Messages in this thread Patch in this message | | | From | Muchun Song <> | Subject | [PATCH v6 16/16] mm/hugetlb: Add BUILD_BUG_ON to catch invalid usage of tail struct page | Date | Tue, 24 Nov 2020 17:52:59 +0800 |
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There are only `RESERVE_VMEMMAP_SIZE / sizeof(struct page)` struct pages can be used when CONFIG_HUGETLB_PAGE_FREE_VMEMMAP, so add a BUILD_BUG_ON to catch this invalid usage of tail struct page.
Signed-off-by: Muchun Song <songmuchun@bytedance.com> --- mm/hugetlb_vmemmap.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c index b2222f8d1245..d2c013582110 100644 --- a/mm/hugetlb_vmemmap.c +++ b/mm/hugetlb_vmemmap.c @@ -338,6 +338,9 @@ void __init hugetlb_vmemmap_init(struct hstate *h) unsigned int order = huge_page_order(h); unsigned int vmemmap_pages; + BUILD_BUG_ON(NR_USED_SUBPAGE >= + RESERVE_VMEMMAP_SIZE / sizeof(struct page)); + if (!is_power_of_2(sizeof(struct page)) || !hugetlb_free_vmemmap_enabled) { pr_info("disable freeing vmemmap pages for %s\n", h->name); -- 2.11.0
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