[v4,13/15] mm: stop zeroing memory during allocation in vmemmap

Replace allocators in sprase-vmemmap to use the non-zeroing version. So,
we will get the performance improvement by zeroing the memory in parallel
when struct pages are zeroed.

Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: Steven Sistare <steven.sistare@oracle.com>
Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Reviewed-by: Bob Picco <bob.picco@oracle.com>
---
 mm/sparse-vmemmap.c | 6 +++---
 mm/sparse.c         | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

Hi Pavel,

[auto build test ERROR on mmotm/master]
[also build test ERROR on v4.13-rc3]
[cannot apply to next-20170802]
[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/complete-deferred-page-initialization/20170803-081025
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: sh-allmodconfig (attached as .config)
compiler: sh4-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/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=sh 

All error/warnings (new ones prefixed by >>):

   mm/sparse.c: In function 'sparse_mem_maps_populate_node':
>> mm/sparse.c:444:8: error: implicit declaration of function 'memblock_virt_alloc_try_nid_raw' [-Werror=implicit-function-declaration]
     map = memblock_virt_alloc_try_nid_raw(size * map_count,
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> mm/sparse.c:444:6: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     map = memblock_virt_alloc_try_nid_raw(size * map_count,
         ^
   cc1: some warnings being treated as errors

vim +/memblock_virt_alloc_try_nid_raw +444 mm/sparse.c

   406	
   407	#ifndef CONFIG_SPARSEMEM_VMEMMAP
   408	struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid)
   409	{
   410		struct page *map;
   411		unsigned long size;
   412	
   413		map = alloc_remap(nid, sizeof(struct page) * PAGES_PER_SECTION);
   414		if (map)
   415			return map;
   416	
   417		size = PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION);
   418		map = memblock_virt_alloc_try_nid(size,
   419						  PAGE_SIZE, __pa(MAX_DMA_ADDRESS),
   420						  BOOTMEM_ALLOC_ACCESSIBLE, nid);
   421		return map;
   422	}
   423	void __init sparse_mem_maps_populate_node(struct page **map_map,
   424						  unsigned long pnum_begin,
   425						  unsigned long pnum_end,
   426						  unsigned long map_count, int nodeid)
   427	{
   428		void *map;
   429		unsigned long pnum;
   430		unsigned long size = sizeof(struct page) * PAGES_PER_SECTION;
   431	
   432		map = alloc_remap(nodeid, size * map_count);
   433		if (map) {
   434			for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
   435				if (!present_section_nr(pnum))
   436					continue;
   437				map_map[pnum] = map;
   438				map += size;
   439			}
   440			return;
   441		}
   442	
   443		size = PAGE_ALIGN(size);
 > 444		map = memblock_virt_alloc_try_nid_raw(size * map_count,
   445						      PAGE_SIZE, __pa(MAX_DMA_ADDRESS),
   446						      BOOTMEM_ALLOC_ACCESSIBLE, nodeid);
   447		if (map) {
   448			for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
   449				if (!present_section_nr(pnum))
   450					continue;
   451				map_map[pnum] = map;
   452				map += size;
   453			}
   454			return;
   455		}
   456	
   457		/* fallback */
   458		for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
   459			struct mem_section *ms;
   460	
   461			if (!present_section_nr(pnum))
   462				continue;
   463			map_map[pnum] = sparse_mem_map_populate(pnum, nodeid);
   464			if (map_map[pnum])
   465				continue;
   466			ms = __nr_to_section(pnum);
   467			pr_err("%s: sparsemem memory map backing failed some memory will not be available\n",
   468			       __func__);
   469			ms->section_mem_map = 0;
   470		}
   471	}
   472	#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
   473	

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