));
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1389  			page = pmd_page(*pmd);
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1390  			while (nr_pages--)
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1391  				get_page_bootmem(section_nr, page++,
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1392  						 SECTION_INFO);
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1393  		}
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1394  	}
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1395  }
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1396  #endif
46723bfa5 Yasuaki Ishimatsu  2013-02-22  1397  

:::::: The code at line 1341 was first introduced by commit
:::::: 46723bfa540f0a1e494476a1734d03626a0bd1e0 memory-hotplug: implement register_page_bootmem_info_section of sparse-vmemmap

:::::: TO: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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