From: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx> Subject: mm/sparse.c: use __nr_to_section(section_nr) to get mem_section __pfn_to_section is defined as __nr_to_section(pfn_to_section_nr(pfn)). Since we already get section_nr, it is not necessary to get mem_section from start_pfn. By doing so, we reduce one redundant operation. Link: http://lkml.kernel.org/r/20190809010242.29797-1-richardw.yang@xxxxxxxxxxxxxxx Signed-off-by: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx> Reviewed-by: Anshuman Khandual <anshuman.khandual@xxxxxxx> Tested-by: Anshuman Khandual <anshuman.khandual@xxxxxxx> Cc: Oscar Salvador <osalvador@xxxxxxx> Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxx> Cc: David Hildenbrand <david@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/sparse.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/sparse.c~mm-sparse-use-__nr_to_sectionsection_nr-to-get-mem_section +++ a/mm/sparse.c @@ -877,7 +877,7 @@ int __meminit sparse_add_section(int nid */ page_init_poison(pfn_to_page(start_pfn), sizeof(struct page) * nr_pages); - ms = __pfn_to_section(start_pfn); + ms = __nr_to_section(section_nr); set_section_nid(section_nr, nid); section_mark_present(ms); _
