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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>
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@ -424,6 +424,7 @@ static int __meminit online_page_ext(unsigned long start_pfn,
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return 0;
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/* rollback */
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end = pfn - PAGES_PER_SECTION;
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for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)
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__free_page_ext(pfn);
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