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Date: Fri, 20 Nov 2020 14:43:25 +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, osalvador@...e.de, mhocko@...e.com, song.bao.hua@...ilicon.com 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 v5 21/21] mm/hugetlb: Disable freeing vmemmap if struct page size is not power of two We only can free the unused vmemmap to the buddy system when the size of struct page is a power of two. Signed-off-by: Muchun Song <songmuchun@...edance.com> --- mm/hugetlb_vmemmap.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c index c3b3fc041903..7bb749a3eea2 100644 --- a/mm/hugetlb_vmemmap.c +++ b/mm/hugetlb_vmemmap.c @@ -671,7 +671,8 @@ void __init hugetlb_vmemmap_init(struct hstate *h) unsigned int order = huge_page_order(h); unsigned int vmemmap_pages; - if (hugetlb_free_vmemmap_disabled) { + if (hugetlb_free_vmemmap_disabled || + !is_power_of_2(sizeof(struct page))) { pr_info("disable free vmemmap pages for %s\n", h->name); return; } -- 2.11.0
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