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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 <shikemeng@huaweicloud.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kemeng Shi 2023-07-14 19:47:48 +08:00 committed by Andrew Morton
parent 063ff7cd8b
commit 3c09be5a2b
1 changed files with 1 additions and 0 deletions
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mm/page_ext.c
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@ -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);