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Date: Mon, 26 Oct 2020 22:51:14 +0800 From: Muchun Song <songmuchun@...edance.com> To: corbet@....net, mike.kravetz@...cle.com, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org, hpa@...or.com, dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org, viro@...iv.linux.org.uk, akpm@...ux-foundation.org, paulmck@...nel.org, mchehab+huawei@...nel.org, pawan.kumar.gupta@...ux.intel.com, rdunlap@...radead.org, oneukum@...e.com, anshuman.khandual@....com, jroedel@...e.de, almasrymina@...gle.com, rientjes@...gle.com, willy@...radead.org Cc: duanxiongchun@...edance.com, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, linux-fsdevel@...r.kernel.org, Muchun Song <songmuchun@...edance.com> Subject: [PATCH v2 19/19] mm/hugetlb: Add BUILD_BUG_ON to catch invalid usage of tail struct page 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@...edance.com> --- mm/hugetlb.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 029b00ed52ed..b196373a2a39 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -3955,6 +3955,8 @@ static int __init hugetlb_init(void) #ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP BUILD_BUG_ON_NOT_POWER_OF_2(sizeof(struct page)); + BUILD_BUG_ON(NR_USED_SUBPAGE >= + RESERVE_VMEMMAP_SIZE / sizeof(struct page)); #endif if (!hugepages_supported()) { -- 2.20.1
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