Messages in this thread Patch in this message | | | From | Zi Yan <> | Subject | [RFC PATCH v2 05/12] mm: prevent pageblock size being larger than section size. | Date | Thu, 11 Aug 2022 19:16:36 -0400 |
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From: Zi Yan <ziy@nvidia.com>
Only physical pages from a section can be guaranteed to be contiguous and so far a pageblock can only group contiguous physical pages by design. Set pageblock_order properly to prevent pageblock going beyond section size.
Signed-off-by: Zi Yan <ziy@nvidia.com> Cc: Wei Yang <richard.weiyang@linux.alibaba.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org> Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org --- include/linux/pageblock-flags.h | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/include/linux/pageblock-flags.h b/include/linux/pageblock-flags.h index 358b871b07ca..2679b2b4c079 100644 --- a/include/linux/pageblock-flags.h +++ b/include/linux/pageblock-flags.h @@ -47,8 +47,11 @@ extern unsigned int pageblock_order; #else /* CONFIG_HUGETLB_PAGE */ -/* If huge pages are not used, group by MAX_ORDER_NR_PAGES */ -#define pageblock_order MAX_ORDER +/* + * If huge pages are not used, group by MAX_ORDER_NR_PAGES or + * PAGES_PER_SECTION when MAX_ORDER_NR_PAGES is larger. + */ +#define pageblock_order (min(PFN_SECTION_SHIFT, MAX_ORDER)) #endif /* CONFIG_HUGETLB_PAGE */ -- 2.35.1
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