From 3c09be5a2be861d7f74b0251a8e77859b4c654cc Mon Sep 17 00:00:00 2001 From: Kemeng Shi Date: Fri, 14 Jul 2023 19:47:48 +0800 Subject: mm/page_ext: remove rollback for untouched mem_section in online_page_ext If init_section_page_ext failed, we only need rollback for mem_section before failed mem_section. Make rollback end point to failed mem_section to remove unnecessary rollback. As pfn += PAGES_PER_SECTION will be executed even if init_section_page_ext failed. So pfn points to mem_section after failed mem_section. Subtract one mem_section from pfn to get failed mem_section. Link: https://lkml.kernel.org/r/20230714114749.1743032-3-shikemeng@huaweicloud.com Signed-off-by: Kemeng Shi Cc: Joonsoo Kim Signed-off-by: Andrew Morton --- mm/page_ext.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/page_ext.c b/mm/page_ext.c index 096451df1c87..f052397dc70f 100644 --- a/mm/page_ext.c +++ b/mm/page_ext.c @@ -424,6 +424,7 @@ static int __meminit online_page_ext(unsigned long start_pfn, return 0; /* rollback */ + end = pfn - PAGES_PER_SECTION; for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) __free_page_ext(pfn); -- cgit v1.2.3