On Fri, Aug 09, 2019 at 02:39:59PM +0530, Anshuman Khandual wrote: > > >On 08/09/2019 06:32 AM, Wei Yang wrote: >> __pfn_to_section is defined as __nr_to_section(pfn_to_section_nr(pfn)). > >Right. > >> >> 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. >> >> Signed-off-by: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx> > >Looks right. > >With this applied, memory hot add still works on arm64. Thanks for your test. > >Reviewed-by: Anshuman Khandual <anshuman.khandual@xxxxxxx> > >> --- >> mm/sparse.c | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/mm/sparse.c b/mm/sparse.c >> index 72f010d9bff5..95158a148cd1 100644 >> --- a/mm/sparse.c >> +++ b/mm/sparse.c >> @@ -867,7 +867,7 @@ int __meminit sparse_add_section(int nid, unsigned long start_pfn, >> */ >> 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); >> >> -- Wei Yang Help you, Help me
