Right now, we would free the extended page data if parts of a section are offlined or if onlining is aborted, although still some pages are online. We can simply check if the section is online to see if we are allowed to free. init_section_page_ext() already takes care of the allocation part for sub sections. Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxx> Cc: Vlastimil Babka <vbabka@xxxxxxx> Cc: Oscar Salvador <osalvador@xxxxxxxxxxxxxxxxxx> Cc: Kate Stewart <kstewart@xxxxxxxxxxxxxxxxxxx> Cc: Jaewon Kim <jaewon31.kim@xxxxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: David Hildenbrand <david@xxxxxxxxxx> --- mm/page_ext.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/mm/page_ext.c b/mm/page_ext.c index 5295ef331165..71a025128dac 100644 --- a/mm/page_ext.c +++ b/mm/page_ext.c @@ -320,7 +320,9 @@ static int __meminit online_page_ext(unsigned long start_pfn, /* rollback */ for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) - __free_page_ext(pfn); + /* still online? nothing to do then */ + if (!online_section_nr(pfn_to_section_nr(pfn))) + __free_page_ext(pfn); return -ENOMEM; } @@ -334,7 +336,10 @@ static int __meminit offline_page_ext(unsigned long start_pfn, end = SECTION_ALIGN_UP(start_pfn + nr_pages); for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) - __free_page_ext(pfn); + /* still online? nothing to do then */ + if (!online_section_nr(pfn_to_section_nr(pfn))) + __free_page_ext(pfn); + return 0; } -- 2.17.0
