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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 84402C433E0 for ; Sun, 10 Jan 2021 12:42:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4A46F2396F for ; Sun, 10 Jan 2021 12:42:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726551AbhAJMmO (ORCPT ); Sun, 10 Jan 2021 07:42:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46532 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726069AbhAJMmN (ORCPT ); Sun, 10 Jan 2021 07:42:13 -0500 Received: from mail-pl1-x631.google.com (mail-pl1-x631.google.com [IPv6:2607:f8b0:4864:20::631]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A622AC0617A2 for ; Sun, 10 Jan 2021 04:41:32 -0800 (PST) Received: by mail-pl1-x631.google.com with SMTP id x18so8061156pln.6 for ; Sun, 10 Jan 2021 04:41:32 -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=ffJDakXCDHXSBit9htKSivl1vC+lnq1/j37kP5/245Q=; b=cUxJC0PDgtphFqteTncK1MMWPA0tvaGir94in2c2J8OS1SoLVX445ms53I6WXgvgZt omcPb99wACh3cWgOjXnBmpbdfO6TGUoKvW5FkIAjWnK2WaGBlkaGuWe3fil1eko5nnNz 0fEHHF+vbssaLNNJZQ4OERgj1TxSq9doOTw9wn6N/E1c9kvgMXSW8khp42cxCiEKOYZc YIT82Ffe2Dm5QVfgBXtzGRcUq66thL3sVDK8CB/y+caCXc3MflE+iN6IsmWSE3r9Wr0Q dmMPD1A8lozfusvXZFMUOYroviV/u8043Bi2YD3mEM6yJnOAy79Fj1HAx7kIXVvsPX6M uFLg== 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=ffJDakXCDHXSBit9htKSivl1vC+lnq1/j37kP5/245Q=; b=iasonTx+AwY5fNIuSZOvydu9Ksga9BuTh16VIuki5Ty6MbQ7GmnJlyCukRfnVFs4Nh NtSmTREa/3wHP3MgoxBViLKsehsE8LAOMm8nhSM7kPBiz3JfeirFvsvCpM1UU6AE1k0D u6e8x4i6ta+Z0BZvxDvLQj7gjTXmQ9GsEvOwXpxK+dDh2mX27wt0qQJ31w1CaD+GNwRq BJMCARJoA2rCtNX2ZVmEXQwCW7Aa9iZhFolp8Ahjbw/Vh8ONqFL71intin7NNUcGJJIQ rvWZZclzRt5JoWljJMocsjyurwFvXvi4lcoyyGr83bN6t0CEePix+MpQ+KHahAaO6xwq CgAA== X-Gm-Message-State: AOAM531BvFDOkIW73BLxXsBK7VsaBFYJzDHNEnZCcKEL0WuXfS2Px93c 7/YI+JfL8lJSw9eWdoBYzRBhwuRxeqt3lqxNVWg= X-Google-Smtp-Source: ABdhPJyZ047vfaPcWkl/qH5UFf8rFpsGc+XXjNkX+M8hjJ33pepyB/KnD8+n6in94OwlD32paX1+4g== X-Received: by 2002:a17:902:b782:b029:dc:251:423f with SMTP id e2-20020a170902b782b02900dc0251423fmr12395450pls.30.1610282492291; Sun, 10 Jan 2021 04:41:32 -0800 (PST) Received: from localhost.localdomain ([139.177.225.247]) by smtp.gmail.com with ESMTPSA id p9sm16176960pfq.136.2021.01.10.04.41.28 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 10 Jan 2021 04:41:31 -0800 (PST) From: Muchun Song To: mike.kravetz@oracle.com, akpm@linux-foundation.org Cc: n-horiguchi@ah.jp.nec.com, ak@linux.intel.com, mhocko@suse.cz, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Muchun Song , stable@vger.kernel.org Subject: [PATCH v3 2/6] mm: hugetlbfs: fix cannot migrate the fallocated HugeTLB page Date: Sun, 10 Jan 2021 20:40:13 +0800 Message-Id: <20210110124017.86750-3-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20210110124017.86750-1-songmuchun@bytedance.com> References: <20210110124017.86750-1-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If a new hugetlb page is allocated during fallocate it will not be marked as active (set_page_huge_active) which will result in a later isolate_huge_page failure when the page migration code would like to move that page. Such a failure would be unexpected and wrong. Only export set_page_huge_active, just leave clear_page_huge_active as static. Because there are no external users. Fixes: 70c3547e36f5 (hugetlbfs: add hugetlbfs_fallocate()) Signed-off-by: Muchun Song Cc: stable@vger.kernel.org --- fs/hugetlbfs/inode.c | 3 ++- include/linux/hugetlb.h | 2 ++ mm/hugetlb.c | 2 +- 3 files changed, 5 insertions(+), 2 deletions(-) diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index b5c109703daa..21c20fd5f9ee 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -735,9 +735,10 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset, mutex_unlock(&hugetlb_fault_mutex_table[hash]); + set_page_huge_active(page); /* * unlock_page because locked by add_to_page_cache() - * page_put due to reference from alloc_huge_page() + * put_page() due to reference from alloc_huge_page() */ unlock_page(page); put_page(page); diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index ebca2ef02212..b5807f23caf8 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -770,6 +770,8 @@ static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma, } #endif +void set_page_huge_active(struct page *page); + #else /* CONFIG_HUGETLB_PAGE */ struct hstate {}; diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 1f3bf1710b66..4741d60f8955 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1348,7 +1348,7 @@ bool page_huge_active(struct page *page) } /* never called for tail page */ -static void set_page_huge_active(struct page *page) +void set_page_huge_active(struct page *page) { VM_BUG_ON_PAGE(!PageHeadHuge(page), page); SetPagePrivate(&page[1]); -- 2.11.0