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Fri, 13 Nov 2020 03:04:56 -0800 (PST) From: Muchun Song To: corbet@lwn.net, mike.kravetz@oracle.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, viro@zeniv.linux.org.uk, akpm@linux-foundation.org, paulmck@kernel.org, mchehab+huawei@kernel.org, pawan.kumar.gupta@linux.intel.com, rdunlap@infradead.org, oneukum@suse.com, anshuman.khandual@arm.com, jroedel@suse.de, almasrymina@google.com, rientjes@google.com, willy@infradead.org, osalvador@suse.de, mhocko@suse.com Cc: duanxiongchun@bytedance.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Muchun Song Subject: [PATCH v4 21/21] mm/hugetlb: Disable freeing vmemmap if struct page size is not power of two Date: Fri, 13 Nov 2020 18:59:52 +0800 Message-Id: <20201113105952.11638-22-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20201113105952.11638-1-songmuchun@bytedance.com> References: <20201113105952.11638-1-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 --- 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 f67aec6e3bb1..a0a5df9dba6b 100644 --- a/mm/hugetlb_vmemmap.c +++ b/mm/hugetlb_vmemmap.c @@ -635,7 +635,8 @@ void __init hugetlb_vmemmap_init(struct hstate *h) unsigned int order =3D huge_page_order(h); unsigned int vmemmap_pages; =20 - if (hugetlb_free_vmemmap_disabled) { + if (hugetlb_free_vmemmap_disabled || + !is_power_of_2(sizeof(struct page))) { h->nr_free_vmemmap_pages =3D 0; pr_info("disable free vmemmap pages for %s\n", h->name); return; --=20 2.11.0