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=-8.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 D2A76C12002 for ; Thu, 15 Jul 2021 02:52:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B7E6661358 for ; Thu, 15 Jul 2021 02:52:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230507AbhGOCzQ (ORCPT ); Wed, 14 Jul 2021 22:55:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34676 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230494AbhGOCzQ (ORCPT ); Wed, 14 Jul 2021 22:55:16 -0400 Received: from mail-pf1-x42e.google.com (mail-pf1-x42e.google.com [IPv6:2607:f8b0:4864:20::42e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EDFD1C06175F for ; Wed, 14 Jul 2021 19:52:23 -0700 (PDT) Received: by mail-pf1-x42e.google.com with SMTP id p22so3757481pfh.8 for ; Wed, 14 Jul 2021 19:52:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=dMC/7BJES1xsl6whxIikhxzC8Rq8hRd9OZiivLLNk5o=; b=wVWv2guCZsRL63EFpcEV44cSTV9blEjTw/yo7hgyxR635O9UVREcpt+T3FzX4Lluqs 9G7kDyCSSVj6iBRtHARWGMcpRXOO67gArpetvAoVUDNAwCc0X7fXV/FYFNk4h2qV6m8h Rl77vuZNfyFgqZ8+NucSgYQRhhsvVOOEHMixZRwsdM2gXDbNSHflX4NZ/evElDfxPTNw fQ/F/dwxnC+KU78EI5foaEWwwjSVMVXQhY2wGXsHoRBXVzLDNF6D6ta0tA9L7rmp9Y7V Mv2ayi8gIdpa3QNo3O+RZQMXpnyoYp5hXOYtXJ2V1VmTDMLNEl9V6AigG8qFVNbmsenW WOlw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=dMC/7BJES1xsl6whxIikhxzC8Rq8hRd9OZiivLLNk5o=; b=SSC60lJI6NsflMXh6dQrhwje4p8nSBYZfrMS47BtzbubXpTSKixoxhLMx7MoZLp022 77jZz1P2fNC6LZZ2lGuoyXoAOSS+PWC5mpomWGc+KoFTty/+gyobpkp1Tpi+o/p7VON0 l/v10uiwbTTn1CleI6kdsKgCAo6Sq+IDRbbyf1OR30wm6VAfi9cHxyn3nB6/hNFXoP/O 4pRhl8hgC4JFv0urgH9lfj5An52dZ7XEs46V8tk5bg7gpMiXfI/02SzTSicg3WK1CH6M w7G/RxwQENiNkfhNhnT5B2bTRTWpcKwRAdOp7Zkpw7QGnBPF+NQ2NLwqasQMXAiMfKUi /RvQ== X-Gm-Message-State: AOAM530ohKI2lZ2+JpV6KLwQh8S12McC2iSyGIFBxYQoeaXLYYvYuNqE d+q51YCg3a2sBy5KPF6fcH/2d4bO85vMDvjQwkJODA== X-Google-Smtp-Source: ABdhPJyCEpo9gLI9Iqz6IRgl/n5sGdxftzB8/eWvGjFyB3LPYbqUeTR0VczLI0dVPoOPiyANWeNQTYTcnqJBBlaPbr4= X-Received: by 2002:a63:5963:: with SMTP id j35mr1588664pgm.341.1626317543330; Wed, 14 Jul 2021 19:52:23 -0700 (PDT) MIME-Version: 1.0 References: <20210714193542.21857-1-joao.m.martins@oracle.com> <20210714193542.21857-2-joao.m.martins@oracle.com> In-Reply-To: <20210714193542.21857-2-joao.m.martins@oracle.com> From: Muchun Song Date: Thu, 15 Jul 2021 10:51:47 +0800 Message-ID: Subject: Re: [External] [PATCH v3 01/14] memory-failure: fetch compound_head after pgmap_pfn_valid() To: Joao Martins Cc: Linux Memory Management List , Dan Williams , Vishal Verma , Dave Jiang , Naoya Horiguchi , Matthew Wilcox , Jason Gunthorpe , John Hubbard , Jane Chu , Mike Kravetz , Andrew Morton , Jonathan Corbet , nvdimm@lists.linux.dev, linux-doc@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On Thu, Jul 15, 2021 at 3:36 AM Joao Martins wrote: > > memory_failure_dev_pagemap() at the moment assumes base pages (e.g. > dax_lock_page()). For pagemap with compound pages fetch the > compound_head in case a tail page memory failure is being handled. > > Currently this is a nop, but in the advent of compound pages in > dev_pagemap it allows memory_failure_dev_pagemap() to keep working. > > Reported-by: Jane Chu > Signed-off-by: Joao Martins > Reviewed-by: Naoya Horiguchi Reviewed-by: Muchun Song