From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6A66AC5519F for ; Fri, 20 Nov 2020 06:47:12 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id EDAE52222F for ; Fri, 20 Nov 2020 06:47:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=bytedance-com.20150623.gappssmtp.com header.i=@bytedance-com.20150623.gappssmtp.com header.b="lQtTc4p2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EDAE52222F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=bytedance.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 6F6BF6B007E; Fri, 20 Nov 2020 01:47:10 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 6CCA96B0080; Fri, 20 Nov 2020 01:47:10 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5E2516B0081; Fri, 20 Nov 2020 01:47:10 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0070.hostedemail.com [216.40.44.70]) by kanga.kvack.org (Postfix) with ESMTP id 273C76B007E for ; Fri, 20 Nov 2020 01:47:10 -0500 (EST) Received: from smtpin17.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id A4879180AD837 for ; Fri, 20 Nov 2020 06:47:09 +0000 (UTC) X-FDA: 77503864578.17.pain07_001129527349 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin17.hostedemail.com (Postfix) with ESMTP id 8CFCF180D0181 for ; Fri, 20 Nov 2020 06:47:09 +0000 (UTC) X-HE-Tag: pain07_001129527349 X-Filterd-Recvd-Size: 5321 Received: from mail-pg1-f193.google.com (mail-pg1-f193.google.com [209.85.215.193]) by imf16.hostedemail.com (Postfix) with ESMTP for ; Fri, 20 Nov 2020 06:47:09 +0000 (UTC) Received: by mail-pg1-f193.google.com with SMTP id q28so6504805pgk.1 for ; Thu, 19 Nov 2020 22:47:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=9VN22FTK/cp8gibu50+JlwycxClP9nhjODvnGGV4tug=; b=lQtTc4p2yBd1UOH2ODIo4IfUun/3YveKsroBrt/z05tHCQ7bizuXanOEqJk1Qjjutd utIgpzzvRhDMQ6v/t6lQVerFUuFfpWtu7NjhOTcfNxn2JdmEke2/UD1WxhMDXygCHzF3 b/hXHUxHWkm6lSBs1d9sc0tIDhhA2ndRN0NkdUh8caMOLwtchHRhhGN5UyShY8Wemd06 mjBE+2Pl3whNHKbLaFl0ukQ31HqaNNWzxH2cK4B5ZG6H5Hf0H/wqZ8x6TegDWiWypdMZ URFjKhezi7NvGxsfWLVNwd0rk+gsAUyGGSNL6NdCr8uz9+C0JSe/BzXZx+yFNfNtvGH3 jkdg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=9VN22FTK/cp8gibu50+JlwycxClP9nhjODvnGGV4tug=; b=VXspKdxhtkv50/FvKptdDmKpEiSlHI50ryrhZUxnbILIMZgyefGvVW8zYXeL98N9PJ rWjFsUKxRsC4z8s9hP6/k/PM0DDo4SFDFLR8pH8SOhjEsrtd3igKQen/ibbL0CC4UXmS KC0BeDn281EUsuyZDOinQg4rR8ehz/B8oTvX7WKfNDKI6enjG/QwFwvHquBcJDJbO708 H+qBcPbDY71MkFlekM70R0c+7QJyIw8QEjhRgl80QRQ3JIvwDF9KZth8kjBkLGO/+j6Y WuTV8OSIfr6iNy/OlQ5MJ4wEQ8peLI2zB1w9PKo8yhDuE8EBOl3W8J4jKYiE9eiB4hlo duvg== X-Gm-Message-State: AOAM531AlHEBw4bWa62YasQJNhNU1NI6AYSRn+f2vw3LpjEuAjw2/Kv3 3SmOhTEsMZtt7EMp4r/hjz7lSw== X-Google-Smtp-Source: ABdhPJxxy0AXK/uMW8d0jud0uccMRuTn/ZHVTN15mkHEhZy7MdQXjCEqDU31cygr5QSODMyZCgtrIQ== X-Received: by 2002:a17:90a:62c8:: with SMTP id k8mr8484104pjs.33.1605854827824; Thu, 19 Nov 2020 22:47:07 -0800 (PST) Received: from localhost.localdomain ([103.136.221.72]) by smtp.gmail.com with ESMTPSA id 23sm2220278pfx.210.2020.11.19.22.46.58 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 19 Nov 2020 22:47:07 -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, song.bao.hua@hisilicon.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 v5 06/21] mm/bootmem_info: Introduce {free,prepare}_vmemmap_page() Date: Fri, 20 Nov 2020 14:43:10 +0800 Message-Id: <20201120064325.34492-7-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20201120064325.34492-1-songmuchun@bytedance.com> References: <20201120064325.34492-1-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: In the later patch, we can use the free_vmemmap_page() to free the unused vmemmap pages and initialize a page for vmemmap page using via prepare_vmemmap_page(). Signed-off-by: Muchun Song --- include/linux/bootmem_info.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/include/linux/bootmem_info.h b/include/linux/bootmem_info.h index 4ed6dee1adc9..239e3cc8f86c 100644 --- a/include/linux/bootmem_info.h +++ b/include/linux/bootmem_info.h @@ -3,6 +3,7 @@ #define __LINUX_BOOTMEM_INFO_H =20 #include +#include =20 /* * Types for free bootmem stored in page->lru.next. These have to be in @@ -22,6 +23,29 @@ void __init register_page_bootmem_info_node(struct pgl= ist_data *pgdat); void get_page_bootmem(unsigned long info, struct page *page, unsigned long type); void put_page_bootmem(struct page *page); + +static inline void free_vmemmap_page(struct page *page) +{ + VM_WARN_ON(!PageReserved(page) || page_ref_count(page) !=3D 2); + + /* bootmem page has reserved flag in the reserve_bootmem_region */ + if (PageReserved(page)) { + unsigned long magic =3D (unsigned long)page->freelist; + + if (magic =3D=3D SECTION_INFO || magic =3D=3D MIX_SECTION_INFO) + put_page_bootmem(page); + else + WARN_ON(1); + } +} + +static inline void prepare_vmemmap_page(struct page *page) +{ + unsigned long section_nr =3D pfn_to_section_nr(page_to_pfn(page)); + + get_page_bootmem(section_nr, page, SECTION_INFO); + mark_page_reserved(page); +} #else static inline void register_page_bootmem_info_node(struct pglist_data *p= gdat) { --=20 2.11.0